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 (292)

Ordered by date posted, the most recent appear first.

Pigpen with a twist — Part 2

[fretwell-02] - 36 users already solved this challenge, 4 are working on it.
 
 
 

Can you break the cipher without knowing the substitution? But in return you know that a periodic rotation key has been used.
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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: 2011-09-02 13:11
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#36) Achieved points (Global score) y-m-d - h:m:s

Seth Kintigh (DarkFibre) 1576 (79471) 2011-09-07 17:13:42
Armin Krauss (argh) 1576 (188214) 2011-09-07 19:46:18
David (aki321) 1456 (27482) 2011-09-13 19:37:31
Viktor (Veselovský) 1423 (155163) 2011-09-17 00:59:53
#5 J. M. (jomandi) 1344 (113270) 2011-09-29 20:07:23
#6 Peter Mustermann (Gummiboot) 1238 (60285) 2011-11-30 12:23:54
#7 Bart den Hartog (Bart13) 1180 (144081) 2012-04-19 12:01:49
#8 Aliazer (Aliazer) 1178 (12314) 2012-04-25 21:02:18
#9 Kurt Gebauer (Yokozuna) 1171 (177433) 2012-06-03 23:37:08
#10 Dusan (xxdradus) 1161 (40236) 2012-08-01 12:29:08
#11 Hans Peter (hanspeter) 1150 (52256) 2012-11-08 17:15:03
#12 E.T (Ertheb) 1131 (81809) 2013-07-30 21:02:20
#13 zahir mohsen moradi (ariobarzan) 1128 (99757) 2013-09-15 16:14:24
#14 Ismeet Kaur Makkar (ismeettkaur) 1126 (1626) 2013-10-26 21:19:37
#15 vimal (vimalkumarsinghal) 1126 (1126) 2013-10-26 21:32:40
#16 George (Theofanidis) 1126 (112184) 2013-10-28 11:38:05
#17 Alain (Integral) 1123 (207924) 2014-01-20 18:29:38
#18 Em Doulgerakis (Greko) 1121 (124033) 2014-03-02 18:49:02
#19 julius gaius (julius) 1116 (25581) 2014-08-20 11:36:07
#20 Julia Bernotat (El Greco ) 1115 (81129) 2014-09-04 15:32:43
#21 Francisco Moraes (fmoraes) 1113 (90044) 2014-11-18 19:58:02
#22 Pavel (haw) 1112 (22728) 2014-12-16 14:03:43
#23 chris_3stones (3stones) 1112 (37759) 2015-01-13 20:13:45
#24 Hans Joachim Girulat (joregi) 1108 (36278) 2015-06-24 20:03:58
#25 Alain Collignon (vexilla72) 1105 (90800) 2015-11-19 18:50:07
#26 Szabó Zoltán (szabo.z87) 1105 (55604) 2015-12-01 10:36:58
#27 Snake (snk) 1105 (83889) 2015-12-01 15:38:54
#28 Joerg G. (SnifferMaster) 1105 (18154) 2015-12-01 18:20:06
#29 Robert (rm) 1102 (56475) 2016-04-23 01:14:18
#30 Norbert Biermann (Norbert) 1100 (45031) 2016-09-14 22:22:22
#31 Nicolas (nicosPavlov) 1099 (151166) 2016-11-22 11:22:53
#32 George Lasry (george4096) 1096 (302230) 2017-08-01 11:45:35
#33 D3d4lu5 (D3d4lu5) 1095 (297709) 2017-08-26 01:48:22
#34 Dominik M. (Sgt. Pepper) 1093 (97919) 2018-03-23 20:18:54
#35 madness (madness) 1090 (15407) 2019-02-14 22:10:58
#36 Random Dude (rnd) 1089 (90929) 2019-04-24 00:10:24
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Modified Caesar Cipher

[veselovsky-03] - 191 users already solved this challenge, 43 are working on it.
 
 
 

The Caesar Chiper is rather simple. But in this challenge it is used with a different alphabet and a modified way of shifting the letters.
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: 2011-09-02 13:02
Maximum number of attempts for this challenge: 20

All successful users of this challenge

Rank User (#191) Achieved points (Global score) y-m-d - h:m:s

David (aki321) 200 (27482) 2011-09-02 15:54:58
dbuq (dbuq) 200 (22762) 2011-09-02 16:05:13
Daniel Fretwell (fretty) 200 (30107) 2011-09-02 16:25:15
Michael Möller (michaelm) 200 (175129) 2011-09-02 20:39:42
#5 The Killer (Killer) 200 (42393) 2011-09-02 23:58:37
#6 Seth Kintigh (DarkFibre) 200 (79471) 2011-09-03 02:04:23
#7 Armin Krauss (argh) 200 (188214) 2011-09-03 09:48:06
#8 Wombat (Wombat) 133 (5822) 2011-09-05 02:09:48
#9 Roland Jansen (roland) 125 (17607) 2011-09-05 19:08:49
#10 j.h. (haegarq) 125 (15252) 2011-09-05 22:52:19
#11 Dano (Dano) 120 (14610) 2011-09-06 15:50:18
#12 Christof Kleber (Loki) 120 (6051) 2011-09-07 10:51:27
#13 Nicolas Golubovic (qll) 113 (14919) 2011-09-09 23:52:49
#14 Thomas Gonda (TomG) 109 (36291) 2011-09-12 21:51:39
#15 Dennis Walter (Lotus) 106 (6827) 2011-09-18 07:03:26
#16 J. M. (jomandi) 105 (113270) 2011-09-21 00:04:40
#17 Anton Wendel (MoD) 104 (5679) 2011-09-28 14:04:37
#18 h3po (h3po) 104 (20433) 2011-09-28 20:47:54
#19 Thomas Mattel (Tom) 103 (2462) 2011-10-09 08:51:43
#20 JR (grosronan) 103 (307) 2011-10-09 21:58:18
#21 Bart den Hartog (Bart13) 102 (144081) 2011-11-04 16:13:02
#22 Nathan (Witten) 101 (25326) 2011-12-06 13:05:29
#23 Wade Burch (Braernoch) 101 (1308) 2011-12-07 06:30:39
#24 Mathew Brown (browni3141) 101 (807) 2011-12-09 06:06:48
#25 Flo Geht_dich gar_nichts_an (flo) 101 (6271) 2011-12-13 15:56:02
#26 John Willemse (Melting Brains) 101 (1316) 2011-12-14 11:09:34
#27 Michael Gürtler (michaelg) 101 (4128) 2011-12-14 18:28:41
#28 Jascha Koch (yosh) 101 (2201) 2012-01-02 21:58:08
#29 André Koch-Kramer (FriF1) 101 (602) 2012-01-05 19:04:58
#30 Martin Härterich (HaeM) 101 (15149) 2012-01-31 15:31:58
#31 J Br (j.br) 101 (3242) 2012-02-21 16:39:12
#32 John (Tiger) 101 (1505) 2012-02-21 21:02:35
#33 Michal Ambroz (xambroz) 101 (2810) 2012-02-28 05:19:20
#34 Lukas (Kahla) 101 (4719) 2012-03-01 01:43:41
#35 E.T (Ertheb) 101 (81809) 2012-03-08 21:03:05
#36 Hans Peter (hanspeter) 101 (52256) 2012-03-09 12:38:50
#37 Dusan (xxdradus) 100 (40236) 2012-04-08 14:49:02
#38 H. Lautenschlager (helmi) 100 (32947) 2012-04-16 13:42:18
#39 Kurt Gebauer (Yokozuna) 100 (177433) 2012-04-16 23:24:13
#40 Michel Van Caneghem (vancan) 100 (49719) 2012-04-28 17:31:12
#41 Luigi Tomelli (archstanton) 100 (108345) 2012-05-03 18:36:06
#42 Fabian Bendun (benfa) 100 (8697) 2012-05-05 17:18:37
#43 Thomas Lambert (lambert) 100 (35237) 2012-05-06 13:24:15
#44 John (johnstosh) 100 (4448) 2012-05-24 04:15:16
#45 George (Theofanidis) 100 (112184) 2012-05-25 19:40:50
#46 zuben c3 (zuben-c3) 100 (24853) 2012-06-02 22:24:14
#47 Daniel Richter (TheHiveMind) 100 (11147) 2012-06-12 23:06:04
#48 Ralf Stephan (rwst) 100 (25229) 2012-06-23 13:07:27
#49 Bernd Klimaschewski (cryptonoob) 100 (1003) 2012-07-02 21:22:36
#50 Peter Grosse-Hering (Peter) 100 (8097) 2012-07-04 19:41:40
#51 Em Doulgerakis (Greko) 100 (124033) 2012-07-06 09:08:05
#52 P (PP65477) 100 (700) 2012-07-08 14:29:27
#53 KW (qwer*) 100 (13963) 2012-07-08 14:30:29
#54 Hank (hanky) 100 (22859) 2012-08-26 22:03:41
#55 Deepak Raja N (deepakincredible) 100 (621) 2012-08-27 16:33:09
#56 RPH (derichard) 100 (27044) 2012-09-03 02:35:58
#57 Annie (Annanasss) 100 (6813) 2012-09-12 15:43:41
#58 Benny (Kingombo) 100 (3663) 2012-09-24 19:35:38
#59 Martina (Nikita) 100 (3863) 2012-09-25 20:35:41
#60 Lukas Juhrich (ljuhrich) 100 (5453) 2012-11-03 20:34:30
#61 Julia Werdelmann (jw) 100 (10407) 2012-11-13 00:50:36
#62 Joe R (iceclown) 100 (2272) 2013-01-09 02:32:08
#63 zahir mohsen moradi (ariobarzan) 100 (99757) 2013-01-25 21:55:34
#64 Ramses (Ramses II) 100 (1924) 2013-02-02 23:20:20
#65 Mayuresh Anand (effort2break) 100 (8728) 2013-03-23 22:03:01
#66 Muendo (muendo) 100 (3501) 2013-03-29 20:10:20
#67 Hans Joachim Girulat (joregi) 100 (36278) 2013-04-03 18:42:57
#68 Velko Nikolov (staafl) 100 (13467) 2013-04-09 20:26:54
#69 Ramon Rojas (superme) 100 (3409) 2013-04-17 16:14:41
#70 Snake (snk) 100 (83889) 2013-05-21 07:42:11
#71 n a (jarofyarr) 100 (1901) 2013-05-24 02:46:23
#72 Felix (Flix) 100 (13712) 2013-05-24 22:22:38
#73 Bernhard Gruber (bgr) 100 (22889) 2013-06-19 09:06:19
#74 Steve (Samacian) 100 (23804) 2013-06-20 13:16:40
#75 Gergely Simon (george314) 100 (16555) 2013-06-25 16:40:24
#76 Almut (problelmo) 100 (45992) 2013-07-23 00:05:22
#77 Philipp Hammer-Pohlau (phase2) 100 (17981) 2013-07-23 14:03:51
#78 Forrest Gump (Polyphem) 100 (38763) 2013-07-28 16:17:47
#79 Vlatiha Romanova (Vlatiha) 100 (10323) 2013-07-30 23:30:02
#80 Gianluca Andriolo (Andriolo) 100 (3900) 2013-08-26 08:56:06
#81 Alexander (cruachan) 100 (16051) 2013-09-06 03:44:37
#82 George Lasry (george4096) 100 (302230) 2013-09-09 16:17:18
#83 Erich (ErichSt) 100 (4862) 2013-09-25 15:09:22
#84 David (Youhei) 100 (200) 2013-10-08 17:53:10
#85 Boris (Kaasu) 100 (16566) 2013-10-19 21:48:34
#86 Stefan Kühne (subROUTINE) 100 (3595) 2013-11-22 17:21:09
#87 Jim Gillogly (Scryer) 100 (21260) 2013-12-08 06:57:21
#88 Francisco Moraes (fmoraes) 100 (90044) 2013-12-14 15:39:06
#89 Alain (Integral) 100 (207924) 2013-12-17 09:54:03
#90 Brad (braddrew) 100 (15878) 2013-12-19 08:10:44
#91 Csaba Fitzl (csaby) 100 (6696) 2013-12-31 17:44:17
#92 Kim H. S. (tenchijin) 100 (25468) 2014-01-02 11:39:50
#93 Pavel (haw) 100 (22728) 2014-01-12 00:04:44
#94 Lutz Sittinger (Kryptolutz) 100 (1802) 2014-01-12 15:42:52
#95 Marcel (bene1512) 100 (20896) 2014-02-05 23:09:43
#96 Karl Schutt (günter) 100 (41550) 2014-04-05 23:03:46
#97 Luca (jellyluke) 100 (2140) 2014-04-20 01:34:01
#98 Igor (idipaolo) 100 (10639) 2014-05-15 11:41:31
#99 Tina (BTina) 100 (1500) 2014-06-01 06:10:23
#100 Manfred Wurm (Tschabobo) 100 (8835) 2014-06-16 15:41:54
#101 baz (oneiron) 100 (12353) 2014-07-09 08:07:50
#102 Julia Bernotat (El Greco ) 100 (81129) 2014-07-16 20:33:53
#103 julius gaius (julius) 100 (25581) 2014-07-21 13:42:06
#104 Hughes (hughes) 100 (7925) 2014-07-24 10:20:39
#105 Egon Hamburger (Seehase) 100 (3746) 2014-07-30 08:50:47
#106 Robert (rm) 100 (56475) 2014-07-31 22:25:52
#107 Peter Lustig (arsen) 100 (2838) 2014-09-09 12:05:57
#108 Javantea (Javantea) 100 (40816) 2014-10-11 06:56:31
#109 Señor Saturn (senorsaturn) 100 (3344) 2014-10-22 22:22:52
#110 jej (stationz) 100 (4939) 2014-11-14 14:39:01
#111 HolgerK (HolgerK) 100 (25776) 2014-11-22 17:46:27
#112 Tim Fink (Magellan) 100 (4876) 2014-12-18 21:33:24
#113 Claude Vaillancourt (Cl3v3r) 100 (38351) 2014-12-31 18:40:52
#114 Kai Ludwig (TalentRaspel) 100 (15704) 2015-01-05 07:25:07
#115 Danny Higgins (hamster147) 100 (34088) 2015-01-08 14:46:22
#116 micaman (micaman) 100 (4634) 2015-02-15 02:33:35
#117 Rainer Zufall (kiekuk) 100 (56786) 2015-03-03 20:11:29
#118 Andreas Frerichs (Ossili) 100 (33266) 2015-03-04 16:23:00
#119 Konstantin Golovan (SoulShaker) 100 (14091) 2015-03-08 11:44:34
#120 Philippe ALLARD (Flobert) 100 (4035) 2015-03-14 00:06:11
#121 Brian Kieslich (briank) 100 (6733) 2015-04-09 02:36:09
#122 Lane Williams (planetlane) 100 (23948) 2015-04-26 21:16:43
#123 Michael Ammon (Ammonym) 100 (7719) 2015-06-03 23:51:44
#124 chris_3stones (3stones) 100 (37759) 2015-07-04 22:23:20
#125 Mark van Heeswijk (markvh) 100 (2600) 2015-07-08 16:09:20
#126 Erik (Erox) 100 (26141) 2015-07-16 18:54:30
#127 Tradecraft (Tradecraft) 100 (5540) 2015-08-03 21:03:05
#128 partamier (yann) 100 (5635) 2015-08-20 15:52:28
#129 Joerg G. (SnifferMaster) 100 (18154) 2015-09-19 18:05:43
#130 Alain Collignon (vexilla72) 100 (90800) 2015-09-29 09:25:20
#131 J-L Morel (Rossignol) 100 (29425) 2015-10-03 16:21:44
#132 Martin (martinbucher) 100 (27363) 2015-10-24 14:55:59
#133 S (Zyphe) 100 (10461) 2015-11-01 17:26:32
#134 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-06 11:29:03
#135 T (Wagner) 100 (16988) 2015-12-30 21:29:40
#136 Marc (rcll0891) 100 (24004) 2016-01-17 22:53:13
#137 Nofre Tete (noffi) 100 (21921) 2016-02-01 23:57:49
#138 Fabian (XP-72) 100 (3707) 2016-02-21 13:01:28
#139 Marco Manfredi (mkk9901) 100 (17686) 2016-02-27 01:12:10
#140 Peter (Garnet) 100 (14234) 2016-03-10 08:57:08
#141 Dominik M. (Sgt. Pepper) 100 (97919) 2016-03-19 01:21:59
#142 Norbert Biermann (Norbert) 100 (45031) 2016-07-08 16:35:46
#143 Flo (sealth) 100 (13472) 2016-08-22 18:32:42
#144 Daniel Walder (ibex) 100 (14372) 2016-10-13 17:10:11
#145 Julian (Lemmynator) 100 (17953) 2016-11-11 16:41:31
#146 Simon Jakob (simon.jakob) 100 (18714) 2016-11-27 12:17:24
#147 Nicolas (nicosPavlov) 100 (151166) 2016-12-07 15:23:10
#148 Michael (FoM) 100 (38953) 2016-12-16 16:12:05
#149 Meine Registrierung (TryC3) 100 (6045) 2016-12-27 14:14:07
#150 chris (c2) 100 (51973) 2017-02-28 17:35:59
#151 Mir Dim (mir0soft) 100 (72404) 2017-03-13 12:06:51
#152 sarah b (silva) 100 (26264) 2017-04-02 11:40:19
#153 Kai Fischell (MrFlector) 100 (1433) 2017-04-02 22:40:08
#154 Mihail (plexor) 100 (16827) 2017-06-04 07:36:58
#155 D3d4lu5 (D3d4lu5) 100 (297709) 2017-06-10 06:58:12
#156 Michael Jeffrey (empjay) 100 (3004) 2017-06-16 21:43:55
#157 NGUYEN Ngoc Ky (kynguyenngoc) 100 (4974) 2017-06-24 09:48:11
#158 Moomin (Mushmom) 100 (7674) 2017-07-19 20:43:49
#159 Immo Weber (MandelToast) 100 (10061) 2017-08-13 20:40:47
#160 Gaston (ggaston095) 100 (100) 2017-08-26 14:19:38
#161 nimroth (nimroth cynthor) 100 (6021) 2017-11-18 17:45:24
#162 tamisrah (tamisrah) 100 (3134) 2018-03-20 02:44:18
#163 Christian Inci (ch100) 100 (9253) 2018-05-01 15:37:09
#164 Allisat (psychohasii) 100 (4356) 2018-05-03 08:32:34
#165 Eric (ExAstris) 100 (26990) 2018-05-18 20:52:57
#166 Benjamin (200611736) 100 (10186) 2018-06-02 18:21:24
#167 Simon Kirchner (Twistios) 100 (3088) 2018-06-14 19:09:11
#168 Random Dude (rnd) 100 (90929) 2018-06-24 20:20:12
#169 Clemens (16dombrowski) 100 (5136) 2018-12-16 00:12:19
#170 Piotr (lesnik7) 100 (8171) 2019-01-12 17:12:53
#171 Joe Doe (tr_joedoe) 100 (1600) 2019-01-22 15:43:48
#172 César (Kaskade) 100 (1794) 2019-02-28 14:09:02
#173 LoneWolf219 (LoneWolf219) 100 (12795) 2019-03-08 00:25:56
#174 Lia (Lia) 100 (6855) 2019-03-12 20:34:09
#175 Mike (RogueRamblers) 100 (29805) 2019-03-15 19:04:38
#176 Piyush Agarwal (Piyushgrwl) 100 (4795) 2019-03-21 06:59:46
#177 madness (madness) 100 (15407) 2019-04-03 05:28:52
#178 Klaus (kumaus) 100 (21415) 2019-04-03 16:48:56
#179 Sebastian Slupina (Grandwizard) 100 (10866) 2019-04-04 22:33:52
#180 Darchicourt (Darki) 100 (3308) 2019-04-12 09:54:30
#181 Christian (MarquisDeSud) 100 (7848) 2019-04-16 14:32:32
#182 whitecowboy (whitecowboy) 100 (7446) 2019-04-17 20:39:16
#183 Jeff (Fountain) 100 (8788) 2019-05-31 19:56:06
#184 ENOENT (ENOENT) 100 (13478) 2019-06-01 19:18:32
#185 Stephan (Stephje1978) 100 (26961) 2019-06-20 23:32:09
#186 mighty_maharaja (mighty_maharaja) 100 (2592) 2019-06-25 20:11:54
#187 yult (yult) 100 (12185) 2019-07-11 20:33:52
#188 gerdw (gerdw) 100 (28315) 2019-07-11 21:53:19
#189 ajg (ludimus) 100 (11914) 2019-07-23 12:53:10
#190 Dr. Peter Uelkes (RandyWaterhouse) 100 (9990) 2019-07-28 11:18:44
#191 Eugene (lim0n) 100 (55054) 2019-09-14 16:26:46
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Unusual encryption using a diophantine equation

[veselovsky-01] - 55 users already solved this challenge, 3 are working on it.
 
 
 

In order to calculate the private keys of the RSA algorithm, it is necessary to factorize large numbers. How difficult is it if we replace x*y by some diophantine equation?
Read more...

Click here to get to the corresponding forum topic to share your opinion.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2011-09-02 12:57
Maximum number of attempts for this challenge: 20

All successful users of this challenge

Rank User (#55) Achieved points (Global score) y-m-d - h:m:s

Daniel Fretwell (fretty) 2000 (30107) 2011-09-02 17:57:42
The Killer (Killer) 2000 (42393) 2011-09-02 22:53:54
Armin Krauss (argh) 2000 (188214) 2011-09-02 23:05:49
Seth Kintigh (DarkFibre) 2000 (79471) 2011-09-03 01:48:33
#5 mischa (mmisc) 1725 (22426) 2011-09-05 00:47:09
#6 kyprizel (kyprizel) 1613 (20795) 2011-09-07 11:26:53
#7 J. M. (jomandi) 1547 (113270) 2011-09-08 17:22:49
#8 Peter Mustermann (Gummiboot) 1469 (60285) 2011-09-12 19:11:06
#9 Keith Randall (randall77) 1237 (31011) 2011-12-03 06:15:08
#10 Nathan (Witten) 1229 (25326) 2011-12-13 12:25:12
#11 Flo Geht_dich gar_nichts_an (flo) 1229 (6271) 2011-12-14 11:29:10
#12 Bart den Hartog (Bart13) 1202 (144081) 2012-02-05 02:46:39
#13 Luigi Tomelli (archstanton) 1200 (108345) 2012-02-09 13:35:14
#14 Michel Van Caneghem (vancan) 1199 (49719) 2012-02-12 09:08:42
#15 Christian (Etschupu) 1164 (31788) 2012-07-11 10:24:23
#16 Thomas Lambert (lambert) 1158 (35237) 2012-08-27 09:49:27
#17 Hank (hanky) 1152 (22859) 2012-10-21 06:14:26
#18 Kurt Gebauer (Yokozuna) 1147 (177433) 2012-12-08 18:06:24
#19 Em Doulgerakis (Greko) 1132 (124033) 2013-07-14 11:38:22
#20 Felix (Flix) 1129 (13712) 2013-08-29 23:34:11
#21 zahir mohsen moradi (ariobarzan) 1128 (99757) 2013-09-14 10:26:56
#22 Alain (Integral) 1123 (207924) 2014-01-14 16:59:44
#23 George (Theofanidis) 1122 (112184) 2014-02-05 20:13:14
#24 Ralf Stephan (rwst) 1122 (25229) 2014-02-09 08:30:05
#25 hellman (hellman) 1121 (14862) 2014-03-13 10:15:36
#26 Thomas Schmucker (dg) 1118 (26066) 2014-05-25 08:33:26
#27 baz (oneiron) 1116 (12353) 2014-08-13 04:29:13
#28 julius gaius (julius) 1115 (25581) 2014-08-29 10:46:47
#29 Francisco Moraes (fmoraes) 1113 (90044) 2014-11-10 19:48:37
#30 Julia Bernotat (El Greco ) 1111 (81129) 2015-02-03 18:02:49
#31 Erik (Erox) 1107 (26141) 2015-08-01 16:19:49
#32 Sean (Kavanaugh) 1106 (29143) 2015-09-06 16:26:08
#33 Szabó Zoltán (szabo.z87) 1105 (55604) 2015-11-05 14:57:42
#34 S Combes (jerva) 1105 (99132) 2015-11-05 20:37:26
#35 Robert (rm) 1105 (56475) 2015-12-07 14:01:15
#36 Rainer Zufall (kiekuk) 1103 (56786) 2016-03-29 12:12:07
#37 Dominik M. (Sgt. Pepper) 1100 (97919) 2016-10-05 23:55:24
#38 Nicolas (nicosPavlov) 1099 (151166) 2016-11-18 07:38:36
#39 Martin (martinbucher) 1098 (27363) 2017-01-02 16:13:34
#40 Tristan1473 (Tristan1473) 1098 (18914) 2017-01-22 09:40:26
#41 chris (c2) 1097 (51973) 2017-04-26 16:10:50
#42 T (Wagner) 1097 (16988) 2017-04-30 23:58:02
#43 Kasia (kasia-tutej) 1096 (53366) 2017-06-05 18:11:05
#44 D3d4lu5 (D3d4lu5) 1096 (297709) 2017-07-14 18:36:14
#45 George Lasry (george4096) 1095 (302230) 2017-08-06 00:43:00
#46 Hajoe (Tintin-Muc) 1095 (6923) 2017-08-20 23:42:13
#47 E.T (Ertheb) 1093 (81809) 2018-02-18 21:08:24
#48 Snake (snk) 1092 (83889) 2018-07-16 16:40:47
#49 Random Dude (rnd) 1091 (90929) 2018-10-13 02:35:30
#50 kilink (kilink) 1090 (8053) 2018-11-18 21:49:22
#51 Klaus (kumaus) 1089 (21415) 2019-04-04 16:16:56
#52 Marco Cinelli (Snap) 1089 (28365) 2019-05-15 14:23:41
#53 Eugene (lim0n) 1089 (55054) 2019-06-01 14:17:38
#54 gerdw (gerdw) 1088 (28315) 2019-07-24 22:41:03
#55 Danny Higgins (hamster147) 1088 (34088) 2019-08-18 22:28:47
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Digital Signatures: DSA with Medium Fields

[lange-01] - 0 users already solved this challenge.
 
 
 

This challenge concerns the Discrete Logarithm Problem (DLP) in a "medium" field.
For powers of very small primes and for large prime fields the function-field sieve and the number-field sieve are highly optimized; for intermediate fields algorithms with the same asymptotic behavior exist but the actual running times are slower. Are you able to solve the DLP in such a field anyway?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2011-09-02 12:23
Maximum number of attempts for this challenge: 20

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ADFGVX — Part 2

[simon-02] - 103 users already solved this challenge, 6 are working on it.
 
 
 

A pair of plaintext and the corresponding ciphertext encrypted with the ADFGVX cipher ist given. Can you reveal the substitution and transposition key used in this example?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2011-08-15 17:14
Maximum number of attempts for this challenge: 99

All successful users of this challenge

Rank User (#103) Achieved points (Global score) y-m-d - h:m:s

Seth Kintigh (DarkFibre) 200 (79471) 2011-08-15 22:52:12
Daniel Fretwell (fretty) 200 (30107) 2011-08-15 23:37:52
Viktor (Veselovský) 200 (155163) 2011-08-16 03:13:11
dbuq (dbuq) 200 (22762) 2011-08-16 11:32:37
#5 Armin Krauss (argh) 200 (188214) 2011-08-16 14:24:13
#6 J. M. (jomandi) 150 (113270) 2011-08-16 17:56:23
#7 Holti (Holti) 125 (6035) 2011-08-18 21:12:35
#8 Dano (Dano) 120 (14610) 2011-08-20 01:32:07
#9 David (aki321) 117 (27482) 2011-08-21 00:49:50
#10 Michael Möller (michaelm) 114 (175129) 2011-08-22 17:06:13
#11 Wombat (Wombat) 105 (5822) 2011-09-04 16:19:00
#12 Christof Kleber (Loki) 103 (6051) 2011-09-15 14:52:07
#13 Dennis Walter (Lotus) 103 (6827) 2011-09-18 04:04:55
#14 Anton Wendel (MoD) 102 (5679) 2011-09-28 17:21:47
#15 Victoria Fehr (Rika) 102 (1472) 2011-10-10 09:16:48
#16 Bart den Hartog (Bart13) 101 (144081) 2011-11-09 00:49:33
#17 Michal Musilek (mim3) 101 (1121) 2011-11-20 14:51:10
#18 Volker Simon (vosi) 101 (202) 2011-11-22 17:33:49
#19 Annie (Annanasss) 101 (6813) 2011-11-24 22:05:59
#20 Wade Burch (Braernoch) 101 (1308) 2011-12-07 20:14:58
#21 Peter Mustermann (Gummiboot) 101 (60285) 2011-12-30 22:48:06
#22 Tom Tox (tox) 101 (17708) 2012-01-26 19:41:00
#23 George (Theofanidis) 101 (112184) 2012-02-20 11:04:08
#24 Ulrich Dorobeck (Papageno) 101 (3827) 2012-02-20 15:08:36
#25 J Br (j.br) 101 (3242) 2012-02-24 16:15:31
#26 Kurt Gebauer (Yokozuna) 100 (177433) 2012-03-07 20:54:22
#27 Hans Peter (hanspeter) 100 (52256) 2012-03-08 19:48:31
#28 Dusan (xxdradus) 100 (40236) 2012-05-22 18:36:27
#29 Michel Van Caneghem (vancan) 100 (49719) 2012-06-15 21:15:16
#30 Luigi Tomelli (archstanton) 100 (108345) 2012-06-19 11:12:07
#31 Em Doulgerakis (Greko) 100 (124033) 2012-07-21 19:13:40
#32 chris_3stones (3stones) 100 (37759) 2012-07-26 07:49:10
#33 Stepan (m1sterx) 100 (19165) 2012-07-31 19:10:29
#34 KW (qwer*) 100 (13963) 2012-09-06 21:15:13
#35 Manfred Wurm (Tschabobo) 100 (8835) 2012-10-11 09:45:36
#36 Hannes (Hartmann) 100 (8680) 2012-10-15 21:43:56
#37 Sebastian Slupina (Grandwizard) 100 (10866) 2012-11-05 17:43:27
#38 Snake (snk) 100 (83889) 2013-02-02 18:53:12
#39 RPH (derichard) 100 (27044) 2013-04-10 21:12:56
#40 swarmspider (swarmspider) 100 (4528) 2013-04-25 09:30:22
#41 E.T (Ertheb) 100 (81809) 2013-05-22 20:54:49
#42 Almut (problelmo) 100 (45992) 2013-06-01 04:54:13
#43 Thomas Lambert (lambert) 100 (35237) 2013-06-16 15:46:49
#44 Bernhard Gruber (bgr) 100 (22889) 2013-06-26 15:57:48
#45 Hans Joachim Girulat (joregi) 100 (36278) 2013-07-07 19:50:26
#46 zahir mohsen moradi (ariobarzan) 100 (99757) 2013-07-08 07:58:14
#47 Philipp Hammer-Pohlau (phase2) 100 (17981) 2013-08-15 11:04:49
#48 Steve (Samacian) 100 (23804) 2013-08-20 04:37:02
#49 George Lasry (george4096) 100 (302230) 2013-08-20 22:46:50
#50 Alexander (cruachan) 100 (16051) 2013-10-26 21:07:58
#51 Boris (Kaasu) 100 (16566) 2013-11-06 10:21:47
#52 Alain (Integral) 100 (207924) 2013-12-28 19:47:48
#53 Bertold (bk) 100 (9673) 2013-12-31 18:00:00
#54 Marcel (bene1512) 100 (20896) 2014-02-09 19:08:37
#55 Karl Schutt (günter) 100 (41550) 2014-05-03 11:37:38
#56 Francisco Moraes (fmoraes) 100 (90044) 2014-07-01 18:00:16
#57 Robert (rm) 100 (56475) 2014-07-31 22:47:10
#58 Julia Bernotat (El Greco ) 100 (81129) 2014-08-03 13:26:25
#59 Pavel (haw) 100 (22728) 2014-12-06 22:05:56
#60 HolgerK (HolgerK) 100 (25776) 2015-01-16 19:37:40
#61 j.h. (haegarq) 100 (15252) 2015-01-22 08:17:21
#62 Andreas Frerichs (Ossili) 100 (33266) 2015-02-25 16:50:34
#63 S Combes (jerva) 100 (99132) 2015-03-11 20:39:27
#64 Vlatiha Romanova (Vlatiha) 100 (10323) 2015-04-09 12:52:56
#65 Rainer Zufall (kiekuk) 100 (56786) 2015-04-28 15:58:00
#66 Michael Ammon (Ammonym) 100 (7719) 2015-06-21 16:16:25
#67 Maria (julesjulchen) 100 (3019) 2015-07-20 11:59:07
#68 Alain Collignon (vexilla72) 100 (90800) 2015-10-11 13:35:25
#69 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-28 06:30:01
#70 Martin (martinbucher) 100 (27363) 2015-12-05 10:32:40
#71 S (Zyphe) 100 (10461) 2015-12-18 12:57:55
#72 Lane Williams (planetlane) 100 (23948) 2016-01-05 19:50:30
#73 Marc (rcll0891) 100 (24004) 2016-01-18 16:16:27
#74 Kerstin (Niam40) 100 (300) 2016-01-30 18:02:43
#75 Ines (bufo01) 100 (4515) 2016-03-02 19:41:28
#76 Peter (Garnet) 100 (14234) 2016-03-22 09:36:02
#77 Lennart (Penthesilea) 100 (4110) 2016-04-16 17:16:43
#78 Imam Uasa (Merricx) 100 (9188) 2016-05-17 20:49:50
#79 Norbert Biermann (Norbert) 100 (45031) 2016-07-16 19:31:12
#80 Dominik M. (Sgt. Pepper) 100 (97919) 2016-08-14 15:50:47
#81 Nicolas (nicosPavlov) 100 (151166) 2016-10-15 13:34:18
#82 zuben c3 (zuben-c3) 100 (24853) 2016-11-20 13:11:11
#83 Michael (FoM) 100 (38953) 2016-12-21 00:52:14
#84 Mir Dim (mir0soft) 100 (72404) 2017-03-22 21:54:22
#85 Julian (Lemmynator) 100 (17953) 2017-04-22 14:37:05
#86 chris (c2) 100 (51973) 2017-04-24 07:22:20
#87 Daniel Walder (ibex) 100 (14372) 2017-04-25 21:57:09
#88 D3d4lu5 (D3d4lu5) 100 (297709) 2017-06-21 12:33:01
#89 Tim Fink (Magellan) 100 (4876) 2017-06-29 05:32:18
#90 Immo Weber (MandelToast) 100 (10061) 2017-08-13 16:03:08
#91 Hajoe (Tintin-Muc) 100 (6923) 2017-09-10 09:45:16
#92 nimroth (nimroth cynthor) 100 (6021) 2017-12-25 00:10:34
#93 H. Lautenschlager (helmi) 100 (32947) 2018-01-03 22:44:30
#94 Pen (justtesting) 100 (1697) 2018-01-12 13:31:37
#95 Nofre Tete (noffi) 100 (21921) 2018-02-05 21:28:16
#96 Random Dude (rnd) 100 (90929) 2018-09-04 18:45:59
#97 sarah b (silva) 100 (26264) 2018-10-03 14:02:35
#98 Sergej Schalew (CryptoSolver) 100 (600) 2018-12-05 18:51:26
#99 Javantea (Javantea) 100 (40816) 2018-12-31 21:19:23
#100 Jeff (Fountain) 100 (8788) 2019-06-08 21:14:40
#101 Stephan (Stephje1978) 100 (26961) 2019-06-23 14:52:23
#102 Mike (RogueRamblers) 100 (29805) 2019-06-26 02:45:03
#103 Eugene (lim0n) 100 (55054) 2019-06-29 16:55:42
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   +++    [15:04 - 19.09.2019] lim0n solved the Level I challenge 'Molehunt (Part 1/3)'    +++    [13:37 - 19.09.2019] h4rdl0ck solved the Level II challenge 'Factorization Cipher — Part 2'    +++    [07:08 - 19.09.2019] Bart13 solved the Level II challenge 'Hilly — Part 1'    +++    [23:59 - 18.09.2019] Byqq!T3qmxxZfRir solved the Level I challenge 'Number Sequence'    +++    [14:21 - 18.09.2019] h4rdl0ck solved the Level I challenge 'Factorization Cipher — Part 1'    +++