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 (269)

Ordered by date posted, the most recent appear first.

Classical Ciphers^3

[wacker-01] - 149 users already solved this challenge, 15 are working on it.
 
 
 

This challenge contains three messages encrypted with classical ciphers. You will need break each of the ciphers and take note of the three codewords. When you have all three codewords, submit them in the form "codeword1-codeword2-codeword3". Please note that the codewords are case sensitive and you have only 5 trials to find the correct solution.

The MTC3 team wishes everybody much success and fun in finding the correct solution.
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: 2010-10-14 13:30
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#149) Achieved points (Global score) y-m-d - h:m:s

Nobody (nobody) 200 (40618) 2010-10-14 13:35:59
Dennis Nolte (JokerX) 200 (6177) 2010-10-14 17:00:31
Simon Jakob (simon.jakob) 200 (18714) 2010-10-15 01:32:19
No you (lolwhat) 133 (2124) 2010-10-16 19:17:36
#5 Nabb (Nabb) 133 (13670) 2010-10-16 19:18:04
#6 Michael Winter (Isaenforcer) 125 (250) 2010-10-18 02:46:24
#7 Robin Parker (thehe) 125 (350) 2010-10-18 04:14:37
#8 Ralf Stephan (rwst) 120 (22735) 2010-10-18 16:54:42
#9 Michael Fischer (MichaelF) 120 (973) 2010-10-19 01:08:24
#10 J Br (j.br) 117 (3242) 2010-10-19 13:55:59
#11 Sebastian Steinmann (teodoc) 117 (5594) 2010-10-19 21:30:14
#12 Anibal Kürekci (ak187) 114 (1076) 2010-10-20 14:40:41
#13 Carsten Lenz (kAyCeE80) 111 (460) 2010-10-22 13:43:40
#14 Grinse Katze (Grinsekatze) 111 (964) 2010-10-22 13:53:39
#15 Roadrunner (rr) 109 (12702) 2010-10-24 14:43:14
#16 Juan (kation) 108 (6113) 2010-10-26 07:36:21
#17 Armin Krauss (argh) 107 (175390) 2010-10-28 11:04:25
#18 Carsten Baum (crashti) 104 (1135) 2010-11-06 13:14:12
#19 Bernd Freise (Xanhem) 103 (1154) 2010-11-19 17:38:18
#20 Nils Achim Lacke (Babbage) 103 (618) 2010-11-20 15:51:51
#21 Roland Röder (roro) 101 (307) 2010-12-23 12:40:21
#22 David (aki321) 101 (27482) 2011-01-23 20:13:25
#23 Hans Rudolf (mutabor) 101 (3015) 2011-02-08 18:56:24
#24 Jay Bee (jaybee) 101 (1926) 2011-02-11 21:41:20
#25 Thomas Gonda (TomG) 101 (36291) 2011-03-10 20:46:54
#26 Arnold Sendler (Tschighor) 101 (1105) 2011-04-06 12:00:39
#27 Mike (mambrosio) 101 (303) 2011-04-07 18:53:30
#28 j.h. (haegarq) 101 (15252) 2011-04-28 12:28:13
#29 Egon Hamburger (Seehase) 101 (3445) 2011-04-28 14:09:48
#30 Wombat (Wombat) 101 (5822) 2011-04-30 11:40:00
#31 Marcin Zawadzki (harry007) 101 (3012) 2011-05-02 12:12:49
#32 Muendo (muendo) 100 (3501) 2011-05-09 06:24:20
#33 Daniel Fretwell (fretty) 100 (30107) 2011-06-27 11:50:55
#34 Seth Kintigh (DarkFibre) 100 (79471) 2011-07-15 17:47:06
#35 Hank (hanky) 100 (22859) 2011-07-27 14:48:44
#36 Stefan Haas (stef_the_chef) 100 (4329) 2011-07-27 19:47:59
#37 Dano (Dano) 100 (14610) 2011-07-29 23:42:59
#38 dbuq (dbuq) 100 (22762) 2011-09-05 17:21:38
#39 Viktor (Veselovský) 100 (142053) 2011-09-13 03:08:42
#40 J. M. (jomandi) 100 (113270) 2011-09-20 23:35:55
#41 Jay Kay (Merty) 100 (3726) 2011-09-28 16:49:05
#42 Thomas Mattel (Tom) 100 (2462) 2011-10-25 19:55:07
#43 Bart den Hartog (Bart13) 100 (118984) 2011-11-08 05:44:38
#44 Michal Musilek (mim3) 100 (1121) 2011-11-13 14:27:52
#45 Nathan (Witten) 100 (25326) 2011-12-09 22:58:27
#46 Mayuresh Anand (effort2break) 100 (8728) 2012-01-07 12:28:42
#47 Tom Tox (tox) 100 (17708) 2012-01-18 14:45:00
#48 John (johnstosh) 100 (4448) 2012-02-11 20:20:33
#49 John (Tiger) 100 (1505) 2012-02-17 21:44:43
#50 Hans Peter (hanspeter) 100 (52256) 2012-03-08 22:32:27
#51 Michael Gürtler (michaelg) 100 (4128) 2012-03-18 19:52:54
#52 Kurt Gebauer (Yokozuna) 100 (146278) 2012-03-19 01:46:12
#53 H. Lautenschlager (helmi) 100 (29022) 2012-04-24 20:17:09
#54 Dusan (xxdradus) 100 (40236) 2012-04-26 11:29:48
#55 George (Theofanidis) 100 (101521) 2012-05-22 11:42:51
#56 Thomas Lambert (lambert) 100 (35237) 2012-08-02 17:54:23
#57 E.T (Ertheb) 100 (70256) 2012-08-04 14:26:28
#58 Em Doulgerakis (Greko) 100 (124033) 2012-08-08 21:15:42
#59 Harry (Schwabenbambi) 100 (2409) 2012-09-14 11:40:26
#60 Benny (Kingombo) 100 (3663) 2012-09-30 23:28:55
#61 Martina (Nikita) 100 (3863) 2012-09-30 23:29:43
#62 ghjklty70 (ghjklty70) 100 (217) 2012-10-28 19:27:48
#63 KW (qwer*) 100 (13963) 2012-10-31 20:48:58
#64 George Ho (GeorgH) 100 (3095) 2012-11-24 07:13:38
#65 Julia Werdelmann (jw) 100 (10407) 2012-12-19 14:49:59
#66 Jan (Yazoh) 100 (1000) 2012-12-31 00:13:38
#67 Iain Sharp (WoodenHedgehog) 100 (2196) 2013-01-31 14:20:00
#68 kevin shaw (steggily) 100 (2298) 2013-01-31 14:23:36
#69 vanderguile (vanderguile) 100 (2916) 2013-03-15 06:19:30
#70 Hans Joachim Girulat (joregi) 100 (33493) 2013-04-03 10:36:46
#71 Ramon Rojas (superme) 100 (3409) 2013-04-28 21:31:19
#72 Jörg Schwarzwälder (secuso) 100 (2125) 2013-05-08 21:33:12
#73 n a (jarofyarr) 100 (1901) 2013-05-24 01:31:12
#74 Steve (Samacian) 100 (23804) 2013-06-24 05:30:02
#75 Luigi Tomelli (archstanton) 100 (108345) 2013-06-29 09:43:14
#76 Bernhard Gruber (bgr) 100 (22889) 2013-07-15 15:25:30
#77 Almut (problelmo) 100 (45992) 2013-07-16 23:59:20
#78 Philipp Hammer-Pohlau (phase2) 100 (17981) 2013-07-29 12:54:20
#79 zahir mohsen moradi (ariobarzan) 100 (99757) 2013-09-01 16:40:46
#80 Sebastian Kluge (zappo) 100 (1801) 2013-09-05 15:06:28
#81 Alexander (cruachan) 100 (16051) 2013-09-28 02:47:20
#82 Gergely Simon (george314) 100 (16555) 2013-10-01 23:09:22
#83 Claudi (bucaneros) 100 (701) 2013-10-06 21:21:17
#84 Paul (Octavius) 100 (100) 2013-12-03 18:11:38
#85 Brad (braddrew) 100 (15878) 2013-12-05 09:50:41
#86 Jim Gillogly (Scryer) 100 (21260) 2013-12-07 18:06:14
#87 George Lasry (george4096) 100 (292103) 2013-12-12 15:51:43
#88 Alain (Integral) 100 (207924) 2013-12-18 12:13:29
#89 Pavel (haw) 100 (22728) 2014-01-07 21:48:14
#90 Kim H. S. (tenchijin) 100 (25468) 2014-01-20 17:23:32
#91 Bertold (bk) 100 (9673) 2014-01-28 20:57:25
#92 Marcel (bene1512) 100 (20896) 2014-01-31 17:28:36
#93 Michael Möller (michaelm) 100 (169404) 2014-02-05 16:38:08
#94 Snake (snk) 100 (72164) 2014-03-13 17:25:24
#95 Karl Schutt (günter) 100 (41550) 2014-03-29 11:44:48
#96 Siggi Kraus (Kruxi) 100 (701) 2014-05-07 22:00:07
#97 Franzi (Pilzkönigin) 100 (100) 2014-05-08 11:55:54
#98 Tina (BTina) 100 (1500) 2014-06-01 02:26:11
#99 cesar (chapelo) 100 (300) 2014-06-11 22:30:30
#100 Julia Bernotat (El Greco ) 100 (81129) 2014-07-14 21:54:44
#101 Nariman (Linkf00fkY) 100 (100) 2014-07-24 21:50:41
#102 Robert (rm) 100 (56475) 2014-07-31 22:27:37
#103 Andreas Frerichs (Ossili) 100 (33266) 2014-08-31 14:05:23
#104 Peter Lustig (arsen) 100 (2838) 2014-09-02 12:56:08
#105 swe (swe) 100 (200) 2014-09-21 19:03:53
#106 Francisco Moraes (fmoraes) 100 (90044) 2014-11-03 21:54:09
#107 Tim Fink (Magellan) 100 (4876) 2014-12-06 11:06:51
#108 Kai Ludwig (TalentRaspel) 100 (15704) 2015-01-06 18:38:46
#109 Roland Schindler (dr.roland) 100 (403) 2015-01-13 01:11:37
#110 HolgerK (HolgerK) 100 (25776) 2015-01-22 22:32:46
#111 Rainer Zufall (kiekuk) 100 (56786) 2015-03-18 23:00:51
#112 Brian Kieslich (briank) 100 (6733) 2015-04-14 12:21:16
#113 Michael Ammon (Ammonym) 100 (7719) 2015-06-08 02:33:15
#114 Mark van Heeswijk (markvh) 100 (2600) 2015-07-11 14:37:30
#115 Tradecraft (Tradecraft) 100 (5540) 2015-07-17 15:53:45
#116 Erik (Erox) 100 (22651) 2015-08-02 18:41:29
#117 Sirius (Leznar) 100 (4552) 2015-09-22 18:08:22
#118 Alain Collignon (vexilla72) 100 (80184) 2015-10-12 09:07:56
#119 Joerg G. (SnifferMaster) 100 (17853) 2015-10-12 17:22:32
#120 A. Ranea (ranea) 100 (100) 2015-10-29 12:16:23
#121 A Romero (A. Romero) 100 (100) 2015-11-02 14:13:14
#122 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-18 11:09:27
#123 S (Zyphe) 100 (10461) 2015-11-25 20:52:39
#124 Peter (TomBombadil) 100 (3417) 2016-03-15 16:12:57
#125 Lennart (Penthesilea) 100 (4110) 2016-04-16 23:16:35
#126 Peter (Garnet) 100 (14234) 2016-05-03 20:45:49
#127 Norbert Biermann (Norbert) 100 (44430) 2016-07-28 08:55:49
#128 Chris Kolonko (ckolonko) 100 (900) 2016-08-21 22:28:21
#129 Dominik M. (Sgt. Pepper) 100 (87927) 2016-10-13 21:21:37
#130 Michael (FoM) 100 (34465) 2016-11-27 11:35:30
#131 Meine Registrierung (TryC3) 100 (6045) 2016-12-30 12:21:28
#132 Nofre Tete (noffi) 100 (21921) 2016-12-31 16:38:27
#133 Mir Dim (mir0soft) 100 (72404) 2017-03-14 13:11:17
#134 chris (c2) 100 (51973) 2017-03-29 23:45:45
#135 Daniel Walder (ibex) 100 (14372) 2017-04-16 23:10:18
#136 Danny Higgins (hamster147) 100 (21817) 2017-04-24 09:02:21
#137 sarah b (silva) 100 (12778) 2017-06-09 16:14:21
#138 D3d4lu5 (D3d4lu5) 100 (260853) 2017-06-13 13:21:27
#139 nimroth (nimroth cynthor) 100 (6021) 2017-11-23 19:50:35
#140 Julian (Lemmynator) 100 (16666) 2018-03-03 09:26:07
#141 Eric (ExAstris) 100 (26990) 2018-05-19 17:02:09
#142 Georgius Stolte (HazmatsFear) 100 (15671) 2018-06-07 21:09:05
#143 Lane Williams (planetlane) 100 (20524) 2018-06-14 19:58:59
#144 Random Dude (rnd) 100 (75797) 2018-07-30 01:51:41
#145 Bertolo (Bertolo) 100 (7167) 2019-01-01 11:17:49
#146 madness (madness) 100 (7976) 2019-02-13 04:47:31
#147 Pierre Robier (tripleedged) 100 (5916) 2019-02-18 21:57:47
#148 LoneWolf219 (LoneWolf219) 100 (12795) 2019-03-08 21:04:01
#149 Klaus Pulverer (kumaus) 100 (1001) 2019-03-13 16:36:12
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Alice's Birthday Party (Part 1)

[kitrub-01] - 230 users already solved this challenge, 14 are working on it.
 
 
 

Alice sends encrypted invitations for her birthday party to her friends. As it turns out, two of her friends use the same RSA parameter N. This fact allows an adversary Eve to decrypt the encrypted message without knowing the corresponding secret key.

Where does Alice's party take place? The codeword for this challenge is the location of Alice's party.
Read more...

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

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2010-10-14 13:30
Maximum number of attempts for this challenge: 20

All successful users of this challenge

Rank User (#230) Achieved points (Global score) y-m-d - h:m:s

Nobody (nobody) 2000 (40618) 2010-10-14 13:30:51
Dennis Nolte (JokerX) 1824 (6177) 2010-10-15 13:34:05
kyprizel (kyprizel) 1725 (20795) 2010-10-16 22:05:46
Nabb (Nabb) 1725 (13670) 2010-10-16 22:45:31
#5 No you (lolwhat) 1725 (2124) 2010-10-16 22:51:10
#6 Cezary Glowacz (cezaryglowacz) 1725 (9995) 2010-10-16 22:56:22
#7 Martin Wittiger (wittiger) 1725 (3450) 2010-10-17 01:09:30
#8 Thomas Schmucker (dg) 1725 (26066) 2010-10-17 10:37:39
#9 Claude Laveaux (claude.laveaux) 1660 (14504) 2010-10-17 21:37:37
#10 Simon Jakob (simon.jakob) 1613 (18714) 2010-10-18 19:08:33
#11 Ralf Stephan (rwst) 1613 (22735) 2010-10-18 20:06:25
#12 Michał Bartoszkiewicz (embe) 1576 (3269) 2010-10-20 02:14:53
#13 Roadrunner (rr) 1502 (12702) 2010-10-22 20:06:25
#14 piler (piler) 1433 (2818) 2010-10-27 16:25:03
#15 Armin Krauss (argh) 1433 (175390) 2010-10-27 22:56:37
#16 Christian (Etschupu) 1406 (31788) 2010-10-30 17:02:04
#17 Juan (kation) 1398 (6113) 2010-10-31 22:58:42
#18 Ulrich Armbrüster (uarmbruester) 1398 (7987) 2010-11-01 11:06:25
#19 mischa (mmisc) 1391 (22426) 2010-11-01 22:58:24
#20 Stefan Kühne (subROUTINE) 1353 (3595) 2010-11-08 17:13:44
#21 Ilya Ozerov (ilya) 1337 (20556) 2010-11-12 19:50:36
#22 chris (iceace) 1268 (2536) 2010-12-14 20:48:02
#23 Sabrina W. (sabrina) 1266 (2532) 2010-12-15 23:41:48
#24 S. N. (Tig3r) 1252 (2504) 2010-12-27 22:51:20
#25 Thomas Gonda (TomG) 1244 (36291) 2011-01-05 18:14:41
#26 Andrea Kolberger (akolberger) 1237 (1237) 2011-01-13 12:49:06
#27 Markus H. (maxxh) 1237 (3728) 2011-01-13 19:08:42
#28 Erik Rusek (Rusk) 1234 (3717) 2011-01-17 20:35:35
#29 Thomas Pfeiffer (hackfleisch) 1234 (1234) 2011-01-17 23:57:37
#30 David (aki321) 1227 (27482) 2011-01-27 17:32:57
#31 Wolfgang Weisser (wowmyst) 1222 (33108) 2011-02-03 20:19:46
#32 Fabian Bendun (benfa) 1210 (8697) 2011-02-26 22:50:35
#33 Alan Dixon (NickBourbaki) 1208 (7761) 2011-03-05 02:21:51
#34 RashmiSheetal (rashmisheetal) 1206 (2411) 2011-03-08 20:33:33
#35 J. M. (jomandi) 1180 (113270) 2011-06-02 19:10:43
#36 Daniel Fretwell (fretty) 1176 (30107) 2011-06-20 14:53:37
#37 Seth Kintigh (DarkFibre) 1170 (79471) 2011-07-19 06:11:40
#38 Peter Mustermann (Gummiboot) 1170 (60285) 2011-07-23 12:41:23
#39 Viktor (Veselovský) 1168 (142053) 2011-07-30 23:35:19
#40 Dano (Dano) 1167 (14610) 2011-08-09 10:17:12
#41 Nicolas Golubovic (qll) 1165 (14919) 2011-08-20 21:43:33
#42 dbuq (dbuq) 1165 (22762) 2011-08-21 03:00:32
#43 The Killer (Killer) 1165 (42393) 2011-08-22 00:28:33
#44 h3po (h3po) 1164 (20433) 2011-08-22 19:19:17
#45 Cleyton Muto (accepted_rush) 1164 (5578) 2011-08-24 18:19:33
#46 Flip (Flip) 1164 (31107) 2011-08-28 18:10:22
#47 Robbt Neid (Das Tupel) 1163 (9403) 2011-09-02 20:34:40
#48 Roland Jansen (roland) 1161 (17607) 2011-09-19 12:04:15
#49 Anton Wendel (MoD) 1159 (5679) 2011-09-29 21:30:29
#50 Thomas Lambert (lambert) 1158 (35237) 2011-10-07 10:01:42
#51 Bart den Hartog (Bart13) 1154 (118984) 2011-11-14 23:50:00
#52 Keith Randall (randall77) 1151 (31011) 2011-12-07 00:07:23
#53 Flo Geht_dich gar_nichts_an (flo) 1151 (6271) 2011-12-11 18:20:40
#54 Nathan (Witten) 1151 (25326) 2011-12-11 20:04:44
#55 Jan Temme (JaT3) 1150 (11694) 2011-12-22 17:26:45
#56 Mayuresh Anand (effort2break) 1148 (8728) 2012-01-06 19:27:50
#57 John (johnstosh) 1147 (4448) 2012-01-23 05:20:09
#58 Luigi Tomelli (archstanton) 1145 (108345) 2012-02-11 18:27:59
#59 Michel Van Caneghem (vancan) 1145 (49719) 2012-02-12 11:38:11
#60 Martin Härterich (HaeM) 1145 (15149) 2012-02-13 16:13:18
#61 Hans Peter (hanspeter) 1144 (52256) 2012-02-19 00:22:15
#62 Lukas (Kahla) 1144 (4719) 2012-02-29 03:10:35
#63 freelancer (freelancertryme) 1142 (1142) 2012-03-16 19:10:27
#64 mallika (perepamallika) 1142 (2284) 2012-03-16 19:14:43
#65 snigdha (snigdha) 1142 (2284) 2012-03-23 06:55:30
#66 Kurt Gebauer (Yokozuna) 1141 (146278) 2012-03-29 01:09:36
#67 Steluta P. (maty_star) 1140 (5734) 2012-04-12 01:59:38
#68 Aliazer (Aliazer) 1139 (12314) 2012-04-26 22:02:46
#69 Daniel Demmler (dd23) 1139 (8942) 2012-04-29 14:22:49
#70 Moi (MSTinaFlow) 1139 (2979) 2012-05-03 17:48:45
#71 captp (bdcht) 1138 (5864) 2012-05-10 14:26:19
#72 Dusan (xxdradus) 1138 (40236) 2012-05-19 11:59:42
#73 George (Theofanidis) 1137 (101521) 2012-05-31 08:41:33
#74 chris_3stones (3stones) 1136 (37759) 2012-06-10 13:07:55
#75 zuben c3 (zuben-c3) 1135 (24853) 2012-06-28 15:33:40
#76 Em Doulgerakis (Greko) 1134 (124033) 2012-07-13 16:11:46
#77 Stepan (m1sterx) 1133 (19165) 2012-07-31 14:59:28
#78 scout (Scout) 1131 (2368) 2012-09-08 03:01:07
#79 RPH (derichard) 1130 (27044) 2012-09-15 13:34:33
#80 vas (pet) 1130 (8197) 2012-09-23 20:12:36
#81 Hank (hanky) 1130 (22859) 2012-09-24 19:43:10
#82 Hannes (Hartmann) 1130 (8680) 2012-09-25 15:15:23
#83 E.T (Ertheb) 1128 (70256) 2012-10-25 19:03:20
#84 Lukas Juhrich (ljuhrich) 1128 (5453) 2012-11-03 22:09:04
#85 Lakshmi Ananthagopal (lakshmi87) 1128 (2256) 2012-11-04 06:21:34
#86 The Enigma (enigma) 1128 (14336) 2012-11-09 19:46:54
#87 Eugene (ZhekaS) 1128 (6037) 2012-11-11 01:16:17
#88 Friedrich Wiemer (asante) 1127 (5183) 2012-11-16 20:36:05
#89 Tron (Tron) 1126 (7381) 2012-12-22 15:21:06
#90 Julia Werdelmann (jw) 1126 (10407) 2012-12-22 23:09:00
#91 zahir mohsen moradi (ariobarzan) 1124 (99757) 2013-02-03 22:26:21
#92 mk (bilbobeutlin) 1122 (12340) 2013-03-19 19:45:47
#93 pb (pb) 1121 (1421) 2013-04-10 22:48:13
#94 Velko Nikolov (staafl) 1121 (13467) 2013-04-11 19:02:20
#95 Almut (problelmo) 1121 (45992) 2013-04-27 00:01:28
#96 Stefan (sdn) 1121 (5137) 2013-04-27 23:34:50
#97 Snake (snk) 1120 (72164) 2013-05-23 09:10:33
#98 Gergely Simon (george314) 1119 (16555) 2013-06-24 01:57:34
#99 Philipp Hammer-Pohlau (phase2) 1118 (17981) 2013-07-22 00:10:41
#100 masam (jimboo) 1117 (18687) 2013-08-15 21:42:35
#101 Forrest Gump (Polyphem) 1117 (38763) 2013-08-27 13:16:55
#102 Felix (Flix) 1117 (13712) 2013-08-27 17:06:10
#103 Steve (Samacian) 1116 (23804) 2013-09-05 05:24:16
#104 Alexander (cruachan) 1116 (16051) 2013-09-29 17:44:20
#105 Boris (Kaasu) 1115 (16566) 2013-10-18 18:37:06
#106 Swathi Pai (swathi3184) 1115 (3354) 2013-11-01 19:35:57
#107 Usha Narra (usha.narra) 1115 (2230) 2013-11-01 19:40:14
#108 Fengjiao (Fengjiao) 1115 (2230) 2013-11-07 19:01:29
#109 Steve (pairate) 1115 (2230) 2013-11-07 19:53:34
#110 Brad (braddrew) 1114 (15878) 2013-12-09 08:59:03
#111 Alain (Integral) 1113 (207924) 2013-12-27 16:47:26
#112 Lucas (veered) 1113 (2226) 2013-12-28 00:00:54
#113 jonathan (munz) 1113 (8954) 2013-12-29 23:30:52
#114 Csaba Fitzl (csaby) 1113 (6696) 2014-01-01 16:36:19
#115 Pavel (haw) 1113 (22728) 2014-01-15 20:37:25
#116 Michael Doucha (mdou) 1112 (13757) 2014-02-17 15:34:42
#117 Shoukat (e195633) 1111 (10617) 2014-03-02 01:03:05
#118 Kim H. S. (tenchijin) 1111 (25468) 2014-03-03 13:09:00
#119 Duy Khanh Dau (khanh45a3kct) 1111 (5783) 2014-03-11 00:00:04
#120 hellman (hellman) 1111 (14862) 2014-03-12 15:59:45
#121 caesar ([caesar]) 1111 (10738) 2014-03-23 22:47:27
#122 Karl Schutt (günter) 1111 (41550) 2014-03-30 15:54:47
#123 Igor (idipaolo) 1109 (10639) 2014-05-23 02:11:39
#124 Francisco Moraes (fmoraes) 1109 (90044) 2014-07-03 21:41:19
#125 Manfred Wurm (Tschabobo) 1108 (8835) 2014-07-14 10:18:20
#126 Peter (51dc30ddc) 1108 (10916) 2014-07-23 22:29:14
#127 julius gaius (julius) 1108 (25581) 2014-07-27 21:25:24
#128 baz (oneiron) 1108 (12353) 2014-07-30 04:45:25
#129 Robert (rm) 1108 (56475) 2014-07-31 22:17:25
#130 Christof B. (beans90) 1108 (9488) 2014-08-11 15:07:28
#131 Alex (toincogni) 1107 (5055) 2014-09-22 16:38:00
#132 Konstantin (tempestadept) 1106 (3847) 2014-10-23 10:42:17
#133 manodivya kathiravan (manodivya) 1106 (2212) 2014-10-28 18:55:09
#134 P (newgirl21) 1106 (2212) 2014-11-08 06:31:53
#135 Javantea (Javantea) 1106 (40816) 2014-11-10 08:32:45
#136 Julia Bernotat (El Greco ) 1106 (81129) 2014-11-24 22:10:20
#137 Max Mustermann (MustermM) 1105 (6661) 2014-12-17 09:29:54
#138 Kai Ludwig (TalentRaspel) 1105 (15704) 2015-01-07 00:21:04
#139 AnirudhAnand (lucif3r) 1105 (5445) 2015-01-09 08:12:21
#140 Claude Vaillancourt (Cl3v3r) 1104 (38351) 2015-01-20 15:55:35
#141 Andreas Frerichs (Ossili) 1104 (33266) 2015-01-29 20:42:40
#142 Danny Higgins (hamster147) 1104 (21817) 2015-02-15 13:30:31
#143 Konstantin Golovan (SoulShaker) 1104 (14091) 2015-02-28 22:39:06
#144 Georgius Stolte (HazmatsFear) 1104 (15671) 2015-03-10 18:23:46
#145 R (r?) 1103 (6742) 2015-03-19 09:21:26
#146 Jeremy Chuang (jeremhh) 1103 (6643) 2015-03-19 13:28:23
#147 Rainer Zufall (kiekuk) 1103 (56786) 2015-04-01 09:45:27
#148 Brian Kieslich (briank) 1103 (6733) 2015-04-07 23:15:48
#149 oxylius (oxylius) 1103 (1404) 2015-04-14 20:28:06
#150 S (Dingo_the_BB) 1103 (6534) 2015-04-15 11:19:47
#151 D (devilchn) 1102 (11142) 2015-06-14 14:24:18
#152 Matthias Kotzerke (Esdeath) 1102 (4004) 2015-06-20 18:33:20
#153 Erik (Erox) 1101 (22651) 2015-07-15 19:31:45
#154 J-L Morel (Rossignol) 1101 (29125) 2015-07-29 10:31:02
#155 Sean (Kavanaugh) 1101 (29143) 2015-08-13 20:06:58
#156 Kokx (kokx) 1101 (4810) 2015-09-07 10:28:42
#157 Joerg G. (SnifferMaster) 1100 (17853) 2015-10-04 17:09:12
#158 Alain Collignon (vexilla72) 1100 (80184) 2015-10-08 12:24:58
#159 S Combes (jerva) 1100 (99132) 2015-10-24 19:14:43
#160 Martin (martinbucher) 1100 (27363) 2015-11-08 15:30:34
#161 Szabó Zoltán (szabo.z87) 1100 (55604) 2015-11-10 07:19:39
#162 Rainer (Rainer74) 1099 (8417) 2015-12-21 19:05:06
#163 Dominik M. (Sgt. Pepper) 1099 (87927) 2015-12-22 01:13:23
#164 T (Wagner) 1099 (16887) 2015-12-26 17:50:00
#165 Casaubon (cfreuden) 1099 (8515) 2016-01-13 12:53:16
#166 Vilius (wi_lius) 1098 (3497) 2016-02-13 20:41:11
#167 Ader (Vert) 1098 (2496) 2016-02-29 17:01:27
#168 Marco Manfredi (mkk9901) 1098 (17686) 2016-03-14 12:26:51
#169 Peter (Garnet) 1098 (14234) 2016-03-16 09:39:06
#170 Norbert Biermann (Norbert) 1096 (44430) 2016-07-05 19:30:59
#171 Ho Chung Siu (soarerz) 1096 (5314) 2016-07-06 06:34:09
#172 Vlatiha Romanova (Vlatiha) 1096 (10323) 2016-08-02 16:40:00
#173 CESH (cesh) 1096 (4995) 2016-08-18 19:42:09
#174 Wieland (wisch) 1096 (6633) 2016-08-19 18:50:01
#175 Flo (sealth) 1096 (13472) 2016-08-22 02:35:58
#176 Sandeep (SandeepM22) 1095 (1095) 2016-09-22 03:04:39
#177 Nicolas (nicosPavlov) 1095 (151166) 2016-09-29 13:26:00
#178 neko (neko) 1095 (7679) 2016-11-20 04:36:08
#179 Wall (Hadrian) 1095 (4098) 2016-11-21 15:05:35
#180 JoGo (JoGo) 1095 (11686) 2016-12-01 19:52:33
#181 Marcel (bene1512) 1094 (20896) 2017-01-07 15:25:24
#182 Michael (FoM) 1094 (34465) 2017-01-24 12:41:51
#183 Tristan1473 (Tristan1473) 1094 (18914) 2017-02-10 11:56:07
#184 Hans Joachim Girulat (joregi) 1094 (33493) 2017-02-18 00:09:23
#185 Mir Dim (mir0soft) 1093 (72404) 2017-03-12 12:56:41
#186 chris (c2) 1093 (51973) 2017-03-14 10:06:45
#187 Vaidotas (Hurrislt) 1093 (3579) 2017-03-21 11:59:45
#188 Daniel Walder (ibex) 1093 (14372) 2017-04-11 21:39:47
#189 Nico (Nico_n) 1093 (1293) 2017-04-21 13:46:18
#190 Joel (joelhdzhdz) 1093 (3288) 2017-05-25 07:50:13
#191 john doe (misio) 1093 (7371) 2017-05-30 11:33:05
#192 Kasia (kasia-tutej) 1093 (53366) 2017-05-30 11:42:45
#193 Mihail (plexor) 1093 (16827) 2017-06-03 12:35:25
#194 Imam Uasa (Merricx) 1092 (9188) 2017-06-12 05:41:46
#195 D3d4lu5 (D3d4lu5) 1092 (260853) 2017-06-12 08:55:12
#196 NGUYEN Ngoc Ky (kynguyenngoc) 1092 (4974) 2017-06-18 15:58:12
#197 Akonia (Akonia12) 1092 (12153) 2017-07-16 16:31:21
#198 Moomin (Mushmom) 1092 (7674) 2017-07-19 12:09:09
#199 George Lasry (george4096) 1092 (292103) 2017-08-01 20:16:17
#200 juw (juw) 1092 (4179) 2017-08-11 10:38:04
#201 Immo Weber (MandelToast) 1092 (10061) 2017-08-19 16:26:27
#202 Julian (Lemmynator) 1092 (16666) 2017-09-15 21:26:42
#203 S (sshahab) 1091 (1091) 2017-10-08 07:17:44
#204 Dmitry Eremin-Solenikov (lumag) 1091 (4482) 2017-10-16 14:27:46
#205 Tom Tox (tox) 1090 (17708) 2018-03-11 16:42:09
#206 Max (maxguo1) 1090 (1090) 2018-03-13 21:52:19
#207 Nofre Tete (noffi) 1090 (21921) 2018-03-15 01:21:30
#208 Steve Vaillancourt (stvai2) 1089 (15041) 2018-05-11 00:46:30
#209 Silvia Kortmann (mikinsget) 1089 (10104) 2018-05-15 22:35:47
#210 Eric (ExAstris) 1089 (26990) 2018-05-17 00:19:11
#211 Christophe BORELLY (cb34) 1089 (12358) 2018-06-05 21:01:59
#212 Durward McDonell (durward) 1089 (5265) 2018-06-12 22:10:13
#213 E41514010 (E41514010) 1089 (1389) 2018-07-04 11:41:15
#214 E41514013 (E41514013) 1089 (4167) 2018-07-04 11:43:53
#215 E41514023 (E41514023) 1089 (3967) 2018-07-04 12:50:03
#216 Lane Williams (planetlane) 1089 (20524) 2018-07-13 22:19:31
#217 Random Dude (rnd) 1089 (75797) 2018-08-03 16:49:40
#218 Ranee Oscar (roscar2018) 1088 (2176) 2018-09-06 06:15:20
#219 Abhishek Manoj Sharma (abhishekmsharma) 1088 (1088) 2018-09-23 11:49:56
#220 Manfred Paul (manf) 1088 (14774) 2018-11-13 23:56:15
#221 eschar (eschar) 1087 (3264) 2019-01-21 19:08:25
#222 Rolfe Bozier (rolfe) 1087 (4769) 2019-02-09 21:23:37
#223 simone (xseris) 1087 (8432) 2019-02-15 21:03:07
#224 LoneWolf219 (LoneWolf219) 1087 (12795) 2019-02-25 01:19:01
#225 whitecowboy (whitecowboy) 1087 (7346) 2019-03-06 12:26:32
#226 E41614011 (E41614011) 1087 (2775) 2019-03-08 08:28:08
#227 E41614046 (E41614046) 1087 (2775) 2019-03-08 10:06:07
#228 E41614047 (E41614047) 1087 (1187) 2019-03-08 10:44:19
#229 E41614031 (E41614031) 1087 (6338) 2019-03-09 17:58:57
#230 Lia (Lia) 1087 (6855) 2019-03-11 21:12:15
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Alice's Birthday Party (Part 2)

[kitrub-02] - 216 users already solved this challenge, 2 are working on it.
 
 
 

Alice has learned from her mistake from last year. This year, she makes sure that the friends to whom she sends invitations for her birthday party all use unique RSA N parameters. However, this time she still makes another mistake that allows an adversary, Eve, to reconstruct the message.

Can you again decrypt this year's invitation? The codeword for this challenge is the location of Alice's party.
Read more...

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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2010-10-14 13:30
Maximum number of attempts for this challenge: 20

All successful users of this challenge

Rank User (#216) Achieved points (Global score) y-m-d - h:m:s

Nobody (nobody) 2000 (40618) 2010-10-14 13:31:45
kyprizel (kyprizel) 1725 (20795) 2010-10-16 20:00:25
Nabb (Nabb) 1725 (13670) 2010-10-16 23:25:58
Cezary Glowacz (cezaryglowacz) 1725 (9995) 2010-10-16 23:53:15
#5 Martin Wittiger (wittiger) 1725 (3450) 2010-10-17 01:48:28
#6 Simon Jakob (simon.jakob) 1613 (18714) 2010-10-18 19:43:09
#7 Ralf Stephan (rwst) 1613 (22735) 2010-10-19 09:52:51
#8 Thomas Schmucker (dg) 1576 (26066) 2010-10-19 18:27:11
#9 Ulrich Dürholz (Uli) 1576 (1576) 2010-10-20 01:09:49
#10 Michał Bartoszkiewicz (embe) 1576 (3269) 2010-10-20 02:24:25
#11 Dennis Nolte (JokerX) 1502 (6177) 2010-10-22 17:01:26
#12 Roadrunner (rr) 1502 (12702) 2010-10-22 22:33:10
#13 Claude Laveaux (claude.laveaux) 1469 (14504) 2010-10-24 14:26:31
#14 Armin Krauss (argh) 1433 (175390) 2010-10-27 22:59:10
#15 Christian (Etschupu) 1406 (31788) 2010-10-30 17:02:30
#16 mischa (mmisc) 1406 (22426) 2010-10-30 18:25:49
#17 Juan (kation) 1398 (6113) 2010-11-01 01:27:03
#18 piler (piler) 1385 (2818) 2010-11-03 02:47:11
#19 David (aki321) 1378 (27482) 2010-11-03 14:48:25
#20 Stefan Kühne (subROUTINE) 1353 (3595) 2010-11-09 10:58:39
#21 Ilya Ozerov (ilya) 1327 (20556) 2010-11-15 22:29:28
#22 Ulrich Armbrüster (uarmbruester) 1321 (7987) 2010-11-17 17:48:48
#23 chris (iceace) 1268 (2536) 2010-12-14 22:40:35
#24 Sabrina W. (sabrina) 1266 (2532) 2010-12-15 23:42:07
#25 S. N. (Tig3r) 1252 (2504) 2010-12-27 21:55:31
#26 Thomas Gonda (TomG) 1244 (36291) 2011-01-05 18:16:42
#27 Markus H. (maxxh) 1237 (3728) 2011-01-13 19:09:13
#28 Erik Rusek (Rusk) 1234 (3717) 2011-01-17 20:02:34
#29 Wolfgang Weisser (wowmyst) 1229 (33108) 2011-01-25 03:04:37
#30 Fabian Bendun (benfa) 1210 (8697) 2011-02-27 22:22:19
#31 Alan Dixon (NickBourbaki) 1209 (7761) 2011-03-02 22:14:07
#32 RashmiSheetal (rashmisheetal) 1205 (2411) 2011-03-10 20:16:23
#33 Gayathri (gaayaathrees) 1205 (1205) 2011-03-11 04:37:47
#34 Sandhya (sandy_crypto) 1205 (1205) 2011-03-11 04:48:13
#35 J. M. (jomandi) 1180 (113270) 2011-06-02 18:56:34
#36 Daniel Fretwell (fretty) 1176 (30107) 2011-06-20 15:29:19
#37 Seth Kintigh (DarkFibre) 1170 (79471) 2011-07-21 07:27:13
#38 Peter Mustermann (Gummiboot) 1169 (60285) 2011-07-23 15:03:41
#39 Viktor (Veselovský) 1168 (142053) 2011-07-31 00:03:42
#40 Dano (Dano) 1167 (14610) 2011-08-09 10:51:39
#41 Nicolas Golubovic (qll) 1165 (14919) 2011-08-20 21:15:06
#42 dbuq (dbuq) 1165 (22762) 2011-08-21 12:45:42
#43 The Killer (Killer) 1165 (42393) 2011-08-22 00:17:46
#44 h3po (h3po) 1164 (20433) 2011-08-22 20:19:21
#45 Cleyton Muto (accepted_rush) 1164 (5578) 2011-08-25 00:16:13
#46 Flip (Flip) 1164 (31107) 2011-08-28 18:52:33
#47 Robbt Neid (Das Tupel) 1163 (9403) 2011-09-02 20:34:54
#48 Roland Jansen (roland) 1160 (17607) 2011-09-20 14:51:14
#49 Anton Wendel (MoD) 1159 (5679) 2011-09-30 12:53:31
#50 Thomas Lambert (lambert) 1158 (35237) 2011-10-08 12:02:03
#51 Bart den Hartog (Bart13) 1153 (118984) 2011-11-16 02:55:44
#52 Keith Randall (randall77) 1151 (31011) 2011-12-07 00:16:13
#53 Nathan (Witten) 1151 (25326) 2011-12-11 20:36:33
#54 Flo Geht_dich gar_nichts_an (flo) 1150 (6271) 2011-12-14 16:12:36
#55 Jan Temme (JaT3) 1150 (11694) 2011-12-22 17:33:19
#56 John (johnstosh) 1146 (4448) 2012-02-03 02:40:22
#57 Michel Van Caneghem (vancan) 1145 (49719) 2012-02-12 11:52:32
#58 Martin Härterich (HaeM) 1145 (15149) 2012-02-13 17:18:44
#59 Hans Peter (hanspeter) 1144 (52256) 2012-02-19 01:21:30
#60 Luigi Tomelli (archstanton) 1144 (108345) 2012-02-20 10:55:10
#61 Lukas (Kahla) 1143 (4719) 2012-02-29 15:14:20
#62 mallika (perepamallika) 1142 (2284) 2012-03-16 23:34:17
#63 snigdha (snigdha) 1142 (2284) 2012-03-23 06:59:43
#64 Kurt Gebauer (Yokozuna) 1141 (146278) 2012-03-27 01:52:17
#65 Steluta P. (maty_star) 1140 (5734) 2012-04-14 02:15:16
#66 Aliazer (Aliazer) 1139 (12314) 2012-04-26 22:20:07
#67 Daniel Demmler (dd23) 1139 (8942) 2012-04-29 14:50:24
#68 Moi (MSTinaFlow) 1139 (2979) 2012-05-03 19:24:24
#69 captp (bdcht) 1138 (5864) 2012-05-10 22:46:54
#70 Dusan (xxdradus) 1138 (40236) 2012-05-19 07:00:59
#71 George (Theofanidis) 1137 (101521) 2012-05-31 00:24:07
#72 chris_3stones (3stones) 1136 (37759) 2012-06-10 12:41:05
#73 zuben c3 (zuben-c3) 1135 (24853) 2012-06-27 13:37:01
#74 Em Doulgerakis (Greko) 1134 (124033) 2012-07-12 10:53:05
#75 Stepan (m1sterx) 1131 (19165) 2012-09-06 08:45:44
#76 RPH (derichard) 1130 (27044) 2012-09-16 12:40:14
#77 vas (pet) 1130 (8197) 2012-09-23 21:01:29
#78 Hank (hanky) 1130 (22859) 2012-09-25 21:55:59
#79 Hannes (Hartmann) 1130 (8680) 2012-09-25 22:47:33
#80 scout (Scout) 1129 (2368) 2012-10-12 04:55:08
#81 E.T (Ertheb) 1128 (70256) 2012-10-25 20:53:33
#82 Lakshmi Ananthagopal (lakshmi87) 1128 (2256) 2012-11-04 06:27:34
#83 The Enigma (enigma) 1128 (14336) 2012-11-09 20:53:42
#84 Eugene (ZhekaS) 1128 (6037) 2012-11-11 02:00:41
#85 Friedrich Wiemer (asante) 1127 (5183) 2012-11-16 16:50:37
#86 Tron (Tron) 1126 (7381) 2012-12-22 16:48:01
#87 Julia Werdelmann (jw) 1126 (10407) 2012-12-23 00:09:33
#88 zahir mohsen moradi (ariobarzan) 1124 (99757) 2013-02-03 22:47:19
#89 mk (bilbobeutlin) 1122 (12340) 2013-03-19 20:31:23
#90 Velko Nikolov (staafl) 1121 (13467) 2013-04-11 23:21:51
#91 Almut (problelmo) 1121 (45992) 2013-04-27 08:03:33
#92 Philipp Hammer-Pohlau (phase2) 1118 (17981) 2013-07-22 11:22:49
#93 masam (jimboo) 1117 (18687) 2013-08-17 01:43:14
#94 Forrest Gump (Polyphem) 1117 (38763) 2013-08-27 16:06:20
#95 Felix (Flix) 1117 (13712) 2013-08-27 18:16:41
#96 Steve (Samacian) 1116 (23804) 2013-09-05 06:14:13
#97 Gergely Simon (george314) 1116 (16555) 2013-09-27 20:49:54
#98 Alexander (cruachan) 1116 (16051) 2013-09-28 19:48:46
#99 Snake (snk) 1115 (72164) 2013-10-07 16:13:00
#100 Boris (Kaasu) 1115 (16566) 2013-10-18 18:57:48
#101 Swathi Pai (swathi3184) 1115 (3354) 2013-11-01 19:33:40
#102 Usha Narra (usha.narra) 1115 (2230) 2013-11-01 20:28:21
#103 Steve (pairate) 1115 (2230) 2013-11-03 22:40:52
#104 Fengjiao (Fengjiao) 1115 (2230) 2013-11-07 19:05:09
#105 Brad (braddrew) 1114 (15878) 2013-12-09 10:34:55
#106 Lucas (veered) 1113 (2226) 2013-12-28 10:58:36
#107 Alain (Integral) 1113 (207924) 2013-12-28 16:27:05
#108 jonathan (munz) 1113 (8954) 2013-12-30 22:54:06
#109 Csaba Fitzl (csaby) 1113 (6696) 2014-01-01 19:34:29
#110 Pavel (haw) 1113 (22728) 2014-01-12 19:31:51
#111 Michael Doucha (mdou) 1112 (13757) 2014-02-17 18:10:12
#112 Duy Khanh Dau (khanh45a3kct) 1111 (5783) 2014-03-11 00:06:26
#113 hellman (hellman) 1111 (14862) 2014-03-12 16:23:00
#114 caesar ([caesar]) 1111 (10738) 2014-03-23 22:53:52
#115 Karl Schutt (günter) 1111 (41550) 2014-03-30 17:34:31
#116 Igor (idipaolo) 1109 (10639) 2014-05-23 02:39:18
#117 Michael (pheenyx) 1109 (3840) 2014-05-23 21:51:34
#118 Francisco Moraes (fmoraes) 1109 (90044) 2014-07-05 05:29:35
#119 Manfred Wurm (Tschabobo) 1108 (8835) 2014-07-14 10:32:36
#120 julius gaius (julius) 1108 (25581) 2014-07-21 09:01:13
#121 Peter (51dc30ddc) 1108 (10916) 2014-07-23 23:05:35
#122 Robert (rm) 1108 (56475) 2014-07-31 22:18:25
#123 baz (oneiron) 1108 (12353) 2014-08-05 03:12:20
#124 Christof B. (beans90) 1108 (9488) 2014-08-16 17:11:46
#125 Alex (toincogni) 1107 (5055) 2014-09-22 22:34:36
#126 manodivya kathiravan (manodivya) 1106 (2212) 2014-10-28 18:58:46
#127 Samyuktha Tina (samyusridhar) 1106 (2218) 2014-11-07 20:08:56
#128 P (newgirl21) 1106 (2212) 2014-11-08 06:37:36
#129 Javantea (Javantea) 1106 (40816) 2014-11-11 03:42:46
#130 Julia Bernotat (El Greco ) 1106 (81129) 2014-11-26 01:00:48
#131 AnirudhAnand (lucif3r) 1105 (5445) 2015-01-09 09:17:23
#132 Kai Ludwig (TalentRaspel) 1105 (15704) 2015-01-10 16:19:05
#133 Claude Vaillancourt (Cl3v3r) 1104 (38351) 2015-01-20 15:56:55
#134 Shoukat (e195633) 1104 (10617) 2015-01-31 01:09:08
#135 Danny Higgins (hamster147) 1104 (21817) 2015-02-15 16:16:23
#136 Konstantin Golovan (SoulShaker) 1104 (14091) 2015-03-01 17:10:34
#137 R (r?) 1103 (6742) 2015-03-19 10:16:46
#138 Jeremy Chuang (jeremhh) 1103 (6643) 2015-03-19 13:32:28
#139 Rainer Zufall (kiekuk) 1103 (56786) 2015-04-01 10:15:15
#140 Brian Kieslich (briank) 1103 (6733) 2015-04-14 03:57:06
#141 S (Dingo_the_BB) 1103 (6534) 2015-04-15 21:20:18
#142 D (devilchn) 1102 (11142) 2015-06-14 21:45:04
#143 Erik (Erox) 1101 (22651) 2015-07-15 22:19:48
#144 J-L Morel (Rossignol) 1101 (29125) 2015-07-29 14:06:20
#145 Sean (Kavanaugh) 1101 (29143) 2015-08-13 20:08:19
#146 Kokx (kokx) 1101 (4810) 2015-09-07 13:56:44
#147 Ylona (Sirene) 1101 (4425) 2015-09-07 14:26:48
#148 Joerg G. (SnifferMaster) 1100 (17853) 2015-10-04 17:52:25
#149 Alain Collignon (vexilla72) 1100 (80184) 2015-10-08 11:07:52
#150 S Combes (jerva) 1100 (99132) 2015-10-24 20:29:53
#151 Martin (martinbucher) 1100 (27363) 2015-11-09 15:27:42
#152 Szabó Zoltán (szabo.z87) 1100 (55604) 2015-11-10 07:29:42
#153 Rainer (Rainer74) 1099 (8417) 2015-12-21 19:06:00
#154 Dominik M. (Sgt. Pepper) 1099 (87927) 2015-12-22 02:54:08
#155 T (Wagner) 1099 (16887) 2015-12-26 15:58:02
#156 Casaubon (cfreuden) 1099 (8515) 2016-01-13 15:28:13
#157 Vilius (wi_lius) 1098 (3497) 2016-02-14 12:53:46
#158 Andreas Frerichs (Ossili) 1098 (33266) 2016-02-17 19:11:02
#159 Ader (Vert) 1098 (2496) 2016-02-29 17:07:12
#160 Marco Manfredi (mkk9901) 1098 (17686) 2016-03-14 14:25:51
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#162 Norbert Biermann (Norbert) 1096 (44430) 2016-07-05 22:32:23
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#164 Vlatiha Romanova (Vlatiha) 1096 (10323) 2016-08-03 13:59:43
#165 CESH (cesh) 1096 (4995) 2016-08-18 20:13:56
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#171 JoGo (JoGo) 1095 (11686) 2016-12-02 17:05:15
#172 Marcel (bene1512) 1094 (20896) 2017-01-07 19:02:11
#173 Michael (FoM) 1094 (34465) 2017-01-25 02:09:41
#174 Georgius Stolte (HazmatsFear) 1094 (15671) 2017-02-08 18:57:20
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#176 Hans Joachim Girulat (joregi) 1094 (33493) 2017-02-25 19:40:49
#177 Mir Dim (mir0soft) 1093 (72404) 2017-03-12 14:37:52
#178 chris (c2) 1093 (51973) 2017-03-14 10:30:52
#179 Vaidotas (Hurrislt) 1093 (3579) 2017-03-21 15:49:11
#180 Daniel Walder (ibex) 1093 (14372) 2017-04-11 21:45:10
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#182 john doe (misio) 1093 (7371) 2017-05-30 11:53:18
#183 Kasia (kasia-tutej) 1093 (53366) 2017-05-30 11:57:26
#184 Mihail (plexor) 1093 (16827) 2017-06-03 14:57:16
#185 D3d4lu5 (D3d4lu5) 1092 (260853) 2017-06-12 18:34:06
#186 Imam Uasa (Merricx) 1092 (9188) 2017-06-13 16:11:56
#187 NGUYEN Ngoc Ky (kynguyenngoc) 1092 (4974) 2017-06-18 18:14:11
#188 Akonia (Akonia12) 1092 (12153) 2017-07-16 16:38:47
#189 Moomin (Mushmom) 1092 (7674) 2017-07-19 13:47:03
#190 George Lasry (george4096) 1092 (292103) 2017-08-01 20:21:32
#191 juw (juw) 1092 (4179) 2017-08-11 10:54:58
#192 Immo Weber (MandelToast) 1092 (10061) 2017-08-19 18:15:32
#193 Kim H. S. (tenchijin) 1092 (25468) 2017-08-23 15:28:54
#194 Julian (Lemmynator) 1092 (16666) 2017-09-16 14:40:04
#195 Dmitry Eremin-Solenikov (lumag) 1091 (4482) 2017-10-16 15:40:39
#196 Tom Tox (tox) 1090 (17708) 2018-03-14 12:44:21
#197 Nofre Tete (noffi) 1090 (21921) 2018-03-16 16:53:06
#198 Steve Vaillancourt (stvai2) 1089 (15041) 2018-05-11 02:06:08
#199 Eric (ExAstris) 1089 (26990) 2018-05-17 02:15:07
#200 Silvia Kortmann (mikinsget) 1089 (10104) 2018-05-17 02:28:40
#201 Christophe BORELLY (cb34) 1089 (12358) 2018-06-06 09:16:16
#202 Durward McDonell (durward) 1089 (5265) 2018-06-13 17:56:41
#203 E41514050 (E41514050) 1089 (3870) 2018-07-07 11:30:30
#204 E41514023 (E41514023) 1089 (3967) 2018-07-07 15:00:55
#205 E41514013 (E41514013) 1089 (4167) 2018-07-08 09:57:01
#206 E41514006 (E41514006) 1089 (4957) 2018-07-08 10:09:58
#207 Lane Williams (planetlane) 1089 (20524) 2018-07-13 22:32:14
#208 Random Dude (rnd) 1089 (75797) 2018-08-07 02:01:25
#209 Ranee Oscar (roscar2018) 1088 (2176) 2018-09-06 07:10:46
#210 Steven Yen (styen510) 1088 (1088) 2018-10-09 22:10:15
#211 Manfred Paul (manf) 1088 (14774) 2018-11-14 00:01:22
#212 simone (xseris) 1087 (8432) 2019-02-16 10:59:08
#213 Lia (Lia) 1087 (6855) 2019-03-06 00:43:24
#214 whitecowboy (whitecowboy) 1087 (7346) 2019-03-06 13:11:55
#215 LoneWolf219 (LoneWolf219) 1087 (12795) 2019-03-08 02:48:40
#216 E41614031 (E41614031) 1087 (6338) 2019-03-10 13:11:59
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D'Agapeyeff

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In 1939, the Russian-born Briton Alexander D'Agapeyeff published a book named "Codes and Ciphers". This book contains a ciphertext that was meant as an exercise. So far, nobody has been able to decrypt this ciphertext. In later editions of his book, this exercise was omitted – possibly because he had forgotten the solution himself. D'Agapeyeff may have made a mistake during the encryption procedure, which makes it now difficult to find the cleartext.
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Published on: 2010-10-14 13:30
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Dorabella

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In 1897, the English composer Edward Elgar sent an encrypted message to a lover. So far, nobody has been able to decrypt it. This message is known today as the "Dorabella Cipher".
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Published on: 2010-10-14 13:30
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   +++    [00:10 - 20.03.2019] gduncan solved the Level I challenge 'Caesar Encryption'    +++    [21:06 - 19.03.2019] gduncan solved the Level I challenge 'Number Sequence — Part 2'    +++    [21:00 - 19.03.2019] gduncan solved the Level I challenge 'Original Caesar Cipher'    +++    [20:30 - 19.03.2019] gduncan solved the Level I challenge 'Number Sequence'    +++    [19:35 - 19.03.2019] hanspeteryoo solved the Level I challenge 'Number Sequence — Part 2'    +++