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 (296)

Ordered by date posted, the most recent appear first.

Double Column Transposition Reloaded — Part 3

[wacker-10] - 0 users already solved this challenge.
 
 
 

The double columnar transposition is considered to be one of the best manual encryption systems. This sequence considers vulnerabilities that have been used to solve the corresponding level X challenge. The three challenges of the sequence have an increasing difficulty. In the third part a German plaintext has been encrypted with random keys.
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Authors: This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-12-11 20:11
Maximum number of attempts for this challenge: 15

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Double Column Transposition Reloaded — Part 2

[wacker-09] - 0 users already solved this challenge, 1 is working on it.
 
 
 

The double columnar transposition is considered to be one of the best manual encryption systems. This sequence considers vulnerabilities that have been used to solve the corresponding level X challenge. The three challenges of the sequence have an increasing difficulty. In the second part two interleaved English texts have been encrypted with random keys.
Read more...

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Authors: This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-12-11 20:11
Maximum number of attempts for this challenge: 15

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No one solved the challenge right now. Be the first!
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Double Column Transposition Reloaded — Part 1

[wacker-08] - 0 users already solved this challenge, 2 are working on it.
 
 
 

The double columnar transposition is considered to be one of the best manual encryption systems. This sequence considers vulnerabilities that have been used to solve the corresponding level X challenge. The three challenges of the sequence have an increasing difficulty. In the first part an English plaintext has been encrypted with keys derived from English sentences.
Read more...

Click here to get to the corresponding forum topic to share your opinion.
Click here to download the challenge.
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Authors: This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-12-11 20:09
Maximum number of attempts for this challenge: 15

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Enigma Messages with Repeated Letters — Part 2

[lasry-02] - 68 users already solved this challenge, 17 are working on it.
 
 
 

In this part of this series of Enigma challenges, a plaintext message consisting of one letter which is repeated several times has been encrypted by the Enigma I. What was the setting of the Enigma rotors?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-10-28 20:53
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#68) Achieved points (Global score) y-m-d - h:m:s

Armin Krauss (argh) 200 (188214) 2013-10-28 23:12:20
Viktor (Veselovský) 200 (155163) 2013-10-29 01:39:38
Em Doulgerakis (Greko) 200 (131437) 2013-10-29 11:32:52
Kurt Gebauer (Yokozuna) 200 (177433) 2013-10-29 16:44:09
#5 Alexander (cruachan) 150 (16051) 2013-10-30 17:04:21
#6 Michael Möller (michaelm) 133 (175129) 2013-10-31 16:18:50
#7 Forrest Gump (Polyphem) 125 (38763) 2013-11-01 17:00:49
#8 J. M. (jomandi) 120 (113270) 2013-11-02 01:33:05
#9 Seth Kintigh (DarkFibre) 120 (79471) 2013-11-02 04:20:21
#10 Timo (Amarth) 120 (831) 2013-11-02 11:43:14
#11 E.T (Ertheb) 114 (81809) 2013-11-04 18:07:14
#12 Luigi Tomelli (archstanton) 111 (108345) 2013-11-06 14:01:55
#13 H. Lautenschlager (helmi) 111 (32947) 2013-11-06 20:11:39
#14 George (Theofanidis) 108 (113380) 2013-11-09 23:09:03
#15 Bart den Hartog (Bart13) 107 (144081) 2013-11-11 22:48:14
#16 Francisco Moraes (fmoraes) 106 (90044) 2013-11-13 23:30:01
#17 Jim Gillogly (Scryer) 103 (21260) 2013-12-05 21:32:06
#18 Dusan (xxdradus) 102 (40236) 2013-12-09 17:29:23
#19 TURINGBOMBE (TBREAKER) 102 (10616) 2013-12-22 14:35:59
#20 Alain (Integral) 101 (207924) 2014-01-14 08:22:19
#21 Thomas Lambert (lambert) 101 (35237) 2014-03-09 12:26:46
#22 David (aki321) 101 (27482) 2014-03-10 01:46:01
#23 Sebastian Slupina (Grandwizard) 101 (10866) 2014-03-12 14:06:11
#24 RPH (derichard) 101 (27044) 2014-03-24 19:02:16
#25 Karl Schutt (günter) 101 (41550) 2014-05-02 16:49:50
#26 Snake (snk) 100 (86245) 2014-06-06 16:17:55
#27 Michel Van Caneghem (vancan) 100 (49719) 2014-06-14 16:30:04
#28 Bernhard Gruber (bgr) 100 (22889) 2014-07-28 23:12:30
#29 Pavel Kessler (pavel) 100 (5096) 2014-07-30 22:41:57
#30 Robert (rm) 100 (56475) 2014-07-31 22:53:21
#31 Markus (Wasser) 100 (702) 2014-08-11 13:08:16
#32 julius gaius (julius) 100 (25581) 2014-08-14 08:44:09
#33 Julia Bernotat (El Greco ) 100 (81129) 2014-11-12 01:23:53
#34 S Combes (jerva) 100 (99132) 2015-01-25 20:34:39
#35 Rainer Zufall (kiekuk) 100 (56786) 2015-02-19 23:20:21
#36 Hans Joachim Girulat (joregi) 100 (36278) 2015-04-02 22:45:53
#37 Vlatiha Romanova (Vlatiha) 100 (10323) 2015-04-16 12:18:34
#38 Steve (Samacian) 100 (23804) 2015-05-19 02:12:10
#39 Andreas Frerichs (Ossili) 100 (33266) 2015-05-27 23:09:43
#40 zahir mohsen moradi (ariobarzan) 100 (99757) 2015-06-04 19:22:45
#41 Michael Ammon (Ammonym) 100 (7719) 2015-06-08 18:58:46
#42 KW (qwer*) 100 (13963) 2015-06-16 18:06:45
#43 Peter (TomBombadil) 100 (3417) 2015-09-06 18:40:58
#44 Claude Vaillancourt (Cl3v3r) 100 (38351) 2015-09-13 14:26:22
#45 J-L Morel (Rossignol) 100 (29425) 2015-10-22 10:43:32
#46 Szabó Zoltán (szabo.z87) 100 (55604) 2016-01-11 15:49:32
#47 Alain Collignon (vexilla72) 100 (96903) 2016-01-15 17:59:11
#48 Nofre Tete (noffi) 100 (21921) 2016-02-03 16:53:15
#49 Marc (rcll0891) 100 (24004) 2016-03-16 19:25:05
#50 Erik (Erox) 100 (26141) 2016-04-17 17:58:32
#51 Norbert Biermann (Norbert) 100 (45031) 2016-08-22 14:14:08
#52 Nicolas (nicosPavlov) 100 (151166) 2016-10-16 14:58:47
#53 zuben c3 (zuben-c3) 100 (24853) 2016-12-03 16:05:19
#54 Javantea (Javantea) 100 (40816) 2016-12-15 23:06:58
#55 Marcel (bene1512) 100 (20896) 2016-12-30 20:10:06
#56 Rene (ion) 100 (5617) 2017-02-02 20:44:28
#57 Dominik M. (Sgt. Pepper) 100 (97919) 2017-03-22 19:39:06
#58 chris (c2) 100 (51973) 2017-03-24 10:51:08
#59 Daniel Walder (ibex) 100 (14672) 2017-05-03 00:49:57
#60 Mir Dim (mir0soft) 100 (72404) 2017-05-07 12:10:44
#61 D3d4lu5 (D3d4lu5) 100 (297709) 2017-06-21 12:34:10
#62 Lane Williams (planetlane) 100 (23948) 2017-06-21 20:58:14
#63 Random Dude (rnd) 100 (97213) 2018-08-23 00:43:27
#64 sarah b (silva) 100 (26264) 2018-11-26 19:56:42
#65 Michael (FoM) 100 (38953) 2018-12-31 11:34:35
#66 Mike (RogueRamblers) 100 (32275) 2019-05-10 20:18:30
#67 Eugene (lim0n) 100 (67666) 2019-09-17 09:44:11
#68 Alain Terieur (Alain) 100 (6410) 2019-11-09 01:07:55
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Trifid Cipher

[gysler-02] - 108 users already solved this challenge, 7 are working on it.
 
 
 

Two scatterbrained professors exchange messages that have been encrypted with the Trifid cipher. Unfortunately, one of them lost the second of three layers. Will he nevertheless be able to decrypt the message he received from his colleague?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-10-28 20:49
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#108) Achieved points (Global score) y-m-d - h:m:s

Armin Krauss (argh) 200 (188214) 2013-10-29 00:11:55
Kurt Gebauer (Yokozuna) 200 (177433) 2013-10-29 01:01:21
Viktor (Veselovský) 200 (155163) 2013-10-29 01:09:57
Snake (snk) 200 (86245) 2013-10-29 11:28:48
#5 H. Lautenschlager (helmi) 200 (32947) 2013-10-29 12:02:52
#6 Hans Peter (hanspeter) 200 (52256) 2013-10-29 13:43:41
#7 zahir mohsen moradi (ariobarzan) 200 (99757) 2013-10-29 14:26:29
#8 Michael Möller (michaelm) 200 (175129) 2013-10-29 17:20:19
#9 E.T (Ertheb) 200 (81809) 2013-10-29 17:44:41
#10 J. M. (jomandi) 150 (113270) 2013-10-30 10:00:11
#11 Hannes Nötzli (Faust) 150 (4781) 2013-10-30 16:54:48
#12 Alexander (cruachan) 150 (16051) 2013-10-30 18:04:02
#13 Bart den Hartog (Bart13) 150 (144081) 2013-10-30 19:22:24
#14 Forrest Gump (Polyphem) 133 (38763) 2013-10-31 00:45:09
#15 Steve (Samacian) 133 (23804) 2013-10-31 12:47:01
#16 Bernhard Gruber (bgr) 125 (22889) 2013-10-31 21:24:25
#17 KW (qwer*) 125 (13963) 2013-11-01 20:21:19
#18 George (Theofanidis) 120 (113380) 2013-11-01 23:38:52
#19 Sebastian Slupina (Grandwizard) 120 (10866) 2013-11-02 15:41:22
#20 Luigi Tomelli (archstanton) 111 (108345) 2013-11-06 10:19:08
#21 Holti (Holti) 108 (6035) 2013-11-09 18:06:25
#22 Shimi (elyimmy) 107 (207) 2013-11-11 19:41:34
#23 j.h. (haegarq) 106 (15252) 2013-11-14 13:54:06
#24 Joost (Joost) 103 (2653) 2013-11-26 00:24:15
#25 Dusan (xxdradus) 103 (40236) 2013-11-26 14:56:21
#26 A. S. (er1709) 103 (1608) 2013-12-02 22:19:53
#27 Em Doulgerakis (Greko) 101 (131437) 2014-01-06 15:49:01
#28 Alain (Integral) 101 (207924) 2014-01-12 17:28:03
#29 Steffen (Mandelbaum) 101 (101) 2014-01-15 17:49:49
#30 Kim H. S. (tenchijin) 101 (25468) 2014-01-22 13:23:09
#31 Nascha (Nascha) 101 (101) 2014-02-08 13:25:03
#32 Moritz Stocker (Trismegistos) 101 (2471) 2014-02-10 13:08:15
#33 Sascha (The Hoddich) 101 (4350) 2014-03-03 10:08:31
#34 Silvija H. (Hafner) 101 (401) 2014-03-15 22:45:59
#35 Laura (Weltenwandlerin) 101 (1004) 2014-03-18 17:10:04
#36 Felix (codeflx) 101 (1915) 2014-03-22 16:26:54
#37 masam (jimboo) 101 (18687) 2014-03-24 19:29:16
#38 Bertold (bk) 101 (9673) 2014-04-03 21:09:12
#39 Karl Schutt (günter) 101 (41550) 2014-04-04 21:03:11
#40 edventscher (edventscher) 101 (101) 2014-04-10 10:17:36
#41 Siggi Kraus (Kruxi) 101 (701) 2014-04-26 13:50:58
#42 Luca (jellyluke) 101 (2140) 2014-04-30 19:40:37
#43 Michael S (Scherbius) 101 (403) 2014-05-04 22:41:46
#44 Aivaras (TaiAivaras) 100 (500) 2014-05-20 17:37:42
#45 Michel Van Caneghem (vancan) 100 (49719) 2014-05-24 08:46:20
#46 Tina (BTina) 100 (1500) 2014-05-30 05:48:37
#47 Francisco Moraes (fmoraes) 100 (90044) 2014-06-28 16:56:00
#48 Jay Kay (Merty) 100 (3726) 2014-07-06 16:00:18
#49 Robert (rm) 100 (56475) 2014-07-31 23:06:07
#50 Julia Bernotat (El Greco ) 100 (81129) 2014-07-31 23:33:04
#51 Michael (miklzbr) 100 (100) 2014-08-19 22:16:20
#52 Andreas Frerichs (Ossili) 100 (33266) 2014-09-02 21:12:59
#53 Darío Lafuente (darolaf) 100 (100) 2014-09-23 21:34:15
#54 Lane Williams (planetlane) 100 (23948) 2014-11-24 20:40:18
#55 Heather Williams (planetheather) 100 (1927) 2014-11-24 21:08:07
#56 Julia Werdelmann (jw) 100 (10407) 2014-12-05 00:09:47
#57 Pavel (haw) 100 (22728) 2014-12-06 21:33:06
#58 ab (ababab) 100 (200) 2014-12-14 20:34:50
#59 Max Mustermann (MustermM) 100 (6661) 2014-12-16 16:54:47
#60 HolgerK (HolgerK) 100 (25776) 2014-12-22 23:55:19
#61 S Combes (jerva) 100 (99132) 2015-01-21 20:23:25
#62 Vlatiha Romanova (Vlatiha) 100 (10323) 2015-02-10 13:51:06
#63 Claude Vaillancourt (Cl3v3r) 100 (38351) 2015-02-12 18:12:03
#64 Elena (Lifeindeath) 100 (2798) 2015-02-19 23:37:59
#65 micaman (micaman) 100 (4634) 2015-02-21 00:03:31
#66 Muendo (muendo) 100 (3501) 2015-02-24 09:47:11
#67 Tim Fink (Magellan) 100 (4876) 2015-03-11 03:20:32
#68 Patrick Renz (tarantulla) 100 (2027) 2015-03-31 13:37:56
#69 Rainer Zufall (kiekuk) 100 (56786) 2015-04-07 15:06:19
#70 Thomas Gonda (TomG) 100 (36291) 2015-04-14 21:29:41
#71 Hans Joachim Girulat (joregi) 100 (36278) 2015-04-21 09:26:49
#72 Michael Ammon (Ammonym) 100 (7719) 2015-06-20 22:48:44
#73 Mikaela Bergstedt (Millie82) 100 (200) 2015-07-07 11:56:47
#74 Alain Collignon (vexilla72) 100 (96903) 2015-10-07 11:50:30
#75 S (Zyphe) 100 (10461) 2015-10-24 20:23:34
#76 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-01 05:22:58
#77 Dominik M. (Sgt. Pepper) 100 (97919) 2015-12-16 10:04:10
#78 Ines (bufo01) 100 (4515) 2016-02-22 23:18:13
#79 Peter (Garnet) 100 (14234) 2016-03-13 23:26:06
#80 Stephan (stegi) 100 (801) 2016-07-09 20:51:47
#81 J-L Morel (Rossignol) 100 (29425) 2016-07-10 17:33:57
#82 Norbert Biermann (Norbert) 100 (45031) 2016-07-31 22:47:59
#83 Nicolas (nicosPavlov) 100 (151166) 2016-10-07 12:37:59
#84 Hajoe (Tintin-Muc) 100 (6923) 2016-10-24 23:01:50
#85 Yass (Yass) 100 (300) 2016-11-04 21:15:39
#86 Michael (FoM) 100 (38953) 2016-11-29 23:48:37
#87 Marcel (bene1512) 100 (20896) 2016-12-29 18:07:38
#88 Nofre Tete (noffi) 100 (21921) 2016-12-29 18:09:10
#89 Anggia (Vuleedazula) 100 (1608) 2017-03-07 12:39:46
#90 Mir Dim (mir0soft) 100 (72404) 2017-03-21 07:20:36
#91 chris (c2) 100 (51973) 2017-03-28 19:50:48
#92 Daniel Walder (ibex) 100 (14672) 2017-05-11 23:33:18
#93 D3d4lu5 (D3d4lu5) 100 (297709) 2017-06-18 03:41:37
#94 Jimmy Gauvin (amateur) 100 (200) 2017-09-13 23:26:25
#95 Michael Jeffrey (empjay) 100 (3004) 2017-12-26 20:02:43
#96 Richard Bean (detrevni) 100 (100) 2018-03-24 05:34:35
#97 Benjamin (200611736) 100 (10186) 2018-04-13 23:40:59
#98 Samuel (Samusicus) 100 (2203) 2018-04-23 21:52:01
#99 Eric (ExAstris) 100 (27090) 2018-05-29 17:55:23
#100 Random Dude (rnd) 100 (97213) 2018-07-06 02:09:53
#101 sarah b (silva) 100 (26264) 2018-07-31 14:15:08
#102 Julian (Lemmynator) 100 (18353) 2018-07-31 16:51:53
#103 Stephan (Stephje1978) 100 (26961) 2019-06-09 13:09:05
#104 Jeff (Fountain) 100 (8788) 2019-06-17 15:30:14
#105 Mike (RogueRamblers) 100 (32275) 2019-06-28 17:32:21
#106 Dr. Peter Uelkes (RandyWaterhouse) 100 (9990) 2019-08-02 08:05:30
#107 Eugene (lim0n) 100 (67666) 2019-09-15 15:51:20
#108 Danny Higgins (hamster147) 100 (38289) 2019-10-06 10:30:57
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   +++    [09:00 - 14.11.2019] SirAbacus solved the Level I challenge 'Number Sequence — Part 3'    +++    [06:47 - 14.11.2019] Miles solved the Level I challenge '¿No Hablas Español? No problemo!'    +++    [05:26 - 14.11.2019] Akuro solved the Level II challenge 'Letter to the Templars — Part 3'    +++    [05:10 - 14.11.2019] Akuro solved the Level I challenge 'Letter to the Templars — Part 2'    +++    [04:54 - 14.11.2019] Akuro solved the Level I challenge 'Letter to the Templars — Part 1'    +++