MysteryTwister C3
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Four levels

Four levels of increasing difficulty: From pen & paper to complex mathematical problems.

Limited attempts

You have only a limited number of attempts to solve each challenge. Be certain of your answer before you submit it.

Be fast

Be fast and earn a place on the Hall of Fame. The first four to solve each challenge will be displayed permanently.

Special Level X

The special level X contains cryptographic problems which are currently not known to have been solved.



Cipher challenges on four levels

 

Level I crypto challenges

Level I Challenges - Pen & Paper

Level I challenges are similar to crossword puzzles from newspapers and can be solved with little cryptographic background. You might not even need a computer for solving level I challenges — all you need is a bit of clever thinking and probably a pen and paper. A program like CrypTool applied to a level I challenge can help reveal the answer within minutes or even seconds, if the necessary algorithms are already built in. Hence, if you are new to cryptography, but nonetheless interested in the mysterious topic of cryptanalysis, give the level I challenges a try. You will almost assuredly meet quickly with success.
 
Level II crypto challenges

Level II Challenges - Programming skills required

Level II challenges require some background knowledge in cryptology and usually some computational power. Additionally, you may require tools that are not available in such convenient packages like CrypTool, OpenSSL or Sage. Therefore, you must first thoroughly understand the problem in order to write a computer program, which helps you getting along. It could take hours or even days to solve a level II challenge. Hence, if you consider yourself well-armed with cryptologic knowledge (such as if you are a university student in a cryptographic course), give the level II challenges a try. Success may not come easily, but it will be a worthwhile endeavor.
 
Level III crypto challenges

Level III Challenges - Extensive computing power recommended

Level III challenges require a thorough background in cryptanalysis and usually significant computational power as well. The problems in this level represent current research topics that are believed to be very difficult to solve. Thus, practical solutions may not even exist and ready-to-run tools almost certainly do not. The methodology to solve some of these challenges may already be known, but it may require such a huge amount of computational power that only a large group of people working together in a distributed system could obtain the solution. Challenges in this category mark the thin line between algorithms that are still secure and those that are not. Solving them may take weeks or even several months. Hence, challenges in this level are intended for entire research groups with many experts in cryptanalysis, programming, and distributed systems. Success cannot be guaranteed, but if you are the first to successfully solve one of these challenges, it probably would catch the attention of the scientific community. Of course, it still remains up to you to publish or present any such scientific techniques and results.
 
Level X crypto challenges

Level X Challenges - Unsolved ciphers

Most level X challenges contain problems that have remained unsolved for a long time. The fact that they have been unsolved regardless of numerous attempts suggests these challenges being hard. However, a simple idea can probably reduce the difficulty of it to a simple level I challenge — currently it is just unknown if and how they can be solved. Of course such a challenge cannot be solved with a simple codeword, since even we (the respective author and the MTC3 team) do not know the solution (the plaintext, the original message or the approach). So if you discover a promising solution you should either contact the author or the MTC3 team. Furthermore, you can publish your findings in a scientific journal such as Cryptologia or Journal of Cryptology.

 

Additionally, you may require tools that are not available in a convenient package like CrypTool.


All Challenges (267)

Ordered by date posted, the most recent appear first.

Number Sequence — Part 3

[edissmith-01] - 736 users already solved this challenge, 77 are working on it.
 
 
 

This number sequence is cyclic. Can you find out the fifth and sixth number?
Read more...

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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2012-03-30 22:49
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#736) Achieved points (Global score) y-m-d - h:m:s

J. M. (jomandi) 200 (113270) 2012-03-30 23:43:31
Viktor (Veselovský) 200 (134627) 2012-03-30 23:56:03
The Killer (Killer) 200 (42393) 2012-03-31 01:05:55
Seth Kintigh (DarkFibre) 200 (79471) 2012-03-31 07:13:14
#5 Roland Jansen (roland) 200 (17607) 2012-03-31 08:06:54
#6 Luigi Tomelli (archstanton) 200 (106685) 2012-03-31 09:22:29
#7 Armin Krauss (argh) 200 (171390) 2012-03-31 09:40:42
#8 Hans Peter (hanspeter) 200 (52256) 2012-03-31 10:54:13
#9 Thomas Lambert (lambert) 200 (38594) 2012-03-31 11:15:12
#10 dbuq (dbuq) 200 (22762) 2012-03-31 19:28:52
#11 Ulrich Dorobeck (Papageno) 200 (3624) 2012-03-31 20:35:51
#12 David (aki321) 150 (27482) 2012-03-31 23:27:34
#13 Bart den Hartog (Bart13) 150 (118984) 2012-04-01 01:37:04
#14 Michael Möller (michaelm) 150 (167404) 2012-04-01 18:19:03
#15 j.h. (haegarq) 133 (15252) 2012-04-02 12:58:23
#16 Christof Kleber (Loki) 133 (6051) 2012-04-02 14:08:44
#17 Ari Don (oregano87) 125 (125) 2012-04-02 22:51:22
#18 Christian von Mach (cvm) 125 (726) 2012-04-03 01:29:41
#19 River (Edis-Smith) 125 (225) 2012-04-03 11:44:44
#20 George (Theofanidis) 125 (101521) 2012-04-03 14:12:16
#21 Nathan (Witten) 125 (25326) 2012-04-03 20:48:13
#22 bubba gump (surrenderyourworld) 117 (925) 2012-04-05 03:04:10
#23 qwwblddn (qwwblddn) 117 (317) 2012-04-05 03:50:51
#24 Nikolas Mel (nikolas.asteri) 117 (117) 2012-04-05 13:05:35
#25 E.T (Ertheb) 117 (70149) 2012-04-05 17:46:53
#26 Jason Ribeiro (jrib) 117 (317) 2012-04-05 19:50:05
#27 Eric F (VikingFenn) 117 (317) 2012-04-05 21:45:43
#28 David Bruce (d4vidbruce) 113 (513) 2012-04-07 16:40:01
#29 Kevin (0xf0unD) 111 (217) 2012-04-08 00:02:38
#30 Wouter Kerkhoven (wkerkhoven) 111 (511) 2012-04-08 00:12:50
#31 Dustin Smith (dvst1n) 110 (415) 2012-04-09 19:19:36
#32 Kurt Gebauer (Yokozuna) 108 (142278) 2012-04-11 16:34:30
#33 Steluta P. (maty_star) 108 (5734) 2012-04-11 23:52:46
#34 Wombat (Wombat) 108 (5822) 2012-04-12 08:38:44
#35 H. Lautenschlager (helmi) 108 (29022) 2012-04-12 11:18:43
#36 Thomas Gonda (TomG) 108 (36291) 2012-04-12 13:03:42
#37 Aliazer (Aliazer) 108 (12314) 2012-04-12 13:23:10
#38 Roxana Ioana (rock_sana) 107 (610) 2012-04-13 13:31:58
#39 Saurabh (saurabheights) 107 (610) 2012-04-14 18:03:11
#40 Sean Atkinson (Seanwatkinson) 106 (410) 2012-04-16 02:38:36
#41 Susanne Lenzen (casanovari) 106 (507) 2012-04-16 23:35:05
#42 James Connelly (jconnelly) 105 (505) 2012-04-17 23:47:13
#43 Torsten Weiß (vice) 105 (406) 2012-04-20 10:21:10
#44 Fabian Bendun (benfa) 104 (8697) 2012-04-23 15:27:54
#45 mannone (didier) 104 (1559) 2012-04-23 20:26:49
#46 Benjamin Skrehot (BennySkr) 104 (409) 2012-04-26 23:01:56
#47 Daniel Demmler (dd23) 103 (8942) 2012-04-28 16:52:55
#48 Henning Wolter (alanduring) 103 (833) 2012-04-28 17:52:45
#49 Matthias Brand (cyberwoozle) 103 (1896) 2012-04-29 00:08:14
#50 Michael D'Errico (mike89145) 103 (512) 2012-04-29 06:53:48
#51 captp (bdcht) 103 (5864) 2012-04-30 00:23:19
#52 donationcoder (donationcoder) 103 (510) 2012-05-03 13:51:56
#53 M. W. (Epicure87) 103 (409) 2012-05-04 16:30:17
#54 Dinesh Patil (dineshpatil) 103 (309) 2012-05-06 01:47:32
#55 Michel Van Caneghem (vancan) 103 (49719) 2012-05-06 17:00:24
#56 Uli Dulli (Uli Dulli) 103 (1408) 2012-05-07 23:22:03
#57 Hans Rudolf (mutabor) 103 (3015) 2012-05-08 22:05:20
#58 p3rince (p3rince) 102 (502) 2012-05-12 12:32:50
#59 Albert Puigsech (apuigsech) 102 (302) 2012-05-12 16:08:57
#60 Annie (Annanasss) 102 (6813) 2012-05-14 14:32:42
#61 Jay Kay (Merty) 102 (3726) 2012-05-23 15:19:17
#62 Maciej (makhan) 102 (302) 2012-05-25 08:31:50
#63 Vladislav Grinko (minorkin) 102 (505) 2012-05-25 16:07:33
#64 KapitanKuhl (KapitanKuhl) 102 (504) 2012-06-03 19:38:25
#65 zuben c3 (zuben-c3) 102 (23853) 2012-06-04 20:33:51
#66 Daniel Richter (TheHiveMind) 102 (11147) 2012-06-04 22:07:25
#67 Bernd Klimaschewski (cryptonoob) 101 (1003) 2012-06-05 20:11:17
#68 chris_3stones (3stones) 101 (37759) 2012-06-10 12:35:25
#69 Daniel Wedlund (mounte) 101 (503) 2012-06-13 18:21:53
#70 Steven Bi (chenhsi) 101 (1305) 2012-06-14 19:41:40
#71 aaa dummy (aaadummy) 101 (1903) 2012-06-15 12:05:41
#72 mike (zakrf) 101 (203) 2012-06-15 12:32:30
#73 Chris V. (Kiki123987) 101 (601) 2012-06-16 18:56:35
#74 Dirk Tischer (nev2k) 101 (303) 2012-06-18 09:57:00
#75 John Willemse (Melting Brains) 101 (1316) 2012-06-18 15:49:01
#76 masam (jimboo) 101 (18687) 2012-06-18 17:39:36
#77 anjana e (anjanaegirish) 101 (503) 2012-06-22 07:16:37
#78 Dilna (dilnavv) 101 (503) 2012-06-22 14:52:40
#79 Ralf Stephan (rwst) 101 (22735) 2012-06-23 09:57:41
#80 Peter Griffin (PetG) 101 (302) 2012-06-25 09:37:53
#81 Andreas (androediger) 101 (301) 2012-06-25 09:46:21
#82 John Simon (aquadraht) 101 (802) 2012-06-28 10:45:56
#83 Sebastian Slupina (Grandwizard) 101 (10264) 2012-07-11 23:09:45
#84 monteverdi (yk) 101 (601) 2012-07-14 17:11:02
#85 Paul (Brenko) 101 (702) 2012-07-14 19:43:05
#86 Sebastian Mederle (Thistle) 101 (1202) 2012-07-17 15:49:46
#87 c0nt3stant (c0nt3stant) 101 (602) 2012-07-18 12:52:58
#88 Martin A. (hiety) 101 (418) 2012-07-22 15:09:29
#89 Stepan (m1sterx) 101 (19165) 2012-07-23 13:20:18
#90 Andrés Ceballos (andceb) 101 (314) 2012-07-24 18:55:55
#91 Yi Shing (ME =]) 101 (613) 2012-07-25 03:50:43
#92 Kyra Chong (kcshsid) 101 (613) 2012-07-25 03:52:01
#93 Answer (Answer) 101 (704) 2012-07-25 05:18:20
#94 George Ho (GeorgH) 101 (3095) 2012-07-26 10:01:49
#95 neelima (neelima) 101 (402) 2012-07-26 15:25:57
#96 andrew (andrew880) 101 (402) 2012-07-27 04:45:06
#97 David (Neereus) 101 (1420) 2012-07-31 08:29:51
#98 ror (ror) 101 (502) 2012-07-31 16:22:12
#99 Jani (mathpseudo) 101 (402) 2012-08-01 13:32:38
#100 Em Doulgerakis (Greko) 101 (124033) 2012-08-07 09:30:14
#101 Max (131x) 101 (1659) 2012-08-08 00:29:43
#102 Maximilian T (LMax) 101 (1903) 2012-08-08 13:47:02
#103 Andrew (god) 101 (501) 2012-08-16 09:25:42
#104 Peter Mustermann (Gummiboot) 101 (60285) 2012-08-16 18:33:49
#105 Hank (hanky) 101 (22859) 2012-08-26 17:36:07
#106 Lukas Juhrich (ljuhrich) 101 (5453) 2012-08-28 10:09:42
#107 Jan Knap (maddoxik) 101 (2458) 2012-09-01 03:28:21
#108 vas (pet) 101 (8197) 2012-09-01 13:51:17
#109 fergus (fergus) 101 (1944) 2012-09-04 11:13:29
#110 Thomas Mattel (Tom) 101 (2462) 2012-09-07 21:16:18
#111 $0wm7@ (haku) 101 (1643) 2012-09-13 15:51:40
#112 None (walruscode) 101 (401) 2012-09-15 01:33:44
#113 Fjodor Karamasow (Fjodor) 101 (3326) 2012-09-20 07:54:44
#114 Hannes (Hartmann) 101 (8680) 2012-09-20 20:20:10
#115 Benny (Kingombo) 101 (3663) 2012-09-23 01:41:07
#116 Martin (Dinu) 101 (707) 2012-09-23 19:46:09
#117 Martina (Nikita) 101 (3863) 2012-09-24 20:48:30
#118 Patrick Renz (tarantulla) 101 (2027) 2012-09-27 10:58:08
#119 tuighin (tuighi) 101 (609) 2012-09-27 19:42:30
#120 Urs Gysler (Sansibar) 101 (3269) 2012-10-01 20:17:17
#121 J Br (j.br) 101 (3242) 2012-10-04 15:09:22
#122 Markus Simon (Chara) 101 (804) 2012-10-04 21:33:49
#123 Harry (Schwabenbambi) 101 (2409) 2012-10-13 16:34:12
#124 Tomasz Wegrzanowski (taw) 101 (902) 2012-10-14 09:28:14
#125 Dave (aenigma) 101 (502) 2012-10-15 17:25:45
#126 Christian (md6) 101 (1404) 2012-10-15 17:33:16
#127 Mandar (m4nd4r) 101 (302) 2012-10-16 07:09:13
#128 Alexander Dockhorn (Descartes) 100 (1200) 2012-10-25 13:14:23
#129 wjm (wjm) 100 (300) 2012-10-25 15:35:26
#130 Hannes Nötzli (Faust) 100 (4781) 2012-10-27 22:37:46
#131 KW (qwer*) 100 (13963) 2012-10-29 21:26:03
#132 Daniel-Eike Hardt (hardt) 100 (401) 2012-11-01 20:51:38
#133 pu (Radu) 100 (300) 2012-11-01 21:17:20
#134 The Enigma (enigma) 100 (14336) 2012-11-03 23:05:38
#135 Eugene (ZhekaS) 100 (6037) 2012-11-07 14:15:02
#136 Sebastian Steinmann (teodoc) 100 (5594) 2012-11-11 01:30:21
#137 Roger Crews (rogerbrandon) 100 (3588) 2012-11-11 08:23:21
#138 Julia Werdelmann (jw) 100 (10407) 2012-11-11 13:38:01
#139 gromone (gromone) 100 (501) 2012-11-11 19:26:14
#140 Horst Kevin (lordstege) 100 (1419) 2012-11-12 14:00:59
#141 Pierre Robier (tripleedged) 100 (1605) 2012-11-14 22:44:13
#142 Andrew (Agromania) 100 (4508) 2012-11-15 07:58:58
#143 Ajay (NeoAj) 100 (400) 2012-11-16 15:49:30
#144 Ricardo Oliveira Souza (ricardooliveirasouza) 100 (1101) 2012-11-17 01:43:30
#145 Anggia (Vuleedazula) 100 (1608) 2012-11-19 11:17:25
#146 Raphaël (Yahoo51) 100 (901) 2012-11-21 22:39:58
#147 Chilly Willy (v_bk) 100 (400) 2012-11-23 08:30:44
#148 Steven (road_runner31) 100 (1774) 2012-11-28 11:53:39
#149 Laura (Weltenwandlerin) 100 (1004) 2012-12-03 17:28:59
#150 Jan Temme (JaT3) 100 (11694) 2012-12-09 03:59:25
#151 Leo (leo) 100 (500) 2012-12-09 12:03:32
#152 Gary Lee (garylee) 100 (2171) 2012-12-09 14:23:57
#153 cls (cls) 100 (400) 2012-12-14 14:44:47
#154 Elisa (eli) 100 (400) 2012-12-19 20:12:22
#155 Qinncade (Qinncade) 100 (2610) 2012-12-20 13:13:37
#156 Crichton (Crichton) 100 (803) 2012-12-24 07:21:19
#157 Camille (Kam139) 100 (2642) 2012-12-29 00:20:32
#158 J (j1m9) 100 (2180) 2013-01-01 02:41:25
#159 Roger (gonix) 100 (901) 2013-01-01 13:36:35
#160 Joe R (iceclown) 100 (2272) 2013-01-09 17:27:15
#161 Thomas Hahn (4OsoCg31XYcO) 100 (1703) 2013-01-09 23:31:25
#162 kevin shaw (steggily) 100 (2298) 2013-01-17 09:14:12
#163 Iain Sharp (WoodenHedgehog) 100 (2196) 2013-01-18 10:34:19
#164 Jason Chen (jchen76201) 100 (600) 2013-01-23 06:04:05
#165 Dikshant (chalisgaonkachintu) 100 (504) 2013-01-25 14:39:43
#166 Sankalp Ghatpande (Deadlyelder) 100 (1637) 2013-01-26 02:24:11
#167 Snake (snk) 100 (67306) 2013-01-28 15:46:19
#168 Daniel Hofer (Dada963) 100 (1001) 2013-01-28 18:25:26
#169 Gianluca Andriolo (Andriolo) 100 (3900) 2013-02-02 20:22:43
#170 Ikke Niet (ikkeniet) 100 (3250) 2013-02-05 14:28:37
#171 davidkk (dkln) 100 (700) 2013-02-08 03:38:41
#172 Al (AlK) 100 (400) 2013-02-16 18:15:07
#173 kuda poni (kuda poni) 100 (500) 2013-02-26 04:53:25
#174 Frans (fransl) 100 (2233) 2013-02-28 13:57:34
#175 Amit Pandey (schnider) 100 (500) 2013-03-06 07:52:33
#176 VINEET KUMAR SINGH (VKS) 100 (400) 2013-03-08 20:56:11
#177 Franc Marx (francmarx) 100 (900) 2013-03-12 10:17:09
#178 Anup (anup_kumar) 100 (400) 2013-03-13 13:10:23
#179 Md. Morpheus (Md. Morpheus) 100 (400) 2013-03-15 04:04:33
#180 vanderguile (vanderguile) 100 (2916) 2013-03-15 05:35:42
#181 Mayuresh Anand (effort2break) 100 (8728) 2013-03-18 22:15:31
#182 Ashraf Nadeem (anadeem) 100 (801) 2013-03-19 11:54:28
#183 mk (bilbobeutlin) 100 (12340) 2013-03-20 08:25:53
#184 RPH (derichard) 100 (27044) 2013-03-20 09:52:07
#185 Dhwanil (Ddk1989) 100 (1723) 2013-03-23 20:06:16
#186 Muendo (muendo) 100 (3501) 2013-03-24 16:52:46
#187 Klaus (hoevi) 100 (2302) 2013-03-26 15:45:30
#188 Petra (humppapenguin) 100 (3872) 2013-03-28 00:57:21
#189 sampi (sampi) 100 (400) 2013-04-01 03:00:37
#190 Velko Nikolov (staafl) 100 (13467) 2013-04-01 17:13:33
#191 Alban (jam63) 100 (1849) 2013-04-04 14:46:30
#192 Tom Tox (tox) 100 (17708) 2013-04-05 10:54:21
#193 thats_jordan (thats_jordan) 100 (500) 2013-04-08 11:55:41
#194 pb (pb) 100 (1421) 2013-04-10 21:50:17
#195 bh37 (bh37) 100 (1729) 2013-04-10 23:54:52
#196 coldwaterq (coldwaterq) 100 (1705) 2013-04-11 00:56:41
#197 Rajiv Vishwa (rocsci) 100 (800) 2013-04-11 02:44:21
#198 Dusan (xxdradus) 100 (40236) 2013-04-12 09:01:23
#199 Orfeas (ons) 100 (601) 2013-04-14 00:44:48
#200 Bernhard Gruber (bgr) 100 (22889) 2013-04-17 16:09:32
#201 deus_ex (deus_ex) 100 (1889) 2013-04-22 15:04:46
#202 Christian (BlueEagle87) 100 (500) 2013-04-22 16:01:07
#203 Steve (aimaz) 100 (2027) 2013-04-22 23:16:20
#204 Martin (Der Martin) 100 (400) 2013-04-22 23:17:27
#205 Oliver Schneider (cenn81) 100 (1100) 2013-04-23 06:52:58
#206 Jan B (conti72) 100 (400) 2013-04-23 07:59:18
#207 Konstantin (zieglerk) 100 (400) 2013-04-23 12:02:19
#208 Jörg Henle (Helvetix) 100 (400) 2013-04-23 12:15:13
#209 Rolf (Dupre) 100 (700) 2013-04-23 13:26:52
#210 Banes (Banes) 100 (300) 2013-04-23 15:38:21
#211 Almut (problelmo) 100 (45992) 2013-04-24 00:43:35
#212 Michael Reich (Walli) 100 (2288) 2013-04-24 14:52:35
#213 Matthias Thomas (vollhonk) 100 (600) 2013-04-24 18:52:27
#214 Frederik (Freed) 100 (900) 2013-04-24 21:48:29
#215 Carina (miss_cheer) 100 (500) 2013-04-25 11:29:44
#216 Stefan (sdn) 100 (5137) 2013-04-25 15:14:43
#217 Philipp (Igomorph) 100 (1612) 2013-04-29 20:34:02
#218 HE (hendeng) 100 (1600) 2013-05-03 09:12:51
#219 Silvia (Sina) 100 (512) 2013-05-05 17:39:46
#220 Martin Steinborn (Maldin) 100 (512) 2013-05-05 19:55:35
#221 A. S. (er1709) 100 (1608) 2013-05-05 23:45:47
#222 Alexander Buerger (a.buerger) 100 (2332) 2013-05-06 14:24:02
#223 Gabriel (mathgl24) 100 (2427) 2013-05-08 20:08:45
#224 Georgius Stolte (HazmatsFear) 100 (15671) 2013-05-11 18:21:20
#225 Javantea (Javantea) 100 (40816) 2013-05-16 04:29:53
#226 Clemens Schulz (caschulz) 100 (501) 2013-05-16 09:21:21
#227 djr (lentfri) 100 (2128) 2013-05-17 17:00:01
#228 Fuge (fugitech) 100 (917) 2013-05-20 19:37:59
#229 n a (jarofyarr) 100 (1901) 2013-05-23 09:18:32
#230 Klaus Busch (nylix) 100 (1022) 2013-05-24 12:37:56
#231 CryptY (Grompf) 100 (2880) 2013-05-29 11:29:31
#232 Peter Krause (H.M.Voynich) 100 (900) 2013-06-04 15:40:57
#233 Steve (Samacian) 100 (23804) 2013-06-05 03:44:14
#234 Reza Hoorfar (rhoorfar) 100 (400) 2013-06-06 00:59:51
#235 Tobias (tobyATMysteryTwister) 100 (400) 2013-06-17 13:58:25
#236 SG (Algorab) 100 (602) 2013-06-18 20:33:41
#237 Floyd (Code Breaker) 100 (600) 2013-06-18 21:47:45
#238 Gergely Simon (george314) 100 (16555) 2013-06-25 18:44:00
#239 Michael B. (MCB) 100 (400) 2013-06-30 20:23:14
#240 Xullo (Xullo) 100 (500) 2013-06-30 22:15:53
#241 Marian Schneider (marian04) 100 (500) 2013-07-03 13:33:43
#242 Hans (braime) 100 (600) 2013-07-10 22:43:12
#243 Philipp Hammer-Pohlau (phase2) 100 (17981) 2013-07-17 18:16:29
#244 yehuju (yehuju) 100 (400) 2013-07-19 03:31:05
#245 Vlatiha Romanova (Vlatiha) 100 (10323) 2013-07-31 17:30:10
#246 Hina (hinap) 100 (400) 2013-08-02 12:15:06
#247 Sascha (DoctorHell) 100 (1305) 2013-08-06 22:41:22
#248 oldak (oldak) 100 (1300) 2013-08-07 15:18:08
#249 Andreas H. (Cyrpius) 100 (2666) 2013-08-08 17:51:03
#250 Eyal (eyalfishel) 100 (3583) 2013-08-09 18:42:07
#251 Carlos (Ash25) 100 (1964) 2013-08-22 00:18:36
#252 Snow (serpent) 100 (1301) 2013-08-26 00:05:09
#253 George Lasry (george4096) 100 (287902) 2013-09-04 01:04:42
#254 Tanuvir Singh (tanuvir) 100 (1335) 2013-09-10 07:05:45
#255 zahir mohsen moradi (ariobarzan) 100 (99757) 2013-09-10 13:33:48
#256 myst3rytw1st3r (myst3rytw1st3r) 100 (500) 2013-09-18 08:06:53
#257 Farko (Farko) 100 (1622) 2013-09-24 02:45:16
#258 Erich (ErichSt) 100 (4862) 2013-09-24 23:47:24
#259 Aishwarya Mathuria (mathuria) 100 (600) 2013-10-01 18:57:44
#260 Björn Schließmann (chronoss) 100 (400) 2013-10-14 15:43:33
#261 Xabier (KALRONG) 100 (600) 2013-10-14 17:17:07
#262 Boris (Kaasu) 100 (16566) 2013-10-15 20:15:23
#263 netzfritze (netzfritze) 100 (700) 2013-10-25 07:35:30
#264 Jens (McStryke) 100 (1600) 2013-10-25 15:14:22
#265 Christopher (kurisutoper) 100 (600) 2013-11-04 03:36:17
#266 Philipp Knapp (philipp312) 100 (3357) 2013-11-13 22:32:02
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#568 Michael (FoM) 100 (17771) 2016-11-30 23:37:55
#569 J@cK (J@cK) 100 (3800) 2016-12-04 11:56:41
#570 Hofstadler David (HofDavid) 100 (500) 2016-12-06 10:33:43
#571 Creat1veM1ind (sokrates) 100 (2639) 2016-12-08 18:36:35
#572 Ulf Carleson (uffe) 100 (2005) 2016-12-13 16:12:34
#573 John Stenmark (DoggedWit) 100 (2405) 2016-12-17 02:49:10
#574 Nicholas (nichelfish) 100 (2205) 2016-12-18 02:54:54
#575 Ronny (kadenbach) 100 (1000) 2016-12-20 23:25:55
#576 André (Fielas) 100 (500) 2016-12-22 21:10:18
#577 Meine Registrierung (TryC3) 100 (6045) 2016-12-25 15:14:38
#578 Menden (jjm) 100 (700) 2017-01-04 15:55:34
#579 Ais (Ais) 100 (2105) 2017-01-10 14:22:24
#580 Martin (martinbucher) 100 (27363) 2017-01-11 12:27:53
#581 Edris (Edris) 100 (400) 2017-01-17 19:53:35
#582 Bernd (trimic) 100 (700) 2017-01-20 22:05:58
#583 jsoe luis (jostus11) 100 (700) 2017-01-23 13:18:35
#584 Chris (Chris089) 100 (600) 2017-01-25 10:52:09
#585 Sergio (sergiomoratino) 100 (1596) 2017-01-26 19:59:19
#586 jendzex (jendzex) 100 (200) 2017-01-28 05:27:14
#587 Rene (ion) 100 (5617) 2017-02-02 19:13:37
#588 Cyfer (Cyfer) 100 (1996) 2017-02-15 17:22:44
#589 klemen (klemenko7) 100 (600) 2017-02-20 18:29:37
#590 Mihail (plexor) 100 (16827) 2017-02-21 11:23:29
#591 Ylli (Aa112) 100 (2104) 2017-02-23 08:58:24
#592 Michael (Dimi) 100 (700) 2017-02-25 12:50:32
#593 Omlin (rohmux) 100 (700) 2017-02-27 14:51:06
#594 Mir Dim (mir0soft) 100 (72404) 2017-03-09 12:49:19
#595 Simon Hemmerich (simhem) 100 (700) 2017-03-13 13:20:54
#596 Andy Kennedy (chieftan1985) 100 (900) 2017-03-13 20:02:44
#597 Chicken Attack (joker1569) 100 (2603) 2017-03-15 14:42:58
#598 chris (c2) 100 (51973) 2017-03-16 12:54:08
#599 Julia Neitzke (neitzkejulia) 100 (500) 2017-03-16 14:49:52
#600 Jorge Lottermann (Jorgelotter) 100 (100) 2017-03-23 23:29:30
#601 Luciano Ignaczak (CryptoClass2017) 100 (3798) 2017-03-27 20:22:44
#602 Kai Fischell (MrFlector) 100 (1433) 2017-04-03 16:42:08
#603 Gerson (glumi) 100 (500) 2017-04-03 17:20:39
#604 Max (Max0526) 100 (300) 2017-04-26 13:27:53
#605 Peter Grosse-Hering (Peter) 100 (8097) 2017-04-26 20:26:21
#606 amin edraki (edrak1) 100 (1595) 2017-04-29 01:37:37
#607 Alex (oldmn15) 100 (3097) 2017-05-11 20:59:10
#608 Kasia (kasia-tutej) 100 (53366) 2017-05-26 10:31:34
#609 Kirsten Schulz (KISCHU67) 100 (900) 2017-05-30 21:55:47
#610 D3d4lu5 (D3d4lu5) 100 (183554) 2017-06-08 21:54:58
#611 Abhishek Ramchandran (andromedastrain) 100 (1694) 2017-06-28 05:37:35
#612 m13r (m13r) 100 (700) 2017-07-01 17:45:53
#613 Boinator (Boinator) 100 (700) 2017-07-11 09:05:44
#614 Moomin (Mushmom) 100 (7674) 2017-07-12 10:06:43
#615 sarah b (silva) 100 (10365) 2017-07-12 16:46:53
#616 Immo Weber (MandelToast) 100 (10061) 2017-08-07 14:27:17
#617 juw (juw) 100 (4179) 2017-08-10 18:51:37
#618 Kim H. S. (tenchijin) 100 (25468) 2017-08-20 00:37:35
#619 Godfrey Norton (Godfrey) 100 (8162) 2017-08-20 23:44:01
#620 nurnicu (nurnicu) 100 (1200) 2017-08-29 12:51:14
#621 Dennis Busch (0xDB) 100 (3693) 2017-09-25 16:31:22
#622 Sam (s@m) 100 (2000) 2017-10-11 13:35:06
#623 Thierry (LF) 100 (2000) 2017-10-12 18:19:16
#624 Dmitry Eremin-Solenikov (lumag) 100 (4482) 2017-10-16 09:28:55
#625 Manuela Erben (Himmelsfeuer) 100 (400) 2017-10-17 11:25:49
#626 Lukas Klawuhn (WurzelZwei) 100 (800) 2017-10-23 01:26:49
#627 Garfield (Garfield) 100 (500) 2017-11-05 20:33:11
#628 Luca (Azzosky) 100 (400) 2017-11-14 14:30:54
#629 NIck (nickoborn) 100 (600) 2017-11-15 10:24:25
#630 Handrich (Handrich) 100 (3494) 2017-11-15 17:16:30
#631 nimroth (nimroth cynthor) 100 (6021) 2017-11-16 19:34:21
#632 Henk (henkv) 100 (700) 2017-11-23 05:06:01
#633 roman (blanc) 100 (400) 2017-12-11 10:57:10
#634 teetrnker (teetrinker) 100 (2399) 2017-12-14 21:57:33
#635 eric (cirdan) 100 (700) 2017-12-19 15:11:46
#636 freak_out (freak_out) 100 (803) 2018-01-17 19:10:12
#637 Ines (bufo01) 100 (4515) 2018-01-17 22:55:58
#638 Andreas Zipse (zippi0815) 100 (3295) 2018-01-31 20:43:32
#639 Douglas (maisonboyle) 100 (1592) 2018-02-04 13:20:21
#640 Helmut (bonsai) 100 (3890) 2018-02-04 23:45:00
#641 Mar (Zit) 100 (1998) 2018-02-19 15:45:02
#642 Julian (Ju1703) 100 (4190) 2018-02-20 08:11:22
#643 ich (whoma) 100 (2299) 2018-02-20 16:56:51
#644 Christian (MarquisDeSud) 100 (3788) 2018-02-26 11:30:20
#645 Diego Moreira Matos (digomatos) 100 (300) 2018-03-21 23:28:30
#646 Lucas (Beastwood) 100 (1999) 2018-03-23 14:06:50
#647 Luciano Ignaczak (ignaczak) 100 (3390) 2018-03-30 04:49:01
#648 Benjamin (200611736) 100 (7776) 2018-04-01 23:26:46
#649 Fedilia (Fedilia) 100 (4489) 2018-04-07 13:46:09
#650 Nimsoo Sun (Nimsoosun) 100 (2518) 2018-04-08 13:44:18
#651 Lara Riegelhofer (larrow_sparrow) 100 (2798) 2018-04-08 15:59:24
#652 Luigi Castro Alvis (LuigiCastro21) 100 (2417) 2018-04-12 04:23:49
#653 Diego Ucharima (Diego_Ucharima) 100 (2206) 2018-04-14 19:58:35
#654 Lucio (lcalderonc) 100 (1251) 2018-04-19 00:22:32
#655 Diego (DiegoRA) 100 (3697) 2018-04-19 02:00:38
#656 Lerni (JaimeJM) 100 (1000) 2018-04-19 03:55:34
#657 Christian (Cfrigo) 100 (1491) 2018-04-26 02:09:13
#658 Victor Cueva (Victoralin10) 100 (5282) 2018-04-26 03:38:25
#659 Carlos (OzBlanco) 100 (3596) 2018-04-29 21:06:53
#660 Lish (LishaSantiago) 100 (500) 2018-04-30 01:42:45
#661 yuri mach (yurimach) 100 (1100) 2018-04-30 02:34:24
#662 yajaira (yahe) 100 (700) 2018-04-30 08:11:28
#663 Johannes (fr0sch) 100 (1897) 2018-05-08 00:49:11
#664 Eric (ExAstris) 100 (26990) 2018-05-14 21:22:27
#665 diewg (DieWg) 100 (300) 2018-05-14 23:57:12
#666 Steve Vaillancourt (stvai2) 100 (15041) 2018-05-15 18:27:44
#667 Christophe BORELLY (cb34) 100 (12358) 2018-05-30 08:20:06
#668 Durward McDonell (durward) 100 (5265) 2018-06-07 16:38:47
#669 Random Dude (rnd) 100 (67574) 2018-06-11 02:40:57
#670 Aiswarya Subramanian (Aiswarya) 100 (300) 2018-07-02 09:01:28
#671 Neal (Akuro) 100 (600) 2018-07-03 17:49:16
#672 E41514013 (E41514013) 100 (4167) 2018-07-04 03:28:23
#673 E41514015 (E41514015) 100 (2985) 2018-07-04 03:54:33
#674 E41514009 (E41514009) 100 (1000) 2018-07-04 03:57:30
#675 E41514050 (E41514050) 100 (3870) 2018-07-04 03:57:42
#676 panqi (pq) 100 (1889) 2018-07-04 04:04:58
#677 LQL (E41514067) 100 (3180) 2018-07-04 04:11:42
#678 YKJ (E41514070) 100 (1896) 2018-07-04 04:28:56
#679 E41514047 (ding) 100 (700) 2018-07-04 04:33:14
#680 cyx (cyxxxqhs) 100 (600) 2018-07-04 04:33:48
#681 wff1315 (wff) 100 (1789) 2018-07-04 04:36:57
#682 E41514019 (E41514019) 100 (2885) 2018-07-04 04:48:00
#683 jzx0924 (jzx0924) 100 (300) 2018-07-04 04:48:19
#684 胡俊杰 (二十六) 100 (500) 2018-07-04 04:58:17
#685 shuiyu (shuiyu) 100 (500) 2018-07-04 05:02:19
#686 E41514057 (E41514057) 100 (1796) 2018-07-04 05:13:33
#687 DOG凯 (孙凯) 100 (400) 2018-07-04 05:25:56
#688 Cava (Cava) 100 (500) 2018-07-04 05:30:45
#689 E41514006 (E41514006) 100 (4957) 2018-07-04 05:33:42
#690 E41514023 (E41514023) 100 (3967) 2018-07-04 05:43:03
#691 yangshuai (E41514049) 100 (500) 2018-07-04 05:46:37
#692 abc (enigma_0101) 100 (800) 2018-07-06 22:26:56
#693 Arbacle Clemens (arbacle) 100 (2502) 2018-07-21 21:08:59
#694 Matteo (mr96) 100 (600) 2018-07-29 13:23:10
#695 Filippe Guerreiro Carvalho (filippegc) 100 (700) 2018-08-10 19:59:33
#696 Fabricio (fabricio) 100 (300) 2018-08-15 21:58:41
#697 Andrei Gasparovici (fullofvim) 100 (1861) 2018-08-17 19:43:01
#698 mykallan (mikeA) 100 (2197) 2018-08-18 21:22:13
#699 johndoe (Anon1283) 100 (700) 2018-08-18 22:48:33
#700 Lukas Nagelschmidt (lan) 100 (1996) 2018-08-26 23:10:54
#701 Luth (Luthorien) 100 (600) 2018-08-30 09:35:24
#702 Jennifer (jennipher) 100 (500) 2018-09-02 15:57:48
#703 Thiago Araujo Pereira (thiagoap) 100 (500) 2018-09-06 20:49:24
#704 Laís Titoni (ltc) 100 (400) 2018-09-06 22:00:11
#705 Rahm (rmartins) 100 (1996) 2018-09-08 23:20:33
#706 Dushyant (dk_1111) 100 (700) 2018-09-24 15:44:07
#707 Yggi (Yggi) 100 (2295) 2018-10-01 15:56:35
#708 Mathijs Verbeek (QIXL) 100 (3096) 2018-10-02 12:40:41
#709 Rolf (Hornet) 100 (800) 2018-10-11 17:37:18
#710 Beamofoldlight (Beamofoldlight) 100 (2295) 2018-10-15 20:28:33
#711 Thalhammer (Thalhammer) 100 (3784) 2018-10-16 20:14:25
#712 simone (xseris) 100 (700) 2018-10-20 12:57:04
#713 jusb3 (jusb3) 100 (2199) 2018-10-26 01:29:34
#714 Jan Kowalski (jankowalski25) 100 (2195) 2018-10-26 12:59:08
#715 phoenix1204 (phoenix1204) 100 (1800) 2018-10-26 13:58:09
#716 Mart (Mart) 100 (3584) 2018-10-26 19:12:48
#717 _o_ (_o_) 100 (1000) 2018-10-26 22:53:04
#718 Ne0Lux-C1Ph3r (Ne0Lux-C1Ph3r) 100 (800) 2018-10-27 06:06:42
#719 Ekrem Aydin (Eko115) 100 (1105) 2018-10-27 15:52:52
#720 Caro (Silverice78) 100 (2195) 2018-10-31 15:55:38
#721 mglarragan (mglarragan) 100 (1990) 2018-11-10 10:41:41
#722 Nadiminty Kaundinya (nkandy44) 100 (3384) 2018-11-12 18:38:55
#723 Manfred Paul (manf) 100 (14774) 2018-11-13 21:47:59
#724 steven (steven18) 100 (2491) 2018-11-25 17:10:39
#725 jordi (aidle) 100 (300) 2018-11-28 18:57:29
#726 Alex (Meiny) 100 (3883) 2018-12-06 12:26:23
#727 John Doe (csce2018) 100 (600) 2018-12-13 08:00:42
#728 chinafish (adomore) 100 (600) 2018-12-17 18:15:01
#729 mathpseudo (mathpseudo1) 100 (600) 2018-12-25 15:37:04
#730 Clemens (16dombrowski) 100 (3983) 2018-12-27 18:52:46
#731 Hipster (Hipster) 100 (1789) 2018-12-30 01:39:15
#732 Scholars (Xnc Ymd) 100 (900) 2018-12-30 14:56:54
#733 Hugh (hugh) 100 (400) 2019-01-03 07:24:58
#734 Ima (CrazyX) 100 (600) 2019-01-03 15:30:59
#735 Piotr (lesnik7) 100 (4483) 2019-01-06 14:40:29
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The Book Code: A Challenge for Bookworms

[meier-03] - 120 users already solved this challenge, 21 are working on it.
 
 
 

In order to decrypt the intercepted letter addressed to your neighbor, you need to find out which document has been used to encode the message with the book code.
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Click here to get to the corresponding forum topic to share your opinion.
Click here to download the challenge.

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2012-03-21 11:02
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#120) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 200 (134627) 2012-03-21 14:09:53
Hans Peter (hanspeter) 200 (52256) 2012-03-21 16:45:18
Armin Krauss (argh) 200 (171390) 2012-03-21 18:35:26
Kurt Gebauer (Yokozuna) 200 (142278) 2012-03-21 18:40:55
#5 Seth Kintigh (DarkFibre) 200 (79471) 2012-03-21 19:27:53
#6 Nathan (Witten) 200 (25326) 2012-03-21 22:23:24
#7 J. M. (jomandi) 200 (113270) 2012-03-21 22:28:00
#8 dbuq (dbuq) 200 (22762) 2012-03-21 23:36:52
#9 Bart den Hartog (Bart13) 150 (118984) 2012-03-22 11:24:42
#10 Christof Kleber (Loki) 150 (6051) 2012-03-22 14:41:45
#11 Michael Gürtler (michaelg) 150 (4128) 2012-03-22 15:29:54
#12 Thomas Gonda (TomG) 133 (36291) 2012-03-23 13:28:37
#13 David (aki321) 133 (27482) 2012-03-23 21:46:41
#14 j.h. (haegarq) 117 (15252) 2012-03-27 10:52:16
#15 Dusan (xxdradus) 110 (40236) 2012-03-30 16:32:48
#16 Luigi Tomelli (archstanton) 108 (106685) 2012-04-03 08:49:02
#17 Paco (Methos259) 106 (106) 2012-04-06 00:12:27
#18 Kevin (0xf0unD) 106 (217) 2012-04-08 00:16:43
#19 Dustin Smith (dvst1n) 105 (415) 2012-04-09 20:33:17
#20 Wombat (Wombat) 104 (5822) 2012-04-12 15:05:47
#21 E.T (Ertheb) 104 (70149) 2012-04-12 18:31:21
#22 Aliazer (Aliazer) 104 (12314) 2012-04-13 12:07:24
#23 Sean Atkinson (Seanwatkinson) 104 (410) 2012-04-15 21:39:49
#24 H. Lautenschlager (helmi) 103 (29022) 2012-04-27 00:05:02
#25 Jarosław Szcześniewski (Zjarek) 103 (203) 2012-04-29 23:25:03
#26 Name (geekon) 103 (103) 2012-04-29 23:43:05
#27 Paul Duplys (pd) 102 (1525) 2012-05-02 23:32:59
#28 Christopher (nomadpenguin) 102 (202) 2012-05-03 02:40:10
#29 Christof B. (beans90) 102 (9488) 2012-05-05 22:30:09
#30 captp (bdcht) 102 (5864) 2012-05-08 23:11:26
#31 Bernd Klimaschewski (cryptonoob) 101 (1003) 2012-06-06 19:23:14
#32 Sebastian Slupina (Grandwizard) 101 (10264) 2012-07-13 01:27:07
#33 KW (qwer*) 101 (13963) 2012-08-04 19:47:22
#34 Max (131x) 101 (1659) 2012-08-13 14:28:00
#35 George (Theofanidis) 101 (101521) 2012-08-30 17:35:24
#36 Hank (hanky) 101 (22859) 2012-09-09 02:27:59
#37 chris_3stones (3stones) 101 (37759) 2012-09-11 07:47:24
#38 Martina (Nikita) 101 (3863) 2012-09-27 19:36:49
#39 Benny (Kingombo) 101 (3663) 2012-09-27 19:45:21
#40 Hannes (Hartmann) 100 (8680) 2012-10-15 23:09:57
#41 Harry (Schwabenbambi) 100 (2409) 2012-10-20 12:40:09
#42 Em Doulgerakis (Greko) 100 (124033) 2012-10-21 13:48:43
#43 George Ho (GeorgH) 100 (3095) 2012-12-02 10:05:09
#44 zahir mohsen moradi (ariobarzan) 100 (99757) 2013-01-26 20:05:58
#45 Snake (snk) 100 (67306) 2013-01-28 15:56:21
#46 Michal (misoxxx) 100 (1710) 2013-01-30 17:32:34
#47 Iain Sharp (WoodenHedgehog) 100 (2196) 2013-02-01 17:20:46
#48 RPH (derichard) 100 (27044) 2013-03-20 09:33:31
#49 Mayuresh Anand (effort2break) 100 (8728) 2013-03-23 15:34:35
#50 Kirill (ineaugh) 100 (1920) 2013-03-24 02:44:55
#51 Tom Tox (tox) 100 (17708) 2013-04-04 18:34:32
#52 mk (bilbobeutlin) 100 (12340) 2013-04-09 16:44:23
#53 Velko Nikolov (staafl) 100 (13467) 2013-04-10 10:03:57
#54 Julia Werdelmann (jw) 100 (10407) 2013-04-15 23:40:49
#55 Bernhard Gruber (bgr) 100 (22889) 2013-04-26 19:15:18
#56 Gabriel (mathgl24) 100 (2427) 2013-05-16 00:26:11
#57 Felix (Flix) 100 (13712) 2013-05-28 23:12:00
#58 Steve (Samacian) 100 (23804) 2013-06-10 12:23:14
#59 Bernd (BRK) 100 (2275) 2013-07-06 13:47:12
#60 Sascha (DoctorHell) 100 (1305) 2013-07-09 20:28:45
#61 Philipp Hammer-Pohlau (phase2) 100 (17981) 2013-07-28 20:08:20
#62 Hans Joachim Girulat (joregi) 100 (33493) 2013-08-05 20:30:49
#63 Boris (Kaasu) 100 (16566) 2013-10-28 18:17:27
#64 Brad (braddrew) 100 (15878) 2013-12-21 08:50:21
#65 Kim H. S. (tenchijin) 100 (25468) 2014-01-05 21:02:05
#66 Alain (Integral) 100 (207924) 2014-01-07 12:14:38
#67 Marcel (bene1512) 100 (20896) 2014-02-13 22:40:44
#68 Karl Schutt (günter) 100 (39890) 2014-03-27 21:55:54
#69 Diego (druk) 100 (800) 2014-03-30 18:12:30
#70 Lutz Sittinger (Kryptolutz) 100 (1802) 2014-06-01 17:20:09
#71 Tina (BTina) 100 (1500) 2014-06-01 20:29:47
#72 Julia Bernotat (El Greco ) 100 (81129) 2014-07-30 19:37:44
#73 Robert (rm) 100 (56475) 2014-07-31 22:35:44
#74 julius gaius (julius) 100 (25581) 2014-08-06 08:58:26
#75 Tim Fink (Magellan) 100 (4876) 2014-10-11 10:08:38
#76 Lane Williams (planetlane) 100 (15331) 2014-10-17 21:27:34
#77 Francisco Moraes (fmoraes) 100 (90044) 2014-11-18 21:07:25
#78 Pavel (haw) 100 (22728) 2014-12-05 14:26:01
#79 Michael Jeffrey (empjay) 100 (3004) 2014-12-12 15:23:16
#80 HolgerK (HolgerK) 100 (25776) 2014-12-22 23:42:32
#81 mirth23 (mirth23) 100 (7050) 2015-02-19 19:33:29
#82 micaman (micaman) 100 (4634) 2015-02-19 20:50:33
#83 Rainer Zufall (kiekuk) 100 (53834) 2015-02-26 09:16:06
#84 curmudgeon (curmudgeon) 100 (711) 2015-03-23 08:08:14
#85 Andreas Frerichs (Ossili) 100 (33266) 2015-04-02 18:42:21
#86 partamier (yann) 100 (5435) 2015-05-15 16:37:47
#87 Michael Ammon (Ammonym) 100 (7719) 2015-06-19 17:41:21
#88 Mark van Heeswijk (markvh) 100 (2600) 2015-07-13 01:21:42
#89 Joerg G. (SnifferMaster) 100 (17853) 2015-09-30 09:25:00
#90 Alain Collignon (vexilla72) 100 (75089) 2015-10-01 15:37:32
#91 J-L Morel (Rossignol) 100 (29125) 2015-10-04 09:54:12
#92 S (Zyphe) 100 (9371) 2015-10-25 15:21:14
#93 Isabella (Isa) 100 (4235) 2015-11-01 19:20:08
#94 Andre Mueller (amueller) 100 (3215) 2015-12-14 21:01:39
#95 Corneli Keim (cryptina) 100 (703) 2015-12-19 21:43:50
#96 Imam Uasa (Merricx) 100 (9188) 2015-12-25 07:52:45
#97 Graham (graham107) 100 (400) 2016-01-07 22:29:27
#98 Szabó Zoltán (szabo.z87) 100 (55604) 2016-01-29 12:30:17
#99 Marco Manfredi (mkk9901) 100 (17686) 2016-03-08 17:41:00
#100 Kurona (Kurona) 100 (1100) 2016-05-31 10:55:50
#101 Robert Kosten (Robert Kosten) 100 (2724) 2016-09-09 13:10:28
#102 Norbert Biermann (Norbert) 100 (44430) 2016-09-18 22:27:24
#103 Nicolas (nicosPavlov) 100 (151166) 2016-10-01 16:21:01
#104 Bertold (bk) 100 (9673) 2016-10-01 18:01:40
#105 Simon Jakob (simon.jakob) 100 (18714) 2016-11-24 22:19:18
#106 Michael (FoM) 100 (17771) 2016-11-30 18:15:21
#107 Tristan1473 (Tristan1473) 100 (18914) 2017-02-05 19:15:50
#108 Mir Dim (mir0soft) 100 (72404) 2017-03-17 21:22:35
#109 chris (c2) 100 (51973) 2017-03-26 21:56:40
#110 Dominik M. (Sgt. Pepper) 100 (84103) 2017-04-02 16:59:32
#111 Daniel Walder (ibex) 100 (14372) 2017-04-28 10:51:07
#112 sarah b (silva) 100 (10365) 2017-06-07 18:34:09
#113 D3d4lu5 (D3d4lu5) 100 (183554) 2017-06-10 03:46:42
#114 Martin (Ehmpunkt) 100 (700) 2017-08-31 17:13:56
#115 nimroth (nimroth cynthor) 100 (6021) 2017-11-27 22:10:43
#116 Dusan Djuric (flapjack) 100 (2104) 2018-02-03 11:27:58
#117 Julian (Lemmynator) 100 (16666) 2018-03-17 00:19:25
#118 Eric (ExAstris) 100 (26990) 2018-05-23 02:06:27
#119 Benjamin (200611736) 100 (7776) 2018-06-02 21:49:04
#120 Random Dude (rnd) 100 (67574) 2018-08-01 02:22:56
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Monoalphabetic Substitution with Camouflage — Part 5

[veselovsky-13] - 23 users already solved this challenge.
 
 
 

In the fifth part the same variant of the cipher already introduced in Part 3 and 4 of this challenge has been used here, too. The only difference is that spaces were removed previously to the encryption process.
Read more...

Click here to get to the corresponding forum topic to share your opinion.
Click here to download the challenge.

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2012-03-09 21:49
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#23) Achieved points (Global score) y-m-d - h:m:s

The Killer (Killer) 2000 (42393) 2012-03-10 18:17:46
J. M. (jomandi) 2000 (113270) 2012-03-10 18:57:08
Armin Krauss (argh) 2000 (171390) 2012-03-10 21:16:55
Seth Kintigh (DarkFibre) 1824 (79471) 2012-03-11 00:47:49
#5 Peter Mustermann (Gummiboot) 1547 (60285) 2012-03-16 20:59:40
#6 Bart den Hartog (Bart13) 1378 (118984) 2012-03-30 11:45:54
#7 zahir mohsen moradi (ariobarzan) 1141 (99757) 2013-08-30 17:08:47
#8 Alain (Integral) 1133 (207924) 2014-01-02 23:38:42
#9 George (Theofanidis) 1125 (101521) 2014-06-09 16:23:22
#10 Snake (snk) 1125 (67306) 2014-06-15 15:52:48
#11 Francisco Moraes (fmoraes) 1119 (90044) 2014-11-13 01:37:40
#12 Julia Bernotat (El Greco ) 1118 (81129) 2014-12-16 23:53:53
#13 Kurt Gebauer (Yokozuna) 1117 (142278) 2015-01-14 19:29:23
#14 HolgerK (HolgerK) 1113 (25776) 2015-05-14 20:38:49
#15 Robert (rm) 1112 (56475) 2015-07-22 22:23:43
#16 Szabó Zoltán (szabo.z87) 1108 (55604) 2015-12-29 19:29:32
#17 Marc (rcll0891) 1107 (20690) 2016-03-03 20:39:35
#18 Norbert Biermann (Norbert) 1103 (44430) 2016-09-09 13:10:17
#19 Nicolas (nicosPavlov) 1102 (151166) 2016-11-21 14:27:28
#20 George Lasry (george4096) 1098 (287902) 2017-07-29 11:30:40
#21 D3d4lu5 (D3d4lu5) 1097 (183554) 2017-09-06 07:03:14
#22 Alain Collignon (vexilla72) 1095 (75089) 2018-03-13 14:44:44
#23 Dominik M. (Sgt. Pepper) 1094 (84103) 2018-07-17 18:28:56
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ECDH-Key Exchange for Beginners

[meier-02] - 78 users already solved this challenge, 2 are working on it.
 
 
 

Alice and Bob would like to agree upon a shared key. They use an Elliptic Curve Diffie-Hellman (ECDH) key-exchange protocol. Try to reproduce the steps that are necessary to calculate the key and to decrypt Bob's message.
Read more...

Click here to get to the corresponding forum topic to share your opinion.
Click here to download the challenge.

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2012-02-24 00:00
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#78) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 200 (134627) 2012-02-24 01:30:57
Bart den Hartog (Bart13) 200 (118984) 2012-02-24 05:01:51
Seth Kintigh (DarkFibre) 200 (79471) 2012-02-24 05:50:55
Armin Krauss (argh) 200 (171390) 2012-02-24 08:50:00
#5 Hans Peter (hanspeter) 200 (52256) 2012-02-24 10:54:50
#6 J. M. (jomandi) 200 (113270) 2012-02-24 13:48:27
#7 dbuq (dbuq) 200 (22762) 2012-02-24 15:06:14
#8 Nathan (Witten) 150 (25326) 2012-02-25 00:13:09
#9 Roland Jansen (roland) 133 (17607) 2012-02-26 16:55:27
#10 Lukas (Kahla) 133 (4719) 2012-02-26 21:45:36
#11 Luigi Tomelli (archstanton) 120 (106685) 2012-02-28 09:14:45
#12 Julius Sewing (H3BX) 120 (332) 2012-02-28 13:29:44
#13 Michel Van Caneghem (vancan) 120 (49719) 2012-02-28 22:05:39
#14 Daniel Fretwell (fretty) 120 (30107) 2012-02-28 23:48:52
#15 Thomas Lambert (lambert) 108 (38594) 2012-03-07 15:10:35
#16 bubba gump (surrenderyourworld) 104 (925) 2012-03-18 17:02:14
#17 Steluta P. (maty_star) 102 (5734) 2012-04-06 00:15:40
#18 Roxana Ioana (rock_sana) 102 (610) 2012-04-11 10:22:19
#19 Aliazer (Aliazer) 102 (12314) 2012-04-13 12:10:20
#20 George (Theofanidis) 102 (101521) 2012-04-16 23:44:55
#21 captp (bdcht) 101 (5864) 2012-05-09 09:53:00
#22 Kurt Gebauer (Yokozuna) 101 (142278) 2012-05-11 00:40:26
#23 E.T (Ertheb) 101 (70149) 2012-05-24 13:27:12
#24 Dusan (xxdradus) 101 (40236) 2012-05-27 12:14:30
#25 Daniel Richter (TheHiveMind) 101 (11147) 2012-06-19 09:50:04
#26 Em Doulgerakis (Greko) 101 (124033) 2012-07-06 16:40:21
#27 chris_3stones (3stones) 101 (37759) 2012-08-19 09:16:38
#28 KW (qwer*) 101 (13963) 2012-09-03 19:42:54
#29 H. Lautenschlager (helmi) 100 (29022) 2012-10-06 16:16:12
#30 Friedrich Wiemer (asante) 100 (5183) 2012-11-04 22:56:25
#31 Andrew (Agromania) 100 (4508) 2012-11-15 10:13:02
#32 fabian (faru) 100 (300) 2013-02-06 23:17:19
#33 Kirill (ineaugh) 100 (1920) 2013-03-25 00:17:47
#34 RPH (derichard) 100 (27044) 2013-04-12 10:10:01
#35 Vlatiha Romanova (Vlatiha) 100 (10323) 2013-06-27 11:21:01
#36 Carsten Hess (machess) 100 (700) 2013-07-27 11:05:23
#37 zahir mohsen moradi (ariobarzan) 100 (99757) 2013-08-08 20:31:11
#38 Almut (problelmo) 100 (45992) 2013-08-19 16:36:54
#39 Geoffrey (FreshGod) 100 (2163) 2013-08-28 11:00:06
#40 Alexander (cruachan) 100 (16051) 2013-10-01 23:25:08
#41 Gergely Simon (george314) 100 (16555) 2013-10-02 20:53:40
#42 Steve (Samacian) 100 (23804) 2013-10-29 06:48:28
#43 Snake (snk) 100 (67306) 2013-11-20 17:48:27
#44 Brad (braddrew) 100 (15878) 2013-12-14 10:34:24
#45 Alain (Integral) 100 (207924) 2013-12-28 09:19:16
#46 Pavel (haw) 100 (22728) 2014-01-06 15:01:25
#47 Forrest Gump (Polyphem) 100 (38763) 2014-01-24 17:53:22
#48 caesar ([caesar]) 100 (10738) 2014-03-24 10:39:27
#49 Karl Schutt (günter) 100 (39890) 2014-04-01 21:40:10
#50 Robert (rm) 100 (56475) 2014-07-31 22:50:40
#51 Julia Bernotat (El Greco ) 100 (81129) 2014-08-04 17:50:29
#52 Sebastian Slupina (Grandwizard) 100 (10264) 2014-10-13 17:07:17
#53 Francisco Moraes (fmoraes) 100 (90044) 2014-11-03 22:27:16
#54 Andreas Frerichs (Ossili) 100 (33266) 2015-01-06 15:49:00
#55 HolgerK (HolgerK) 100 (25776) 2015-01-10 20:55:29
#56 Javantea (Javantea) 100 (40816) 2015-01-23 00:32:25
#57 Rainer Zufall (kiekuk) 100 (53834) 2015-05-07 12:06:18
#58 Fabio (degrigis) 100 (1206) 2015-07-15 18:04:03
#59 Erik (Erox) 100 (22651) 2015-08-28 13:09:21
#60 Claude Vaillancourt (Cl3v3r) 100 (38351) 2015-09-18 20:13:54
#61 S (Zyphe) 100 (9371) 2015-10-26 12:49:19
#62 Alain Collignon (vexilla72) 100 (75089) 2015-11-03 06:03:14
#63 Martin (martinbucher) 100 (27363) 2016-01-02 11:18:48
#64 Lane Williams (planetlane) 100 (15331) 2016-01-25 21:28:42
#65 Dominik M. (Sgt. Pepper) 100 (84103) 2016-10-02 14:52:04
#66 Nicolas (nicosPavlov) 100 (151166) 2016-10-15 06:56:38
#67 Marcel (bene1512) 100 (20896) 2016-12-30 09:38:22
#68 Michael (FoM) 100 (17771) 2017-01-13 14:36:58
#69 Simon Hemmerich (simhem) 100 (700) 2017-03-13 11:06:49
#70 chris (c2) 100 (51973) 2017-04-25 14:28:55
#71 Mir Dim (mir0soft) 100 (72404) 2017-05-25 13:56:06
#72 Felix (Flix) 100 (13712) 2017-05-30 21:52:08
#73 Kasia (kasia-tutej) 100 (53366) 2017-06-06 14:44:49
#74 D3d4lu5 (D3d4lu5) 100 (183554) 2017-06-25 08:59:49
#75 john doe (misio) 100 (7371) 2017-12-04 21:45:15
#76 Eric (ExAstris) 100 (26990) 2018-05-27 22:10:35
#77 Random Dude (rnd) 100 (67574) 2018-07-17 03:06:07
#78 Ekrem Aydin (Eko115) 100 (1105) 2018-10-27 17:07:50
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Partial Key Exposure with RSA — Part 1

[koy-01] - 65 users already solved this challenge, 11 are working on it.
 
 
 

With RSA keys, the private key d must remain private. If the public key e is very small, this is not completely possible. This exercise demonstrates how simple it is to compute a portion of the secret key d.
Read more...

Click here to get to the corresponding forum topic to share your opinion.
Click here to download the challenge.

Authors: This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2012-02-11 13:20
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#65) Achieved points (Global score) y-m-d - h:m:s

Bart den Hartog (Bart13) 2000 (118984) 2012-02-11 13:23:49
Viktor (Veselovský) 2000 (134627) 2012-02-11 13:32:57
J. M. (jomandi) 2000 (113270) 2012-02-11 13:58:47
Nathan (Witten) 2000 (25326) 2012-02-11 14:53:02
#5 The Killer (Killer) 2000 (42393) 2012-02-11 15:19:01
#6 Armin Krauss (argh) 2000 (171390) 2012-02-11 16:11:07
#7 Michel Van Caneghem (vancan) 2000 (49719) 2012-02-11 17:53:01
#8 Seth Kintigh (DarkFibre) 2000 (79471) 2012-02-11 20:11:15
#9 Peter Mustermann (Gummiboot) 1824 (60285) 2012-02-12 14:49:20
#10 Jean-Baptiste Mossé (intersect) 1576 (1676) 2012-02-16 13:24:30
#11 Martin Härterich (HaeM) 1398 (15149) 2012-02-28 16:17:44
#12 Thomas Gonda (TomG) 1362 (36291) 2012-03-05 15:41:48
#13 Luigi Tomelli (archstanton) 1362 (106685) 2012-03-05 16:10:07
#14 Keith Randall (randall77) 1362 (31011) 2012-03-06 01:42:39
#15 Kurt Gebauer (Yokozuna) 1279 (142278) 2012-04-05 13:18:28
#16 Hans Peter (hanspeter) 1278 (52256) 2012-04-05 22:03:17
#17 Aliazer (Aliazer) 1258 (12314) 2012-04-20 21:27:38
#18 Thomas Lambert (lambert) 1256 (38594) 2012-04-21 18:04:08
#19 chris_3stones (3stones) 1187 (37759) 2012-08-30 08:14:28
#20 George (Theofanidis) 1187 (101521) 2012-08-30 08:15:34
#21 Em Doulgerakis (Greko) 1187 (124033) 2012-08-30 08:43:59
#22 Claude Laveaux (claude.laveaux) 1163 (14504) 2012-12-31 13:56:38
#23 Velko Nikolov (staafl) 1149 (13467) 2013-04-25 01:22:32
#24 Almut (problelmo) 1144 (45992) 2013-06-18 20:55:18
#25 zahir mohsen moradi (ariobarzan) 1143 (99757) 2013-07-06 16:45:54
#26 Daniel Fretwell (fretty) 1140 (30107) 2013-08-08 15:49:56
#27 Forrest Gump (Polyphem) 1138 (38763) 2013-09-09 02:08:31
#28 Tanuvir Singh (tanuvir) 1135 (1335) 2013-10-26 21:12:00
#29 Rohit Vobbilisetty (vrohit13) 1135 (1135) 2013-10-26 21:19:12
#30 Francisco Moraes (fmoraes) 1134 (90044) 2013-11-17 22:03:09
#31 Brad (braddrew) 1132 (15878) 2013-12-23 05:04:34
#32 Alain (Integral) 1130 (207924) 2014-02-01 17:22:12
#33 hellman (hellman) 1128 (14862) 2014-03-12 15:48:44
#34 Michael Doucha (mdou) 1126 (13757) 2014-04-14 22:01:32
#35 Thomas Schmucker (dg) 1125 (26066) 2014-05-11 23:29:09
#36 BHAVNA (bhavna) 1119 (1119) 2014-10-14 00:34:45
#37 Bhavna Gurnani (Bhavna Gurnani) 1118 (1118) 2014-11-08 01:35:37
#38 Julia Bernotat (El Greco ) 1117 (81129) 2014-11-29 00:38:21
#39 Robert (rm) 1117 (56475) 2014-12-05 01:22:25
#40 Hank (hanky) 1116 (22859) 2015-01-25 19:07:36
#41 Jeremy Chuang (jeremhh) 1115 (6643) 2015-02-17 01:18:18
#42 R (r?) 1114 (6742) 2015-03-15 22:45:15
#43 Claude Vaillancourt (Cl3v3r) 1110 (38351) 2015-08-12 15:45:55
#44 Javantea (Javantea) 1110 (40816) 2015-08-27 18:37:35
#45 Sean (Kavanaugh) 1110 (29143) 2015-09-15 00:47:45
#46 S Combes (jerva) 1109 (99132) 2015-10-24 18:11:40
#47 Szabó Zoltán (szabo.z87) 1108 (55604) 2015-11-12 12:31:39
#48 Alain Collignon (vexilla72) 1108 (75089) 2015-11-18 10:00:05
#49 Dominik M. (Sgt. Pepper) 1107 (84103) 2015-12-23 14:26:07
#50 Andreas Frerichs (Ossili) 1106 (33266) 2016-02-26 20:26:07
#51 Rainer Zufall (kiekuk) 1106 (53834) 2016-02-26 23:24:36
#52 Norbert Biermann (Norbert) 1104 (44430) 2016-07-10 20:28:32
#53 Nicolas (nicosPavlov) 1102 (151166) 2016-10-18 18:14:10
#54 Tristan1473 (Tristan1473) 1100 (18914) 2017-02-04 09:18:00
#55 Georgius Stolte (HazmatsFear) 1100 (15671) 2017-02-27 20:32:15
#56 Mir Dim (mir0soft) 1099 (72404) 2017-03-29 14:58:43
#57 chris (c2) 1099 (51973) 2017-04-02 16:28:52
#58 Kasia (kasia-tutej) 1098 (53366) 2017-06-01 15:14:34
#59 D3d4lu5 (D3d4lu5) 1098 (183554) 2017-07-12 18:19:58
#60 George Lasry (george4096) 1098 (287902) 2017-07-30 00:01:46
#61 Aijun (geaijun) 1096 (3379) 2018-01-09 01:43:23
#62 Erik (Erox) 1094 (22651) 2018-05-12 15:39:20
#63 Eric (ExAstris) 1094 (26990) 2018-06-27 02:17:47
#64 Karl Schutt (günter) 1093 (39890) 2018-08-08 22:25:19
#65 Random Dude (rnd) 1093 (67574) 2018-10-01 16:42:43
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   +++    [12:16 - 16.01.2019] mhoefl solved the Level I challenge 'Number Sequence — Part 4'    +++    [06:17 - 16.01.2019] haegarq solved the Level I challenge 'Cryptanalysis Hacking Puzzles — Part 2'    +++    [23:46 - 15.01.2019] bcarey92 solved the Level I challenge 'Original Caesar Cipher'    +++    [23:24 - 15.01.2019] FindNix11 solved the Level I challenge 'Number Sequence'    +++    [22:57 - 15.01.2019] silva solved the Level I challenge 'Cryptanalysis Hacking Puzzles — Part 2'    +++