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 (267)

Ordered by date posted, the most recent appear first.

Cascading Encryption — Part 3/3

[wacker-07] - 10 users already solved this challenge.
 
 
 

Use the hints from the first and second part of this challenge to decrypt this message that has been encrypted using an ENIGMA.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-03-29 12:52
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#10) Achieved points (Global score) y-m-d - h:m:s

Luigi Tomelli (archstanton) 1485 (106685) 2013-04-08 11:32:41
J. M. (jomandi) 1353 (113270) 2013-04-23 21:11:38
George Lasry (george4096) 1190 (287902) 2013-10-07 04:33:16
Em Doulgerakis (Greko) 1186 (124033) 2013-10-19 17:49:39
#5 Kurt Gebauer (Yokozuna) 1183 (142278) 2013-11-01 09:31:48
#6 Bart den Hartog (Bart13) 1150 (118984) 2014-06-02 02:03:23
#7 Viktor (Veselovský) 1148 (134627) 2014-06-22 22:08:13
#8 Alain (Integral) 1136 (207924) 2014-11-20 15:44:40
#9 Armin Krauss (argh) 1125 (171390) 2015-06-17 12:20:34
#10 Szabó Zoltán (szabo.z87) 1116 (55604) 2016-03-01 15:51:31
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Cascading Encryption — Part 2/3

[wacker-06] - 10 users already solved this challenge, 2 are working on it.
 
 
 

After solving the first part of this challenge, you can use the hints you found to decrypt the two ciphertexts that have been encrypted using the ADFGVX cipher.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-03-25 15:05
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#10) Achieved points (Global score) y-m-d - h:m:s

Luigi Tomelli (archstanton) 1547 (106685) 2013-03-31 20:34:10
J. M. (jomandi) 1349 (113270) 2013-04-21 15:29:10
Armin Krauss (argh) 1214 (171390) 2013-07-31 19:03:54
Em Doulgerakis (Greko) 1195 (124033) 2013-09-14 23:30:24
#5 George Lasry (george4096) 1193 (287902) 2013-09-21 01:27:01
#6 Kurt Gebauer (Yokozuna) 1185 (142278) 2013-10-18 22:38:50
#7 Bart den Hartog (Bart13) 1150 (118984) 2014-06-01 11:10:18
#8 Viktor (Veselovský) 1149 (134627) 2014-06-09 01:03:28
#9 Alain (Integral) 1137 (207924) 2014-11-11 11:43:01
#10 Szabó Zoltán (szabo.z87) 1116 (55604) 2016-03-01 09:39:21
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Reserve Hand Procedure — Part 1

[hoerenberg-03] - 164 users already solved this challenge, 10 are working on it.
 
 
 

The reserve hand procedure has been used as a replacement of the Enigma machine. Can you decrypt the given ciphertext?
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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: 2013-03-06 21:14
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#164) Achieved points (Global score) y-m-d - h:m:s

H. Lautenschlager (helmi) 200 (29022) 2013-03-06 22:27:40
Viktor (Veselovský) 200 (134627) 2013-03-06 22:41:39
J. M. (jomandi) 200 (113270) 2013-03-06 22:50:44
Kurt Gebauer (Yokozuna) 200 (142278) 2013-03-06 23:14:08
#5 Bart den Hartog (Bart13) 200 (118984) 2013-03-07 00:59:32
#6 Luigi Tomelli (archstanton) 200 (106685) 2013-03-07 09:46:47
#7 George (Theofanidis) 200 (101521) 2013-03-07 12:02:50
#8 Snake (snk) 200 (67306) 2013-03-07 13:12:26
#9 Hans Peter (hanspeter) 200 (52256) 2013-03-07 13:40:53
#10 David (aki321) 200 (27482) 2013-03-07 17:17:31
#11 Em Doulgerakis (Greko) 200 (124033) 2013-03-07 18:31:53
#12 KW (qwer*) 200 (13963) 2013-03-07 18:58:43
#13 Armin Krauss (argh) 200 (171390) 2013-03-07 19:05:07
#14 Tobias (toubieh) 150 (150) 2013-03-08 14:58:08
#15 E.T (Ertheb) 150 (70149) 2013-03-08 17:46:41
#16 vanderguile (vanderguile) 113 (2916) 2013-03-14 01:29:12
#17 masam (jimboo) 110 (18687) 2013-03-16 02:25:51
#18 RPH (derichard) 110 (27044) 2013-03-16 12:52:56
#19 Julia Werdelmann (jw) 110 (10407) 2013-03-16 13:50:07
#20 Thomas Lambert (lambert) 109 (38594) 2013-03-17 12:29:38
#21 Kirill (ineaugh) 109 (1920) 2013-03-17 21:08:08
#22 Ole K (Baalspawn) 108 (108) 2013-03-18 10:00:40
#23 vas (pet) 108 (8197) 2013-03-18 14:03:43
#24 Seth Kintigh (DarkFibre) 108 (79471) 2013-03-19 02:53:29
#25 j.h. (haegarq) 108 (15252) 2013-03-19 20:57:16
#26 Petra (humppapenguin) 106 (3872) 2013-03-24 13:40:23
#27 Klaus (hoevi) 105 (2302) 2013-03-28 02:17:00
#28 Dusan (xxdradus) 104 (40236) 2013-03-29 13:26:11
#29 Glaudson Ocampos (nashleon) 104 (1820) 2013-03-30 08:29:38
#30 John (Breen) 104 (104) 2013-03-30 08:53:44
#31 Yann (Stricnis) 104 (104) 2013-04-03 14:01:08
#32 coldwaterq (coldwaterq) 103 (1705) 2013-04-09 20:55:24
#33 Tom Tox (tox) 103 (17708) 2013-04-10 15:05:41
#34 Tuta Muniz (tutamuniz) 103 (103) 2013-04-11 05:29:57
#35 Hannes Nötzli (Faust) 103 (4781) 2013-04-11 18:53:45
#36 madroland (madroland) 103 (503) 2013-04-12 06:31:45
#37 Ramon Rojas (superme) 103 (3409) 2013-04-13 20:52:03
#38 Step (l0rdp3rth) 102 (836) 2013-04-22 16:43:33
#39 Meine Registrierung (TryC3) 102 (6045) 2013-04-22 17:00:56
#40 Sascha Schärich (Lawiak) 102 (1673) 2013-04-22 17:33:31
#41 C.G. (XORro) 102 (235) 2013-04-22 23:20:47
#42 Stephanie Hösel (Phiesel) 102 (502) 2013-04-24 13:40:07
#43 Nemo (nemo) 102 (235) 2013-04-25 12:22:40
#44 Christian (chrikru) 102 (520) 2013-04-26 09:19:19
#45 Jay Kay (Merty) 102 (3726) 2013-04-26 11:29:55
#46 Kyle Reed (kallanreed) 102 (216) 2013-04-26 23:29:56
#47 Martin Steinborn (Maldin) 102 (512) 2013-04-29 20:23:31
#48 Silvia (Sina) 102 (512) 2013-04-29 20:59:03
#49 Martin (Metin) 102 (212) 2013-04-30 13:19:22
#50 Clemens Schulz (caschulz) 101 (501) 2013-05-15 21:23:38
#51 Sebastian Slupina (Grandwizard) 101 (10264) 2013-05-20 13:13:59
#52 Bentz (Wolfgang19) 101 (2583) 2013-05-20 22:49:14
#53 Christian Inci (ch100) 101 (9253) 2013-05-27 18:41:47
#54 Anggia (Vuleedazula) 101 (1608) 2013-05-30 16:44:35
#55 Markus S. (Brisios) 101 (402) 2013-05-30 20:30:15
#56 Gerhard (Ghossi) 101 (203) 2013-06-02 01:02:00
#57 chris_3stones (3stones) 101 (37759) 2013-06-10 18:56:47
#58 Mikhail (Miko) 101 (604) 2013-06-11 06:42:04
#59 Stephan Krätzschmar (cyvr1) 101 (403) 2013-06-11 10:14:06
#60 Georgius Stolte (HazmatsFear) 101 (15671) 2013-06-11 23:24:52
#61 Vlatiha Romanova (Vlatiha) 101 (10323) 2013-06-14 15:34:01
#62 Steve (Samacian) 101 (23804) 2013-06-27 04:35:32
#63 Friedemann (friede) 101 (3599) 2013-06-27 22:22:06
#64 Bernhard Gruber (bgr) 101 (22889) 2013-06-28 14:55:49
#65 Bernd (BRK) 101 (2275) 2013-07-01 20:02:38
#66 Thomas Pohl (thexmojo) 101 (734) 2013-07-05 15:37:41
#67 zahir mohsen moradi (ariobarzan) 101 (99757) 2013-07-06 16:43:37
#68 Sascha (DoctorHell) 101 (1305) 2013-07-09 15:06:58
#69 ABo (LordPresident) 101 (409) 2013-07-13 14:16:58
#70 Hans Joachim Girulat (joregi) 101 (33493) 2013-07-16 10:44:03
#71 David (En0pH1) 101 (702) 2013-07-22 00:36:42
#72 Michel Van Caneghem (vancan) 101 (49719) 2013-07-25 12:04:54
#73 Philipp Hammer-Pohlau (phase2) 101 (17981) 2013-07-25 21:23:08
#74 Ralf Stephan (rwst) 101 (22735) 2013-07-27 09:30:58
#75 Michael S (Scherbius) 101 (403) 2013-07-29 21:38:59
#76 Lutz Sittinger (Kryptolutz) 101 (1802) 2013-08-10 16:27:04
#77 Almut (problelmo) 101 (45992) 2013-08-19 22:23:42
#78 Forrest Gump (Polyphem) 101 (38763) 2013-08-25 15:11:27
#79 Felix (Flix) 101 (13712) 2013-08-28 15:59:55
#80 Thomas Gonda (TomG) 101 (36291) 2013-09-02 16:27:10
#81 Alexander (cruachan) 101 (16051) 2013-09-06 17:01:00
#82 Andreas Wolff (timberwolff) 101 (1340) 2013-09-06 21:09:08
#83 Hank (hanky) 100 (22859) 2013-09-23 19:46:52
#84 Gergely Simon (george314) 100 (16555) 2013-10-03 22:28:32
#85 Paul (pgilbert) 100 (657) 2013-10-18 05:32:45
#86 Boris (Kaasu) 100 (16566) 2013-10-19 19:44:15
#87 Timo (Amarth) 100 (831) 2013-10-22 23:07:14
#88 Norbert Paefgen (egebamyasi) 100 (2728) 2013-12-01 13:13:04
#89 Michael Möller (michaelm) 100 (167404) 2013-12-05 16:58:18
#90 Alain (Integral) 100 (207924) 2013-12-15 14:34:54
#91 George Robinson (osric) 100 (1413) 2013-12-18 15:48:32
#92 bla (bla) 100 (2750) 2013-12-21 23:18:27
#93 Csaba Fitzl (csaby) 100 (6696) 2014-01-02 10:31:55
#94 Kim H. S. (tenchijin) 100 (25468) 2014-01-02 15:13:35
#95 Pavel (haw) 100 (22728) 2014-01-28 18:55:38
#96 Marcel (bene1512) 100 (20896) 2014-01-30 12:29:22
#97 Bertold (bk) 100 (9673) 2014-02-09 18:29:21
#98 Nofre Tete (noffi) 100 (21921) 2014-02-11 20:11:22
#99 Sascha (The Hoddich) 100 (4350) 2014-03-03 11:43:40
#100 mark (FivePrime) 100 (3345) 2014-03-13 17:31:40
#101 Stuart (stuartg) 100 (3558) 2014-03-24 10:38:02
#102 Axel Reyno (axelreyno) 100 (2243) 2014-03-26 07:29:37
#103 yusef (yusef) 100 (3558) 2014-04-01 13:13:02
#104 Karl Schutt (günter) 100 (39890) 2014-04-06 11:24:50
#105 Raphaël (Yahoo51) 100 (901) 2014-05-12 20:51:07
#106 Joe (IlmJoe) 100 (2938) 2014-06-18 14:29:11
#107 Jian Wen (XxWappenxX) 100 (4048) 2014-06-24 19:42:06
#108 Julia Bernotat (El Greco ) 100 (81129) 2014-07-01 19:17:14
#109 julius gaius (julius) 100 (25581) 2014-07-21 11:12:01
#110 Hughes (hughes) 100 (4735) 2014-07-22 16:32:28
#111 Robert (rm) 100 (56475) 2014-07-31 22:21:06
#112 testgrr (testgrr) 100 (3940) 2014-10-25 14:01:31
#113 Alexand Matrosov (havesomeyankee) 100 (2028) 2014-10-26 19:55:11
#114 Francisco Moraes (fmoraes) 100 (90044) 2014-10-30 19:24:28
#115 Lane Williams (planetlane) 100 (15331) 2014-11-11 01:13:56
#116 Tim Fink (Magellan) 100 (4876) 2014-11-13 07:23:57
#117 HolgerK (HolgerK) 100 (25776) 2014-11-23 14:57:18
#118 Kai Ludwig (TalentRaspel) 100 (15704) 2015-01-06 20:37:54
#119 Danny Higgins (hamster147) 100 (21817) 2015-01-07 13:55:38
#120 Andreas Frerichs (Ossili) 100 (33266) 2015-02-03 15:23:14
#121 Mike H (Hunter234) 100 (800) 2015-03-02 11:20:48
#122 Konstantin Golovan (SoulShaker) 100 (14091) 2015-03-06 21:20:32
#123 Philippe ALLARD (Flobert) 100 (4035) 2015-03-12 15:13:05
#124 Rainer Zufall (kiekuk) 100 (53834) 2015-03-25 22:13:39
#125 Brian Kieslich (briank) 100 (6733) 2015-04-09 21:33:51
#126 Michael Ammon (Ammonym) 100 (7719) 2015-06-02 22:39:25
#127 Ethan (EESearch) 100 (3925) 2015-06-04 01:24:27
#128 Mark van Heeswijk (markvh) 100 (2600) 2015-07-07 02:57:14
#129 Erik (Erox) 100 (22651) 2015-07-16 17:55:13
#130 Isabella (Isa) 100 (4235) 2015-08-18 16:28:21
#131 Alain Collignon (vexilla72) 100 (75089) 2015-09-30 08:00:45
#132 J-L Morel (Rossignol) 100 (29125) 2015-10-04 15:54:46
#133 Joerg G. (SnifferMaster) 100 (17853) 2015-10-22 17:06:56
#134 S (Zyphe) 100 (9371) 2015-10-24 15:25:55
#135 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-11 17:51:23
#136 Rainer (Rainer74) 100 (8417) 2015-12-17 18:51:00
#137 Joerg Schaeffler (DrAcula) 100 (2948) 2016-02-08 00:38:52
#138 Peter (Garnet) 100 (14234) 2016-03-09 15:08:35
#139 Marc (rcll0891) 100 (20690) 2016-03-14 21:04:47
#140 Dominik M. (Sgt. Pepper) 100 (84103) 2016-03-19 18:28:22
#141 Martin (martinbucher) 100 (27363) 2016-04-30 12:27:19
#142 Norbert Biermann (Norbert) 100 (44430) 2016-07-08 15:54:11
#143 Nicolas (nicosPavlov) 100 (151166) 2016-09-29 13:39:39
#144 Hajoe (Tintin-Muc) 100 (6923) 2016-10-27 22:29:50
#145 Wall (Hadrian) 100 (4098) 2016-11-21 14:59:14
#146 zuben c3 (zuben-c3) 100 (23853) 2016-11-26 22:20:04
#147 JoGo (JoGo) 100 (11686) 2016-12-06 23:25:05
#148 Julian (Lemmynator) 100 (16666) 2016-12-10 00:10:52
#149 Michael (FoM) 100 (17771) 2016-12-17 01:52:55
#150 Rene (ion) 100 (5617) 2017-02-17 19:34:35
#151 Mir Dim (mir0soft) 100 (72404) 2017-03-13 15:29:32
#152 chris (c2) 100 (51973) 2017-03-17 15:39:17
#153 Daniel Walder (ibex) 100 (14372) 2017-04-25 22:58:59
#154 D3d4lu5 (D3d4lu5) 100 (183554) 2017-06-13 03:17:20
#155 Michael Jeffrey (empjay) 100 (3004) 2017-06-19 22:36:11
#156 nimroth (nimroth cynthor) 100 (6021) 2017-12-26 23:07:40
#157 Ines (bufo01) 100 (4515) 2018-01-15 22:12:20
#158 Benjamin (200611736) 100 (7776) 2018-04-11 01:57:25
#159 Steve Vaillancourt (stvai2) 100 (15041) 2018-05-16 00:08:41
#160 Eric (ExAstris) 100 (26990) 2018-05-25 00:45:09
#161 Christophe BORELLY (cb34) 100 (12358) 2018-06-07 18:36:21
#162 Random Dude (rnd) 100 (67574) 2018-07-11 01:34:58
#163 sarah b (silva) 100 (10365) 2018-08-21 16:51:17
#164 Pavel Kessler (pavel) 100 (3791) 2018-12-09 18:58:15
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Typex — Part 1

[chang-01] - 20 users already solved this challenge, 1 is working on it.
 
 
 

The Typex cipher has been used in World War 2 as an alternative to the Enigma cipher. Find the key that was used in this challenge.
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Click here to download the additional file of the challenge.

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: 2013-02-28 14:02
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#20) Achieved points (Global score) y-m-d - h:m:s

Armin Krauss (argh) 2000 (171390) 2013-02-28 23:48:44
Kurt Gebauer (Yokozuna) 1725 (142278) 2013-03-03 01:19:38
J. M. (jomandi) 1613 (113270) 2013-03-04 15:08:24
Luigi Tomelli (archstanton) 1456 (106685) 2013-03-12 09:42:54
#5 Viktor (Veselovský) 1378 (134627) 2013-03-20 18:57:41
#6 George (Theofanidis) 1256 (101521) 2013-05-10 06:12:18
#7 DirkS (Dustman) 1253 (8479) 2013-05-13 07:57:32
#8 zahir mohsen moradi (ariobarzan) 1202 (99757) 2013-08-02 14:55:14
#9 Forrest Gump (Polyphem) 1184 (38763) 2013-09-28 22:28:07
#10 Bart den Hartog (Bart13) 1184 (118984) 2013-10-01 01:01:03
#11 E.T (Ertheb) 1170 (70149) 2013-12-03 18:37:24
#12 Alain (Integral) 1164 (207924) 2014-01-11 18:12:03
#13 Francisco Moraes (fmoraes) 1163 (90044) 2014-01-18 01:22:10
#14 George Lasry (george4096) 1151 (287902) 2014-04-26 09:59:24
#15 Claude Vaillancourt (Cl3v3r) 1120 (38351) 2015-09-22 12:54:04
#16 S Combes (jerva) 1120 (99132) 2015-10-09 23:37:30
#17 Karl Schutt (günter) 1118 (39890) 2015-12-05 13:59:52
#18 Nicolas (nicosPavlov) 1108 (151166) 2016-11-19 19:17:24
#19 WayneTW (skycckk) 1106 (1106) 2017-03-21 18:30:20
#20 D3d4lu5 (D3d4lu5) 1103 (183554) 2017-08-24 18:35:49
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Multilingual Monoalphabetic Substitution

[theofanidis-04] - 59 users already solved this challenge, 6 are working on it.
 
 
 

The plaintext consists of English, French, German and Italian words. Can you identify the four sentences after you have solved the monoalphabetic substitution?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-01-30 14:27
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#59) Achieved points (Global score) y-m-d - h:m:s

E.T (Ertheb) 200 (70149) 2013-01-30 17:43:50
Armin Krauss (argh) 200 (171390) 2013-01-30 21:36:36
Viktor (Veselovský) 200 (134627) 2013-01-31 01:07:14
Snake (snk) 150 (67306) 2013-01-31 16:01:55
#5 kevin shaw (steggily) 150 (2298) 2013-02-01 13:37:29
#6 Iain Sharp (WoodenHedgehog) 150 (2196) 2013-02-01 13:40:17
#7 David (aki321) 150 (27482) 2013-02-01 13:50:33
#8 H. Lautenschlager (helmi) 125 (29022) 2013-02-02 20:48:07
#9 Kurt Gebauer (Yokozuna) 125 (142278) 2013-02-02 20:57:34
#10 J. M. (jomandi) 106 (113270) 2013-02-16 00:48:24
#11 Lucas Dreyer (luc4sdreyer) 104 (104) 2013-02-26 21:14:58
#12 Luigi Tomelli (archstanton) 103 (106685) 2013-02-28 10:46:15
#13 Kirill (ineaugh) 102 (1920) 2013-03-18 01:36:51
#14 Seth Kintigh (DarkFibre) 102 (79471) 2013-03-19 03:27:59
#15 Dusan (xxdradus) 102 (40236) 2013-03-25 19:37:31
#16 swarmspider (swarmspider) 101 (4528) 2013-04-22 15:17:40
#17 Jörg Schwarzwälder (secuso) 101 (2125) 2013-05-05 22:33:12
#18 Michael Möller (michaelm) 101 (167404) 2013-05-22 21:34:56
#19 Michel Van Caneghem (vancan) 101 (49719) 2013-07-30 09:35:09
#20 Em Doulgerakis (Greko) 100 (124033) 2013-09-10 10:07:51
#21 Bart den Hartog (Bart13) 100 (118984) 2013-09-14 16:06:53
#22 George Lasry (george4096) 100 (287902) 2013-12-03 03:30:40
#23 Alain (Integral) 100 (207924) 2013-12-15 19:39:56
#24 Marcel (bene1512) 100 (20896) 2014-02-07 17:45:06
#25 Sascha (The Hoddich) 100 (4350) 2014-03-03 14:09:56
#26 Karl Schutt (günter) 100 (39890) 2014-05-03 21:19:45
#27 Bernhard Gruber (bgr) 100 (22889) 2014-06-30 20:16:20
#28 Robert (rm) 100 (56475) 2014-07-31 23:00:23
#29 Julia Bernotat (El Greco ) 100 (81129) 2014-08-27 00:46:26
#30 Lane Williams (planetlane) 100 (15331) 2014-10-26 00:06:56
#31 Francisco Moraes (fmoraes) 100 (90044) 2014-10-31 15:18:52
#32 Tim Fink (Magellan) 100 (4876) 2014-12-31 11:22:38
#33 HolgerK (HolgerK) 100 (25776) 2015-01-15 22:28:40
#34 Georgius Stolte (HazmatsFear) 100 (15671) 2015-02-22 13:44:25
#35 Andreas Frerichs (Ossili) 100 (33266) 2015-03-20 17:55:16
#36 chris_3stones (3stones) 100 (37759) 2015-04-05 11:49:50
#37 partamier (yann) 100 (5435) 2015-05-16 11:57:17
#38 Hans Joachim Girulat (joregi) 100 (33493) 2015-06-02 17:04:10
#39 Michael Ammon (Ammonym) 100 (7719) 2015-06-21 00:41:42
#40 Rainer Zufall (kiekuk) 100 (53834) 2015-09-30 22:00:55
#41 Alain Collignon (vexilla72) 100 (75089) 2015-10-02 16:06:10
#42 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-21 15:17:49
#43 zahir mohsen moradi (ariobarzan) 100 (99757) 2016-05-30 21:23:31
#44 Peter (Garnet) 100 (14234) 2016-05-31 11:40:12
#45 J-L Morel (Rossignol) 100 (29125) 2016-07-23 19:27:21
#46 Norbert Biermann (Norbert) 100 (44430) 2016-09-15 15:36:45
#47 zuben c3 (zuben-c3) 100 (23853) 2016-11-21 18:15:11
#48 Nicolas (nicosPavlov) 100 (151166) 2017-01-24 17:27:54
#49 Dominik M. (Sgt. Pepper) 100 (84103) 2017-03-30 20:00:26
#50 sarah b (silva) 100 (10365) 2017-05-05 21:20:33
#51 Daniel Walder (ibex) 100 (14372) 2017-05-16 00:52:13
#52 Marc (rcll0891) 100 (20690) 2017-08-19 14:20:10
#53 Kim H. S. (tenchijin) 100 (25468) 2017-08-25 23:08:45
#54 D3d4lu5 (D3d4lu5) 100 (183554) 2017-08-26 07:11:26
#55 Ines (bufo01) 100 (4515) 2018-01-15 17:55:26
#56 Steve Vaillancourt (stvai2) 100 (15041) 2018-04-29 23:59:33
#57 Eric (ExAstris) 100 (26990) 2018-05-20 21:46:39
#58 Random Dude (rnd) 100 (67574) 2018-07-07 05:21:23
#59 Bertolo (Bertolo) 100 (7167) 2018-12-31 14:09:48
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   +++    [12:16 - 16.01.2019] mhoefl solved the Level I challenge 'Number Sequence — Part 4'    +++    [06:17 - 16.01.2019] haegarq solved the Level I challenge 'Cryptanalysis Hacking Puzzles — Part 2'    +++    [23:46 - 15.01.2019] bcarey92 solved the Level I challenge 'Original Caesar Cipher'    +++    [23:24 - 15.01.2019] FindNix11 solved the Level I challenge 'Number Sequence'    +++    [22:57 - 15.01.2019] silva solved the Level I challenge 'Cryptanalysis Hacking Puzzles — Part 2'    +++