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 (341)

Ordered by date posted, the most recent appear first.

Kryptos

[schmeh-05] - 0 users already solved this challenge.
 
 
 

Kryptos is a sculpture made by the US artist Jim Sanborn. It is located next to the headquarters of the CIA in Langley, VA. An encrypted message was written on the sculpture. The message consists of four independent parts.

The first three parts have been solved, but the fourth one has so far withstood every attempt at decryption.
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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: 0

All successful users of this challenge

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Not-so-Secret Message from Malawi — Part I (RSA)

[schaefer-01] - 186 users already solved this challenge, 4 are working on it.
 
 
 

When creating RSA keys, it is important to choose the n and e parameters wisely. This was not done in this example, and thus you should be able to decipher this ciphertext message sent from Malawi. The plaintext gives the codeword, which is related to the photo.
Read more...

Click here to get to the corresponding forum topic to share your opinion.
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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: 50

All successful users of this challenge

Rank User (#186) Achieved points (Global score) y-m-d - h:m:s

das (dasdas) 1725 (1925) 2010-10-17 12:25:10
Thomas Schmucker (dg) 1660 (26066) 2010-10-17 17:38:16
Cezary Glowacz (cezaryglowacz) 1660 (9995) 2010-10-17 21:51:03
kyprizel (kyprizel) 1660 (20795) 2010-10-18 06:51:50
#5 Mathias Herrmann (mazze) 1576 (3302) 2010-10-19 13:45:21
#6 Nobody (nobody) 1576 (42945) 2010-10-19 22:44:55
#7 Simon Jakob (simon.jakob) 1523 (18714) 2010-10-22 02:01:36
#8 Juan (kation) 1385 (6113) 2010-11-02 18:10:15
#9 Sven Ge (Sven-from-de) 1353 (2852) 2010-11-08 23:45:57
#10 mischa (mmisc) 1225 (22426) 2011-01-31 02:36:02
#11 David (aki321) 1216 (27482) 2011-02-14 16:42:56
#12 Armin Krauss (argh) 1206 (206965) 2011-03-08 22:23:48
#13 Wolfgang Weisser (wowmyst) 1201 (33108) 2011-03-21 15:16:08
#14 Ishaan (Ishaan) 1200 (1200) 2011-03-23 02:32:59
#15 Sepp Maier (smai) 1191 (1898) 2011-04-20 10:23:39
#16 Tom Tailor (-=Aloras=-) 1188 (1390) 2011-04-28 19:37:45
#17 Roland Jansen (roland) 1187 (17607) 2011-05-04 18:08:00
#18 J. M. (jomandi) 1179 (113270) 2011-06-05 23:39:35
#19 Peter Mustermann (Gummiboot) 1169 (60285) 2011-07-24 21:20:14
#20 Daniel Fretwell (fretty) 1166 (30107) 2011-08-13 13:08:25
#21 Viktor (Veselovský) 1166 (169444) 2011-08-13 21:18:22
#22 Seth Kintigh (DarkFibre) 1166 (79471) 2011-08-14 06:56:30
#23 Joerg Schneider (jcs) 1166 (1166) 2011-08-15 10:37:44
#24 Nicolas Golubovic (qll) 1165 (14919) 2011-08-17 16:19:08
#25 Flip (Flip) 1165 (31107) 2011-08-18 18:22:10
#26 h3po (h3po) 1165 (20433) 2011-08-21 19:50:53
#27 dbuq (dbuq) 1165 (22762) 2011-08-21 22:22:07
#28 The Killer (Killer) 1159 (42393) 2011-10-02 03:08:22
#29 Dano (Dano) 1159 (14610) 2011-10-03 00:18:20
#30 Thomas Gonda (TomG) 1158 (36291) 2011-10-04 21:49:45
#31 Thomas Lambert (lambert) 1158 (38594) 2011-10-09 13:00:42
#32 Bart den Hartog (Bart13) 1153 (148936) 2011-11-18 02:34:51
#33 Keith Randall (randall77) 1152 (31011) 2011-12-04 07:29:42
#34 Nathan (Witten) 1151 (25326) 2011-12-08 01:36:54
#35 jacobian1729 (jacobian1729) 1147 (5584) 2012-01-22 17:42:34
#36 Michel Van Caneghem (vancan) 1145 (49719) 2012-02-12 16:31:49
#37 Martin Härterich (HaeM) 1145 (15149) 2012-02-16 10:30:03
#38 Luigi Tomelli (archstanton) 1144 (127538) 2012-02-25 10:49:00
#39 Hans Peter (hanspeter) 1141 (52356) 2012-04-03 09:45:52
#40 Kurt Gebauer (Yokozuna) 1141 (282608) 2012-04-03 17:31:35
#41 Aliazer (Aliazer) 1140 (12521) 2012-04-20 21:21:05
#42 Daniel Demmler (dd23) 1139 (8942) 2012-04-29 21:50:23
#43 Dusan (xxdradus) 1137 (40436) 2012-05-23 08:47:23
#44 Alastair Aitchison (tanoshimi) 1136 (1236) 2012-06-12 19:56:33
#45 Daniel Richter (TheHiveMind) 1136 (11450) 2012-06-14 10:18:00
#46 Ralf Stephan (rwst) 1135 (25229) 2012-06-24 17:14:29
#47 Christian (Etschupu) 1134 (31788) 2012-07-13 10:42:43
#48 fergus (fergus) 1131 (1944) 2012-09-04 14:41:44
#49 RPH (derichard) 1130 (27044) 2012-09-16 14:29:16
#50 Hank (hanky) 1130 (24373) 2012-09-29 22:07:19
#51 Mangesh (mangesh) 1129 (1129) 2012-10-14 00:44:26
#52 Santosh (santoshy2k007) 1129 (1129) 2012-10-14 02:15:13
#53 E.T (Ertheb) 1128 (81809) 2012-10-29 18:45:19
#54 The Enigma (enigma) 1128 (14336) 2012-11-12 18:50:52
#55 Claude Laveaux (claude.laveaux) 1125 (14504) 2012-12-30 17:32:06
#56 Em Doulgerakis (Greko) 1125 (193799) 2013-01-11 11:47:58
#57 zahir mohsen moradi (ariobarzan) 1124 (99757) 2013-02-02 21:49:14
#58 Ben (Koerber) 1124 (2642) 2013-02-11 04:05:01
#59 mk (bilbobeutlin) 1121 (12340) 2013-04-08 21:26:09
#60 Velko Nikolov (staafl) 1121 (13467) 2013-04-18 14:07:30
#61 Almut (problelmo) 1120 (45992) 2013-05-07 06:10:50
#62 Gergely Simon (george314) 1119 (17850) 2013-06-28 11:02:43
#63 Philipp Hammer-Pohlau (phase2) 1118 (17981) 2013-07-23 17:19:01
#64 George (Theofanidis) 1117 (130187) 2013-08-07 19:30:30
#65 cyclops (cyclops) 1117 (2549) 2013-08-22 18:14:22
#66 Forrest Gump (Polyphem) 1117 (38763) 2013-08-28 00:33:00
#67 Steve (Samacian) 1116 (23915) 2013-09-09 07:41:52
#68 Alexander (cruachan) 1116 (16051) 2013-09-29 20:17:22
#69 Boris (Kaasu) 1115 (16566) 2013-10-22 09:12:59
#70 Francisco Moraes (fmoraes) 1114 (90044) 2013-11-11 21:46:32
#71 Brad (braddrew) 1114 (15878) 2013-12-09 09:53:17
#72 jonathan (munz) 1113 (8954) 2013-12-31 22:39:25
#73 Alain (Integral) 1113 (207924) 2014-01-06 15:45:55
#74 Pavel (haw) 1113 (22728) 2014-01-16 16:18:02
#75 Michael Doucha (mdou) 1112 (13757) 2014-02-17 20:04:45
#76 Marcel (bene1512) 1112 (20896) 2014-02-19 19:50:12
#77 Kim H. S. (tenchijin) 1112 (25468) 2014-02-21 14:13:26
#78 hellman (hellman) 1111 (14862) 2014-03-12 16:25:21
#79 masam (jimboo) 1111 (18687) 2014-03-30 20:10:00
#80 caesar ([caesar]) 1111 (10738) 2014-04-03 15:28:37
#81 Ben (Paulsen) 1111 (2421) 2014-04-06 02:09:25
#82 Karl Schutt (günter) 1111 (44374) 2014-04-06 22:46:19
#83 Snake (snk) 1109 (187783) 2014-06-18 18:24:10
#84 Peter (51dc30ddc) 1108 (10916) 2014-07-26 23:32:42
#85 julius gaius (julius) 1108 (25581) 2014-07-27 21:13:06
#86 Robert (rm) 1108 (56475) 2014-07-31 23:14:46
#87 Christof B. (beans90) 1108 (9488) 2014-08-12 16:53:23
#88 baz (oneiron) 1108 (12353) 2014-08-13 08:11:33
#89 Charles Bocage (diesal9) 1107 (1107) 2014-09-23 12:28:25
#90 Javantea (Javantea) 1106 (40816) 2014-11-19 02:45:59
#91 Julia Bernotat (El Greco ) 1105 (81129) 2014-11-30 22:51:28
#92 Claude Vaillancourt (Cl3v3r) 1105 (44129) 2015-01-10 19:56:16
#93 Kai Ludwig (TalentRaspel) 1105 (15704) 2015-01-15 19:58:56
#94 Shoukat (e195633) 1104 (10617) 2015-02-08 18:59:13
#95 Danny Higgins (hamster147) 1104 (39638) 2015-02-17 14:11:31
#96 Konstantin Golovan (SoulShaker) 1104 (14091) 2015-03-08 13:25:24
#97 Jeremy Chuang (jeremhh) 1103 (6643) 2015-03-19 14:32:44
#98 R (r?) 1103 (6742) 2015-03-20 22:18:18
#99 Rainer Zufall (kiekuk) 1103 (56786) 2015-04-06 00:12:29
#100 D (devilchn) 1102 (11142) 2015-06-17 15:37:41
#101 Erik (Erox) 1101 (26141) 2015-07-15 23:13:28
#102 J-L Morel (Rossignol) 1101 (42130) 2015-07-29 16:59:53
#103 chris_3stones (3stones) 1101 (38845) 2015-08-06 15:23:52
#104 Sean (Kavanaugh) 1101 (29143) 2015-08-14 22:27:11
#105 Hans Joachim Girulat (joregi) 1100 (36278) 2015-10-23 22:42:46
#106 Scombes (jerva) 1100 (266541) 2015-10-25 09:47:05
#107 Alain Collignon (vexilla72) 1100 (123666) 2015-10-30 16:40:37
#108 Szabó Zoltán (szabo.z87) 1100 (55604) 2015-11-10 10:59:10
#109 Martin (martinbucher) 1100 (38365) 2015-11-14 13:12:06
#110 Dominik M. (Sgt. Pepper) 1099 (128575) 2015-12-22 13:28:15
#111 Casaubon (cfreuden) 1099 (8515) 2016-01-18 14:26:31
#112 Wolfgang (grauerwolf) 1098 (1098) 2016-01-29 07:49:16
#113 John (Block52) 1098 (1098) 2016-02-22 07:11:33
#114 Marco Manfredi (mkk9901) 1098 (17686) 2016-03-14 17:19:30
#115 Peter (Garnet) 1097 (14234) 2016-04-22 16:52:14
#116 Andreas Frerichs (Ossili) 1097 (33266) 2016-04-27 19:15:03
#117 Norbert Biermann (Norbert) 1096 (47790) 2016-07-31 11:23:33
#118 CESH (cesh) 1096 (4995) 2016-08-19 22:52:12
#119 Flo (sealth) 1096 (25734) 2016-08-24 00:50:33
#120 Yeshwanth Bashyam (yeshbash) 1095 (1095) 2016-09-22 00:24:02
#121 Rajat Kabra (rajat kabra) 1095 (1195) 2016-09-22 01:07:19
#122 Nicolas (nicosPavlov) 1095 (257791) 2016-10-01 07:14:22
#123 ender (endered) 1095 (5478) 2016-11-20 06:56:03
#124 neko (neko) 1095 (7679) 2016-11-20 08:53:32
#125 JoGo (JoGo) 1095 (11686) 2016-12-05 13:00:01
#126 zuben c3 (zuben-c3) 1094 (42163) 2017-01-08 13:32:04
#127 Michael (FoM) 1094 (57794) 2017-01-26 08:39:13
#128 Tristan1473 (Tristan1473) 1094 (20432) 2017-02-04 11:43:44
#129 Georgius Stolte (HazmatsFear) 1094 (16071) 2017-02-11 17:02:55
#130 Mir Dim (mir0soft) 1093 (79760) 2017-03-14 13:53:15
#131 chris (c2) 1093 (51973) 2017-03-16 14:52:03
#132 Vaidotas (Hurrislt) 1093 (3579) 2017-03-20 20:29:16
#133 Kasia (kasia-tutej) 1093 (53366) 2017-05-30 13:46:28
#134 Mihail (plexor) 1092 (16827) 2017-06-12 14:38:01
#135 D3d4lu5 (D3d4lu5) 1092 (363488) 2017-06-13 19:45:04
#136 Imam Uasa (Merricx) 1092 (9188) 2017-06-17 23:56:02
#137 Akonia (Akonia12) 1092 (12153) 2017-07-19 20:35:29
#138 George Lasry (george4096) 1092 (399565) 2017-08-12 18:57:14
#139 Immo Weber (MandelToast) 1092 (10362) 2017-08-21 23:24:09
#140 Julian (Lemmynator) 1092 (20822) 2017-09-16 18:13:37
#141 Aijun (geaijun) 1090 (3479) 2018-01-07 11:49:33
#142 Tom Tox (tox) 1090 (17708) 2018-03-13 15:39:05
#143 Nofre Tete (noffi) 1090 (26507) 2018-03-15 00:44:28
#144 Godfrey Norton (Godfrey) 1090 (8162) 2018-03-16 08:15:08
#145 v3ct0r (V3ct0r_) 1090 (1291) 2018-04-05 18:47:38
#146 Eric (ExAstris) 1089 (56037) 2018-05-17 21:56:22
#147 Steve Vaillancourt (stvai2) 1089 (15041) 2018-06-01 03:07:39
#148 Random Dude (rnd) 1089 (103645) 2018-08-07 03:17:12
#149 Manfred Paul (manf) 1088 (14774) 2018-11-14 16:54:36
#150 kilink (kilink) 1087 (8053) 2019-01-22 11:48:26
#151 simone (xseris) 1087 (8632) 2019-02-16 11:28:34
#152 LoneWolf219 (LoneWolf219) 1087 (12795) 2019-03-08 05:49:22
#153 E41614031 (E41614031) 1087 (7526) 2019-03-09 11:59:41
#154 schwuggel1337 (schwuggel1337) 1087 (7716) 2019-03-20 19:24:21
#155 Will (nitrow) 1087 (6807) 2019-03-21 16:01:54
#156 Klaus (kumaus) 1087 (22017) 2019-04-01 14:11:52
#157 Lane Williams (planetlane) 1087 (34637) 2019-04-16 03:07:48
#158 Marco Cinelli (Snap) 1086 (37769) 2019-05-06 14:09:54
#159 Mike (RogueRamblers) 1086 (81614) 2019-05-27 16:43:01
#160 ENOENT (ENOENT) 1086 (13478) 2019-05-31 15:35:57
#161 Eugene (lim0n) 1086 (193160) 2019-06-21 14:02:32
#162 yult (yult) 1086 (12185) 2019-07-12 19:58:05
#163 Gerd Wilts (gerdw) 1086 (50634) 2019-07-13 09:27:00
#164 ajg (ludimus) 1086 (12114) 2019-07-23 10:23:48
#165 Dr. Peter Uelkes (RandyWaterhouse) 1086 (9990) 2019-08-03 07:30:38
#166 Stephan (Stephje1978) 1086 (27064) 2019-08-23 18:51:17
#167 Terence (tec) 1085 (8237) 2019-12-12 07:18:41
#168 Magata (fmagata) 1085 (11780) 2020-01-04 23:44:59
#169 LurkNoi (Lurkrul) 1084 (19595) 2020-02-18 15:37:09
#170 Artur Puzio (cytadela8) 1084 (14801) 2020-02-24 14:23:17
#171 Bernd (Elian) 1084 (3069) 2020-04-11 22:22:53
#172 DS (DS8279) 1083 (29732) 2020-07-01 16:55:23
#173 anomy (anomy) 1083 (3249) 2020-07-30 08:42:02
#174 mglarragan (mglarragan) 1083 (5067) 2020-08-10 12:02:12
#175 Polaris (Polaris) 1083 (32963) 2020-08-13 13:37:40
#176 Vinay (vinay27) 1083 (1083) 2020-09-11 14:39:21
#177 Costantino (Majakovskij) 1083 (9774) 2020-10-04 18:02:19
#178 Enigmatic (Enigmatic) 1083 (11604) 2020-10-29 18:58:16
#179 Nicky (Wokini) 1083 (18494) 2020-11-23 12:02:36
#180 Jean-Francois (Muskrat) 1082 (19013) 2021-01-09 21:07:26
#181 Alexander W. Janssen (itnomad) 1082 (10782) 2021-01-15 16:54:51
#182 amir (V5November) 1082 (13344) 2021-01-24 17:10:21
#183 m (umsyt) 1082 (9300) 2021-03-12 03:03:07
#184 madness (madness) 1082 (71592) 2021-04-17 20:59:23
#185 Antares (Antares) 1081 (32880) 2021-07-09 15:06:48
#186 thatbusybeaver (thatbusybeaver) 1081 (12456) 2021-07-29 05:50:49
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Not-so-Secret Message from Malawi — Part II (ECC)

[schaefer-02] - 37 users already solved this challenge, 2 are working on it.
 
 
 

It is also important to choose the parameters of an elliptic curve cryptosystem wisely. This was not done in this example, which should enable you to decrypt another ciphertext message from Malawi. The plaintext reveals the codeword, although this time it is not as closely related to the photo.
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: 50

All successful users of this challenge

Rank User (#37) Achieved points (Global score) y-m-d - h:m:s

Cezary Glowacz (cezaryglowacz) 1576 (9995) 2010-10-19 17:20:21
Ulrich Armbrüster (uarmbruester) 1414 (7987) 2010-10-29 20:08:00
Flip (Flip) 1222 (31107) 2011-02-04 00:26:45
Armin Krauss (argh) 1216 (206965) 2011-02-14 16:01:41
#5 Wolfgang Weisser (wowmyst) 1209 (33108) 2011-03-02 01:51:28
#6 J. M. (jomandi) 1179 (113270) 2011-06-07 00:19:02
#7 Viktor (Veselovský) 1169 (169444) 2011-07-27 17:16:22
#8 Daniel Fretwell (fretty) 1169 (30107) 2011-07-28 13:00:03
#9 The Killer (Killer) 1152 (42393) 2011-11-28 01:29:31
#10 Keith Randall (randall77) 1151 (31011) 2011-12-05 19:03:10
#11 Luigi Tomelli (archstanton) 1143 (127538) 2012-03-04 20:45:58
#12 Aliazer (Aliazer) 1140 (12521) 2012-04-19 22:15:47
#13 Michel Van Caneghem (vancan) 1138 (49719) 2012-05-18 09:29:50
#14 Bart den Hartog (Bart13) 1134 (148936) 2012-07-17 13:35:26
#15 Christian (Etschupu) 1134 (31788) 2012-07-19 15:13:25
#16 Thomas Lambert (lambert) 1132 (38594) 2012-08-22 18:48:04
#17 RPH (derichard) 1121 (27044) 2013-04-17 00:00:47
#18 Em Doulgerakis (Greko) 1118 (193799) 2013-07-17 14:15:08
#19 Kurt Gebauer (Yokozuna) 1117 (282608) 2013-08-17 22:40:10
#20 zahir mohsen moradi (ariobarzan) 1116 (99757) 2013-09-13 23:04:52
#21 Alain (Integral) 1113 (207924) 2014-01-09 17:32:40
#22 Forrest Gump (Polyphem) 1112 (38763) 2014-02-18 22:55:00
#23 Francisco Moraes (fmoraes) 1106 (90044) 2014-11-20 19:52:23
#24 Ben Ward (bward) 1101 (2519) 2015-08-01 22:54:14
#25 Martin (martinbucher) 1098 (38365) 2016-03-22 12:29:12
#26 Dominik M. (Sgt. Pepper) 1095 (128575) 2016-10-05 22:14:50
#27 T (Wagner) 1093 (16988) 2017-05-10 07:57:03
#28 Kasia (kasia-tutej) 1092 (53366) 2017-06-15 23:59:04
#29 Mir Dim (mir0soft) 1092 (79760) 2017-07-30 07:42:44
#30 Nicolas (nicosPavlov) 1090 (257791) 2018-02-04 08:07:45
#31 kilink (kilink) 1087 (8053) 2019-01-22 15:43:59
#32 D3d4lu5 (D3d4lu5) 1087 (363488) 2019-02-26 18:04:45
#33 schwuggel1337 (schwuggel1337) 1087 (7716) 2019-03-21 13:55:08
#34 Eugene (lim0n) 1085 (193160) 2019-10-27 11:04:21
#35 Marco Cinelli (Snap) 1082 (37769) 2021-02-19 19:24:29
#36 Nicky (Wokini) 1082 (18494) 2021-02-25 09:22:00
#37 madness (madness) 1082 (71592) 2021-04-10 18:06:39
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Notes of an Italian Soldier

[schroedel-03] - 4 users already solved this challenge.
 
 
 

During World War II, the Italian solider Antonio Marzi worked as a radio operator. He created more than 230 pages full of enciphered notes about his experiences. Unfortunately, he forgot one step of his enciphering method. Still today, his records have never been decrypted.
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: 0

All successful users of this challenge

Rank User (#4) Achieved points (Global score) y-m-d - h:m:s

Armin Krauss (argh) 3000 (206965) 2013-02-18 19:59:00
Viktor (Veselovský) 800 (169444) 2013-05-04 22:57:00
J. M. (jomandi) 800 (113270) 2013-05-19 13:45:00
George Lasry (george4096) 800 (399565) 2013-12-12 15:07:29
The solution for this challenge was made public on 2014-01-25, and thus it is not possible to get points for this challenge any more. However, you can still solve and enter a solution for this challenge. If you believe you have the solution, you can still write us an email.
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Double Column Transposition

[schmeh-03] - 2 users already solved this challenge.
 
 
 

The double columnar transposition is considered one of the best manual encryption systems. Many secret organizations have made use of it or still use it today. As there are only a few publications on this method, it is not clear if and how a well-constructed double transposition cipher can be broken.
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Published on: 2010-10-14 13:30
Maximum number of attempts for this challenge: 0

All successful users of this challenge

Rank User (#2) Achieved points (Global score) y-m-d - h:m:s

George Lasry (george4096) 11000 (399565) 2013-11-26 17:23:24
Jim Gillogly (Scryer) 10000 (21260) 2013-12-31 13:58:23
The solution for this challenge was made public on 2014-06-13, and thus it is not possible to get points for this challenge any more. However, you can still solve and enter a solution for this challenge. If you believe you have the solution, you can still write us an email.
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