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 (294)

Ordered by date posted, the most recent appear first.

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.
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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 (188214) 2013-02-18 19:59:00
Viktor (Veselovský) 800 (155163) 2013-05-04 22:57:00
J. M. (jomandi) 800 (113270) 2013-05-19 13:45:00
George Lasry (george4096) 800 (302230) 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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Not-so-Secret Message from Malawi — Part II (ECC)

[schaefer-02] - 33 users already solved this challenge, 3 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.
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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: 50

All successful users of this challenge

Rank User (#33) 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 (188214) 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 (155163) 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 (108345) 2012-03-04 20:45:58
#12 Aliazer (Aliazer) 1140 (12314) 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 (144081) 2012-07-17 13:35:26
#15 Christian (Etschupu) 1134 (31788) 2012-07-19 15:13:25
#16 Thomas Lambert (lambert) 1132 (35237) 2012-08-22 18:48:04
#17 RPH (derichard) 1121 (27044) 2013-04-17 00:00:47
#18 Em Doulgerakis (Greko) 1118 (125331) 2013-07-17 14:15:08
#19 Kurt Gebauer (Yokozuna) 1117 (177433) 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 (27363) 2016-03-22 12:29:12
#26 Dominik M. (Sgt. Pepper) 1095 (97919) 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 (72404) 2017-07-30 07:42:44
#30 Nicolas (nicosPavlov) 1090 (151166) 2018-02-04 08:07:45
#31 kilink (kilink) 1087 (8053) 2019-01-22 15:43:59
#32 D3d4lu5 (D3d4lu5) 1087 (297709) 2019-02-26 18:04:45
#33 schwuggel1337 (schwuggel1337) 1087 (7716) 2019-03-21 13:55:08
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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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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 (#2) Achieved points (Global score) y-m-d - h:m:s

George Lasry (george4096) 11000 (302230) 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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D'Agapeyeff

[schmeh-02] - 0 users already solved this challenge.
 
 
 

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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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

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Classical Ciphers^3

[wacker-01] - 156 users already solved this challenge, 16 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.
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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: 15

All successful users of this challenge

Rank User (#156) 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 (1991) 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 (25229) 2010-10-18 16:54:42
#9 Michael Fischer (MichaelF) 120 (853) 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 (188214) 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 (3746) 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 Martin Bauser (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 (155163) 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 (2562) 2011-10-25 19:55:07
#43 Bart den Hartog (Bart13) 100 (144081) 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 (177433) 2012-03-19 01:46:12
#53 H. Lautenschlager (helmi) 100 (32947) 2012-04-24 20:17:09
#54 Dusan (xxdradus) 100 (40236) 2012-04-26 11:29:48
#55 George (Theofanidis) 100 (112184) 2012-05-22 11:42:51
#56 Thomas Lambert (lambert) 100 (35237) 2012-08-02 17:54:23
#57 E.T (Ertheb) 100 (81809) 2012-08-04 14:26:28
#58 Em Doulgerakis (Greko) 100 (125331) 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 (36278) 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 (1601) 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 (302230) 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 (175129) 2014-02-05 16:38:08
#94 Snake (snk) 100 (86245) 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 (26141) 2015-08-02 18:41:29
#117 Sirius (Leznar) 100 (4552) 2015-09-22 18:08:22
#118 Alain Collignon (vexilla72) 100 (96903) 2015-10-12 09:07:56
#119 Joerg G. (SnifferMaster) 100 (18154) 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 (45031) 2016-07-28 08:55:49
#128 Chris Kolonko (ckolonko) 100 (900) 2016-08-21 22:28:21
#129 Dominik M. (Sgt. Pepper) 100 (97919) 2016-10-13 21:21:37
#130 Michael (FoM) 100 (38953) 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 (14672) 2017-04-16 23:10:18
#136 Danny Higgins (hamster147) 100 (38289) 2017-04-24 09:02:21
#137 sarah b (silva) 100 (26264) 2017-06-09 16:14:21
#138 D3d4lu5 (D3d4lu5) 100 (297709) 2017-06-13 13:21:27
#139 nimroth (nimroth cynthor) 100 (6021) 2017-11-23 19:50:35
#140 Julian (Lemmynator) 100 (18353) 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 (23948) 2018-06-14 19:58:59
#144 Random Dude (rnd) 100 (95975) 2018-07-30 01:51:41
#145 Bertolo (Bertolo) 100 (7167) 2019-01-01 11:17:49
#146 madness (madness) 100 (15407) 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 (kumaus) 100 (21415) 2019-03-13 16:36:12
#150 Sebastian Slupina (Grandwizard) 100 (10866) 2019-04-03 19:25:52
#151 Eugene (lim0n) 100 (64198) 2019-05-02 12:56:45
#152 Hughes (hughes) 100 (7925) 2019-05-03 15:49:44
#153 Jeff (Fountain) 100 (8788) 2019-06-02 00:43:45
#154 Mike (RogueRamblers) 100 (29805) 2019-06-06 18:56:56
#155 Stephan (Stephje1978) 100 (26961) 2019-06-24 02:06:36
#156 Malte Spiegelberg (Caunthol) 100 (601) 2019-07-16 17:55:38
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   +++    [22:10 - 20.10.2019] Greko solved the Level II challenge 'Homophonic Encryption — Part 3'    +++    [21:30 - 20.10.2019] Sgt4chan solved the Level I challenge 'Factorization Cipher — Part 1'    +++    [20:34 - 20.10.2019] rnd solved the Level II challenge 'The T52 Sturgeon Challenge — Part 2'    +++    [13:11 - 20.10.2019] lim0n solved the Level II challenge 'Music Code — Part 2'    +++    [13:09 - 20.10.2019] lim0n solved the Level I challenge 'Music Code — Part 1'    +++