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 (282)

Ordered by date posted, the most recent appear first.

Alice's Birthday Party (Part 2)

[kitrub-02] - 237 users already solved this challenge, 3 are working on it.
 
 
 

Alice has learned from her mistake from last year. This year, she makes sure that the friends to whom she sends invitations for her birthday party all use unique RSA N parameters. However, this time she still makes another mistake that allows an adversary, Eve, to reconstruct the message.

Can you again decrypt this year's invitation? The codeword for this challenge is the location of Alice's party.
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: 20

All successful users of this challenge

Rank User (#237) Achieved points (Global score) y-m-d - h:m:s

Nobody (nobody) 2000 (40618) 2010-10-14 13:31:45
kyprizel (kyprizel) 1725 (20795) 2010-10-16 20:00:25
Nabb (Nabb) 1725 (13670) 2010-10-16 23:25:58
Cezary Glowacz (cezaryglowacz) 1725 (9995) 2010-10-16 23:53:15
#5 Martin Wittiger (wittiger) 1725 (3450) 2010-10-17 01:48:28
#6 Simon Jakob (simon.jakob) 1613 (18714) 2010-10-18 19:43:09
#7 Ralf Stephan (rwst) 1613 (25229) 2010-10-19 09:52:51
#8 Thomas Schmucker (dg) 1576 (26066) 2010-10-19 18:27:11
#9 Ulrich Dürholz (Uli) 1576 (1576) 2010-10-20 01:09:49
#10 Michał Bartoszkiewicz (embe) 1576 (3269) 2010-10-20 02:24:25
#11 Dennis Nolte (JokerX) 1502 (6177) 2010-10-22 17:01:26
#12 Roadrunner (rr) 1502 (12702) 2010-10-22 22:33:10
#13 Claude Laveaux (claude.laveaux) 1469 (14504) 2010-10-24 14:26:31
#14 Armin Krauss (argh) 1433 (185115) 2010-10-27 22:59:10
#15 Christian (Etschupu) 1406 (31788) 2010-10-30 17:02:30
#16 mischa (mmisc) 1406 (22426) 2010-10-30 18:25:49
#17 Juan (kation) 1398 (6113) 2010-11-01 01:27:03
#18 piler (piler) 1385 (2818) 2010-11-03 02:47:11
#19 David (aki321) 1378 (27482) 2010-11-03 14:48:25
#20 Stefan Kühne (subROUTINE) 1353 (3595) 2010-11-09 10:58:39
#21 Ilya Ozerov (ilya) 1327 (20556) 2010-11-15 22:29:28
#22 Ulrich Armbrüster (uarmbruester) 1321 (7987) 2010-11-17 17:48:48
#23 chris (iceace) 1268 (2536) 2010-12-14 22:40:35
#24 Sabrina W. (sabrina) 1266 (2532) 2010-12-15 23:42:07
#25 S. N. (Tig3r) 1252 (2504) 2010-12-27 21:55:31
#26 Thomas Gonda (TomG) 1244 (36291) 2011-01-05 18:16:42
#27 Markus H. (maxxh) 1237 (3728) 2011-01-13 19:09:13
#28 Erik Rusek (Rusk) 1234 (3717) 2011-01-17 20:02:34
#29 Wolfgang Weisser (wowmyst) 1229 (33108) 2011-01-25 03:04:37
#30 Fabian Bendun (benfa) 1210 (8697) 2011-02-27 22:22:19
#31 Alan Dixon (NickBourbaki) 1209 (7761) 2011-03-02 22:14:07
#32 RashmiSheetal (rashmisheetal) 1205 (2411) 2011-03-10 20:16:23
#33 Gayathri (gaayaathrees) 1205 (1205) 2011-03-11 04:37:47
#34 Sandhya (sandy_crypto) 1205 (1205) 2011-03-11 04:48:13
#35 J. M. (jomandi) 1180 (113270) 2011-06-02 18:56:34
#36 Daniel Fretwell (fretty) 1176 (30107) 2011-06-20 15:29:19
#37 Seth Kintigh (DarkFibre) 1170 (79471) 2011-07-21 07:27:13
#38 Peter Mustermann (Gummiboot) 1169 (60285) 2011-07-23 15:03:41
#39 Viktor (Veselovský) 1168 (151602) 2011-07-31 00:03:42
#40 Dano (Dano) 1167 (14610) 2011-08-09 10:51:39
#41 Nicolas Golubovic (qll) 1165 (14919) 2011-08-20 21:15:06
#42 dbuq (dbuq) 1165 (22762) 2011-08-21 12:45:42
#43 The Killer (Killer) 1165 (42393) 2011-08-22 00:17:46
#44 h3po (h3po) 1164 (20433) 2011-08-22 20:19:21
#45 Cleyton Muto (accepted_rush) 1164 (5578) 2011-08-25 00:16:13
#46 Flip (Flip) 1164 (31107) 2011-08-28 18:52:33
#47 Robbt Neid (Das Tupel) 1163 (9403) 2011-09-02 20:34:54
#48 Roland Jansen (roland) 1160 (17607) 2011-09-20 14:51:14
#49 Anton Wendel (MoD) 1159 (5679) 2011-09-30 12:53:31
#50 Thomas Lambert (lambert) 1158 (35237) 2011-10-08 12:02:03
#51 Bart den Hartog (Bart13) 1153 (132400) 2011-11-16 02:55:44
#52 Keith Randall (randall77) 1151 (31011) 2011-12-07 00:16:13
#53 Nathan (Witten) 1151 (25326) 2011-12-11 20:36:33
#54 Flo Geht_dich gar_nichts_an (flo) 1150 (6271) 2011-12-14 16:12:36
#55 Jan Temme (JaT3) 1150 (11694) 2011-12-22 17:33:19
#56 John (johnstosh) 1146 (4448) 2012-02-03 02:40:22
#57 Michel Van Caneghem (vancan) 1145 (49719) 2012-02-12 11:52:32
#58 Martin Härterich (HaeM) 1145 (15149) 2012-02-13 17:18:44
#59 Hans Peter (hanspeter) 1144 (52256) 2012-02-19 01:21:30
#60 Luigi Tomelli (archstanton) 1144 (108345) 2012-02-20 10:55:10
#61 Lukas (Kahla) 1143 (4719) 2012-02-29 15:14:20
#62 mallika (perepamallika) 1142 (2284) 2012-03-16 23:34:17
#63 snigdha (snigdha) 1142 (2284) 2012-03-23 06:59:43
#64 Kurt Gebauer (Yokozuna) 1141 (159388) 2012-03-27 01:52:17
#65 Steluta P. (maty_star) 1140 (5734) 2012-04-14 02:15:16
#66 Aliazer (Aliazer) 1139 (12314) 2012-04-26 22:20:07
#67 Daniel Demmler (dd23) 1139 (8942) 2012-04-29 14:50:24
#68 Moi (MSTinaFlow) 1139 (2979) 2012-05-03 19:24:24
#69 captp (bdcht) 1138 (5864) 2012-05-10 22:46:54
#70 Dusan (xxdradus) 1138 (40236) 2012-05-19 07:00:59
#71 George (Theofanidis) 1137 (109124) 2012-05-31 00:24:07
#72 chris_3stones (3stones) 1136 (37759) 2012-06-10 12:41:05
#73 zuben c3 (zuben-c3) 1135 (24853) 2012-06-27 13:37:01
#74 Em Doulgerakis (Greko) 1134 (124033) 2012-07-12 10:53:05
#75 Stepan (m1sterx) 1131 (19165) 2012-09-06 08:45:44
#76 RPH (derichard) 1130 (27044) 2012-09-16 12:40:14
#77 vas (pet) 1130 (8197) 2012-09-23 21:01:29
#78 Hank (hanky) 1130 (22859) 2012-09-25 21:55:59
#79 Hannes (Hartmann) 1130 (8680) 2012-09-25 22:47:33
#80 scout (Scout) 1129 (2368) 2012-10-12 04:55:08
#81 E.T (Ertheb) 1128 (81809) 2012-10-25 20:53:33
#82 Lakshmi Ananthagopal (lakshmi87) 1128 (2256) 2012-11-04 06:27:34
#83 The Enigma (enigma) 1128 (14336) 2012-11-09 20:53:42
#84 Eugene (ZhekaS) 1128 (6037) 2012-11-11 02:00:41
#85 Friedrich Wiemer (asante) 1127 (5183) 2012-11-16 16:50:37
#86 Tron (Tron) 1126 (7381) 2012-12-22 16:48:01
#87 Julia Werdelmann (jw) 1126 (10407) 2012-12-23 00:09:33
#88 zahir mohsen moradi (ariobarzan) 1124 (99757) 2013-02-03 22:47:19
#89 mk (bilbobeutlin) 1122 (12340) 2013-03-19 20:31:23
#90 Velko Nikolov (staafl) 1121 (13467) 2013-04-11 23:21:51
#91 Almut (problelmo) 1121 (45992) 2013-04-27 08:03:33
#92 Philipp Hammer-Pohlau (phase2) 1118 (17981) 2013-07-22 11:22:49
#93 masam (jimboo) 1117 (18687) 2013-08-17 01:43:14
#94 Forrest Gump (Polyphem) 1117 (38763) 2013-08-27 16:06:20
#95 Felix (Flix) 1117 (13712) 2013-08-27 18:16:41
#96 Steve (Samacian) 1116 (23804) 2013-09-05 06:14:13
#97 Gergely Simon (george314) 1116 (16555) 2013-09-27 20:49:54
#98 Alexander (cruachan) 1116 (16051) 2013-09-28 19:48:46
#99 Snake (snk) 1115 (77889) 2013-10-07 16:13:00
#100 Boris (Kaasu) 1115 (16566) 2013-10-18 18:57:48
#101 Swathi Pai (swathi3184) 1115 (3354) 2013-11-01 19:33:40
#102 Usha Narra (usha.narra) 1115 (2230) 2013-11-01 20:28:21
#103 Steve (pairate) 1115 (2230) 2013-11-03 22:40:52
#104 Fengjiao (Fengjiao) 1115 (2230) 2013-11-07 19:05:09
#105 Brad (braddrew) 1114 (15878) 2013-12-09 10:34:55
#106 Lucas (veered) 1113 (2226) 2013-12-28 10:58:36
#107 Alain (Integral) 1113 (207924) 2013-12-28 16:27:05
#108 jonathan (munz) 1113 (8954) 2013-12-30 22:54:06
#109 Csaba Fitzl (csaby) 1113 (6696) 2014-01-01 19:34:29
#110 Pavel (haw) 1113 (22728) 2014-01-12 19:31:51
#111 Michael Doucha (mdou) 1112 (13757) 2014-02-17 18:10:12
#112 Duy Khanh Dau (khanh45a3kct) 1111 (5783) 2014-03-11 00:06:26
#113 hellman (hellman) 1111 (14862) 2014-03-12 16:23:00
#114 caesar ([caesar]) 1111 (10738) 2014-03-23 22:53:52
#115 Karl Schutt (günter) 1111 (41550) 2014-03-30 17:34:31
#116 Igor (idipaolo) 1109 (10639) 2014-05-23 02:39:18
#117 Michael (pheenyx) 1109 (3840) 2014-05-23 21:51:34
#118 Francisco Moraes (fmoraes) 1109 (90044) 2014-07-05 05:29:35
#119 Manfred Wurm (Tschabobo) 1108 (8835) 2014-07-14 10:32:36
#120 julius gaius (julius) 1108 (25581) 2014-07-21 09:01:13
#121 Peter (51dc30ddc) 1108 (10916) 2014-07-23 23:05:35
#122 Robert (rm) 1108 (56475) 2014-07-31 22:18:25
#123 baz (oneiron) 1108 (12353) 2014-08-05 03:12:20
#124 Christof B. (beans90) 1108 (9488) 2014-08-16 17:11:46
#125 Alex (toincogni) 1107 (5055) 2014-09-22 22:34:36
#126 manodivya kathiravan (manodivya) 1106 (2212) 2014-10-28 18:58:46
#127 Samyuktha Tina (samyusridhar) 1106 (2218) 2014-11-07 20:08:56
#128 P (newgirl21) 1106 (2212) 2014-11-08 06:37:36
#129 Javantea (Javantea) 1106 (40816) 2014-11-11 03:42:46
#130 Julia Bernotat (El Greco ) 1106 (81129) 2014-11-26 01:00:48
#131 AnirudhAnand (lucif3r) 1105 (5445) 2015-01-09 09:17:23
#132 Kai Ludwig (TalentRaspel) 1105 (15704) 2015-01-10 16:19:05
#133 Claude Vaillancourt (Cl3v3r) 1104 (38351) 2015-01-20 15:56:55
#134 Shoukat (e195633) 1104 (10617) 2015-01-31 01:09:08
#135 Danny Higgins (hamster147) 1104 (33007) 2015-02-15 16:16:23
#136 Konstantin Golovan (SoulShaker) 1104 (14091) 2015-03-01 17:10:34
#137 R (r?) 1103 (6742) 2015-03-19 10:16:46
#138 Jeremy Chuang (jeremhh) 1103 (6643) 2015-03-19 13:32:28
#139 Rainer Zufall (kiekuk) 1103 (56786) 2015-04-01 10:15:15
#140 Brian Kieslich (briank) 1103 (6733) 2015-04-14 03:57:06
#141 S (Dingo_the_BB) 1103 (6534) 2015-04-15 21:20:18
#142 D (devilchn) 1102 (11142) 2015-06-14 21:45:04
#143 Erik (Erox) 1101 (23737) 2015-07-15 22:19:48
#144 J-L Morel (Rossignol) 1101 (29125) 2015-07-29 14:06:20
#145 Sean (Kavanaugh) 1101 (29143) 2015-08-13 20:08:19
#146 Kokx (kokx) 1101 (4810) 2015-09-07 13:56:44
#147 Ylona (Sirene) 1101 (4425) 2015-09-07 14:26:48
#148 Joerg G. (SnifferMaster) 1100 (18154) 2015-10-04 17:52:25
#149 Alain Collignon (vexilla72) 1100 (87833) 2015-10-08 11:07:52
#150 S Combes (jerva) 1100 (99132) 2015-10-24 20:29:53
#151 Martin (martinbucher) 1100 (27363) 2015-11-09 15:27:42
#152 Szabó Zoltán (szabo.z87) 1100 (55604) 2015-11-10 07:29:42
#153 Rainer (Rainer74) 1099 (8417) 2015-12-21 19:06:00
#154 Dominik M. (Sgt. Pepper) 1099 (97919) 2015-12-22 02:54:08
#155 T (Wagner) 1099 (16988) 2015-12-26 15:58:02
#156 Casaubon (cfreuden) 1099 (8515) 2016-01-13 15:28:13
#157 Vilius (wi_lius) 1098 (3497) 2016-02-14 12:53:46
#158 Andreas Frerichs (Ossili) 1098 (33266) 2016-02-17 19:11:02
#159 Ader (Vert) 1098 (2496) 2016-02-29 17:07:12
#160 Marco Manfredi (mkk9901) 1098 (17686) 2016-03-14 14:25:51
#161 Peter (Garnet) 1098 (14234) 2016-03-16 13:59:33
#162 Norbert Biermann (Norbert) 1096 (45031) 2016-07-05 22:32:23
#163 Ho Chung Siu (soarerz) 1096 (5314) 2016-07-06 07:02:56
#164 Vlatiha Romanova (Vlatiha) 1096 (10323) 2016-08-03 13:59:43
#165 CESH (cesh) 1096 (4995) 2016-08-18 20:13:56
#166 Wieland (wisch) 1096 (6633) 2016-08-20 12:18:42
#167 Flo (sealth) 1096 (13472) 2016-08-22 03:11:19
#168 Nicolas (nicosPavlov) 1095 (151166) 2016-09-29 17:17:52
#169 ender (endered) 1095 (5478) 2016-11-20 03:30:43
#170 neko (neko) 1095 (7679) 2016-11-20 03:38:47
#171 JoGo (JoGo) 1095 (11686) 2016-12-02 17:05:15
#172 Marcel (bene1512) 1094 (20896) 2017-01-07 19:02:11
#173 Michael (FoM) 1094 (38953) 2017-01-25 02:09:41
#174 Georgius Stolte (HazmatsFear) 1094 (15671) 2017-02-08 18:57:20
#175 Tristan1473 (Tristan1473) 1094 (18914) 2017-02-10 13:00:22
#176 Hans Joachim Girulat (joregi) 1094 (36279) 2017-02-25 19:40:49
#177 Mir Dim (mir0soft) 1093 (72404) 2017-03-12 14:37:52
#178 chris (c2) 1093 (51973) 2017-03-14 10:30:52
#179 Vaidotas (Hurrislt) 1093 (3579) 2017-03-21 15:49:11
#180 Daniel Walder (ibex) 1093 (14372) 2017-04-11 21:45:10
#181 Joel (joelhdzhdz) 1093 (3288) 2017-05-26 02:48:25
#182 john doe (misio) 1093 (7371) 2017-05-30 11:53:18
#183 Kasia (kasia-tutej) 1093 (53366) 2017-05-30 11:57:26
#184 Mihail (plexor) 1093 (16827) 2017-06-03 14:57:16
#185 D3d4lu5 (D3d4lu5) 1092 (278422) 2017-06-12 18:34:06
#186 Imam Uasa (Merricx) 1092 (9188) 2017-06-13 16:11:56
#187 NGUYEN Ngoc Ky (kynguyenngoc) 1092 (4974) 2017-06-18 18:14:11
#188 Akonia (Akonia12) 1092 (12153) 2017-07-16 16:38:47
#189 Moomin (Mushmom) 1092 (7674) 2017-07-19 13:47:03
#190 George Lasry (george4096) 1092 (299488) 2017-08-01 20:21:32
#191 juw (juw) 1092 (4179) 2017-08-11 10:54:58
#192 Immo Weber (MandelToast) 1092 (10061) 2017-08-19 18:15:32
#193 Kim H. S. (tenchijin) 1092 (25468) 2017-08-23 15:28:54
#194 Julian (Lemmynator) 1092 (16666) 2017-09-16 14:40:04
#195 Dmitry Eremin-Solenikov (lumag) 1091 (4482) 2017-10-16 15:40:39
#196 Tom Tox (tox) 1090 (17708) 2018-03-14 12:44:21
#197 Nofre Tete (noffi) 1090 (21921) 2018-03-16 16:53:06
#198 Steve Vaillancourt (stvai2) 1089 (15041) 2018-05-11 02:06:08
#199 Eric (ExAstris) 1089 (26990) 2018-05-17 02:15:07
#200 Silvia Kortmann (mikinsget) 1089 (10104) 2018-05-17 02:28:40
#201 Christophe BORELLY (cb34) 1089 (12358) 2018-06-06 09:16:16
#202 Durward McDonell (durward) 1089 (5265) 2018-06-13 17:56:41
#203 E41514050 (E41514050) 1089 (3870) 2018-07-07 11:30:30
#204 E41514023 (E41514023) 1089 (3967) 2018-07-07 15:00:55
#205 E41514013 (E41514013) 1089 (4167) 2018-07-08 09:57:01
#206 E41514006 (E41514006) 1089 (4957) 2018-07-08 10:09:58
#207 Lane Williams (planetlane) 1089 (23948) 2018-07-13 22:32:14
#208 Random Dude (rnd) 1089 (90929) 2018-08-07 02:01:25
#209 Ranee Oscar (roscar2018) 1088 (2176) 2018-09-06 07:10:46
#210 Steven Yen (styen510) 1088 (1088) 2018-10-09 22:10:15
#211 Manfred Paul (manf) 1088 (14774) 2018-11-14 00:01:22
#212 simone (xseris) 1087 (8432) 2019-02-16 10:59:08
#213 Lia (Lia) 1087 (6855) 2019-03-06 00:43:24
#214 whitecowboy (whitecowboy) 1087 (7446) 2019-03-06 13:11:55
#215 LoneWolf219 (LoneWolf219) 1087 (12795) 2019-03-08 02:48:40
#216 E41614031 (E41614031) 1087 (7526) 2019-03-10 13:11:59
#217 Klaus (kumaus) 1087 (21415) 2019-03-21 12:09:35
#218 Will (nitrow) 1087 (6807) 2019-03-21 15:42:03
#219 ykaridi (ykaridi) 1087 (7035) 2019-03-23 00:58:45
#220 schwuggel1337 (schwuggel1337) 1087 (7716) 2019-03-25 14:08:07
#221 E41614048 (E41614048) 1087 (4063) 2019-03-31 08:12:57
#222 madness (madness) 1087 (15407) 2019-04-03 04:26:19
#223 E41614056 (E41614056) 1087 (4062) 2019-04-08 14:27:57
#224 E41614018 (E41614018) 1087 (6243) 2019-04-10 18:49:44
#225 E41614046 (E41614046) 1087 (3862) 2019-04-11 07:34:14
#226 E41614068 (E41614068) 1087 (3868) 2019-04-11 10:44:06
#227 Marco Cinelli (Snap) 1086 (28365) 2019-05-14 16:17:24
#228 Mike (RogueRamblers) 1086 (26311) 2019-05-27 02:24:37
#229 Christian (MarquisDeSud) 1086 (7848) 2019-05-28 13:38:27
#230 ENOENT (ENOENT) 1086 (13478) 2019-05-31 18:49:17
#231 An Viet Pham (S1lv3r) 1086 (7927) 2019-06-08 13:54:19
#232 Eugene (lim0n) 1086 (38765) 2019-06-20 16:22:44
#233 Soutik Nandy (100tick) 1086 (5651) 2019-07-05 11:09:41
#234 yult (yult) 1086 (12185) 2019-07-11 13:49:44
#235 gerdw (gerdw) 1086 (16590) 2019-07-12 20:48:23
#236 Stephan (Stephje1978) 1086 (21710) 2019-07-20 18:16:56
#237 ajg (ludimus) 1086 (10128) 2019-07-22 17:48:24
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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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Dorabella

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

In 1897, the English composer Edward Elgar sent an encrypted message to a lover. So far, nobody has been able to decrypt it. This message is known today as the "Dorabella Cipher".
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Published on: 2010-10-14 13:30
Maximum number of attempts for this challenge: 0

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World Record Challenge: Break 65 Bits of AES

[schmeh-07] - 0 users already solved this challenge, 4 are working on it.
 
 
 

The longest key that has ever been publicly cracked by exhaustive key search was 64 bits long. The purpose of this challenge is to improve this world record by one bit.
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Published on: 2010-10-14 13:30
Maximum number of attempts for this challenge: 50

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Enigma Part 1

[stamp-04] - 116 users already solved this challenge, 16 are working on it.
 
 
 

Decrypt the given ciphertext which is encrypted with the Enigma chiper. The wanted key conists of the configuration of the Enigma. Please give the letters in the key as capital letters.
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Published on: 2010-10-14 13:30
Maximum number of attempts for this challenge: 15

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Rank User (#116) Achieved points (Global score) y-m-d - h:m:s

Nobody (nobody) 2000 (40618) 2010-10-14 13:32:17
Joachim Protze (joschi) 1576 (4877) 2010-10-19 17:40:41
Ralf Stephan (rwst) 1523 (25229) 2010-10-22 09:32:28
Thomas Schmucker (dg) 1502 (26066) 2010-10-22 19:47:08
#5 kyprizel (kyprizel) 1469 (20795) 2010-10-25 11:55:07
#6 Roadrunner (rr) 1456 (12702) 2010-10-25 14:08:20
#7 Jascha Koch (yosh) 1433 (2201) 2010-10-27 17:37:44
#8 TURINGBOMBE (TBREAKER) 1433 (10616) 2010-10-28 00:40:18
#9 Siggi Bartz (sbartz) 1423 (2892) 2010-10-28 14:18:22
#10 Nabb (Nabb) 1423 (13670) 2010-10-28 14:50:08
#11 Armin Krauss (argh) 1423 (185115) 2010-10-28 21:54:26
#12 Ulrich Armbrüster (uarmbruester) 1315 (7987) 2010-11-19 22:54:31
#13 Hans Schuell (hschuell) 1312 (2194) 2010-11-20 13:39:51
#14 Sven Ge (Sven-from-de) 1292 (2852) 2010-11-30 02:51:13
#15 Thomas Gonda (TomG) 1275 (36291) 2010-12-10 11:44:40
#16 mischa (mmisc) 1228 (22426) 2011-01-26 02:31:00
#17 David (aki321) 1224 (27482) 2011-02-01 15:09:03
#18 Wolfgang Weisser (wowmyst) 1208 (33108) 2011-03-03 23:50:25
#19 Arshi (arshi) 1201 (1201) 2011-03-21 07:57:07
#20 Darshan (darshonline) 1201 (1201) 2011-03-21 08:05:59
#21 Fabian Hemmer (llan) 1190 (7842) 2011-04-25 00:50:23
#22 David Horvath (horvathd) 1178 (2438) 2011-06-10 14:15:25
#23 J. M. (jomandi) 1178 (113270) 2011-06-10 19:25:15
#24 Martin Bauser (stef_the_chef) 1169 (4329) 2011-07-24 14:08:47
#25 Peter Mustermann (Gummiboot) 1169 (60285) 2011-07-28 23:26:15
#26 Seth Kintigh (DarkFibre) 1168 (79471) 2011-07-31 04:44:36
#27 Daniel Fretwell (fretty) 1166 (30107) 2011-08-13 16:46:31
#28 h3po (h3po) 1164 (20433) 2011-08-24 07:49:29
#29 Viktor (Veselovský) 1163 (151602) 2011-09-01 23:28:34
#30 Nicolas Golubovic (qll) 1162 (14919) 2011-09-07 23:24:41
#31 dbuq (dbuq) 1162 (22762) 2011-09-09 22:01:21
#32 jane_jeakcy (jane_jeakcy) 1157 (1157) 2011-10-14 18:09:26
#33 Bart den Hartog (Bart13) 1151 (132400) 2011-12-12 21:11:56
#34 Michael Gürtler (michaelg) 1144 (4128) 2012-02-18 16:49:39
#35 Hans Peter (hanspeter) 1142 (52256) 2012-03-14 10:58:03
#36 Jais (oliver43) 1141 (1743) 2012-04-04 19:41:56
#37 JBBom (hn51) 1141 (1442) 2012-04-04 19:57:29
#38 Kurt Gebauer (Yokozuna) 1141 (159388) 2012-04-06 17:42:48
#39 Keith Randall (randall77) 1140 (31011) 2012-04-13 18:53:46
#40 Michel Van Caneghem (vancan) 1139 (49719) 2012-04-26 15:34:32
#41 Dusan (xxdradus) 1137 (40236) 2012-06-04 11:19:33
#42 Luigi Tomelli (archstanton) 1136 (108345) 2012-06-08 11:28:03
#43 Thomas Lambert (lambert) 1132 (35237) 2012-08-25 18:07:15
#44 Stepan (m1sterx) 1131 (19165) 2012-08-29 07:17:43
#45 Roland Jansen (roland) 1128 (17607) 2012-10-28 15:11:41
#46 Xiaohan Li (feng7801) 1128 (1128) 2012-11-13 17:17:28
#47 E.T (Ertheb) 1127 (81809) 2012-12-05 21:31:35
#48 Nikki Brandt (nikki) 1123 (2348) 2013-03-12 08:23:22
#49 George (Theofanidis) 1122 (109124) 2013-03-15 14:30:23
#50 RPH (derichard) 1122 (27044) 2013-04-05 00:00:28
#51 Paul Duplys (pd) 1121 (1525) 2013-04-23 22:06:47
#52 Los (Gurt) 1121 (2742) 2013-04-24 20:24:57
#53 Felix (Flix) 1121 (13712) 2013-04-27 19:51:27
#54 Almut (problelmo) 1118 (45992) 2013-07-10 21:08:12
#55 chris_3stones (3stones) 1117 (37759) 2013-08-03 10:49:34
#56 zahir mohsen moradi (ariobarzan) 1117 (99757) 2013-08-27 17:27:36
#57 Hank (hanky) 1116 (22859) 2013-10-03 15:39:08
#58 Forrest Gump (Polyphem) 1115 (38763) 2013-10-05 02:05:16
#59 Em Doulgerakis (Greko) 1115 (124033) 2013-10-08 21:13:20
#60 Steve (Samacian) 1115 (23804) 2013-10-10 03:52:10
#61 Francisco Moraes (fmoraes) 1115 (90044) 2013-11-06 16:47:57
#62 Liang Wu (leonwu) 1115 (1115) 2013-11-07 23:45:22
#63 Michael Möller (michaelm) 1114 (173129) 2013-11-08 16:13:09
#64 Norbert Paefgen (egebamyasi) 1114 (2728) 2013-11-27 20:49:01
#65 Jim Gillogly (Scryer) 1114 (21260) 2013-12-05 04:07:18
#66 George Robinson (osric) 1113 (1413) 2013-12-19 18:52:39
#67 Alain (Integral) 1113 (207924) 2013-12-20 14:51:31
#68 jonathan (munz) 1113 (8954) 2014-01-06 03:41:35
#69 Marcel (bene1512) 1112 (20896) 2014-02-16 18:46:16
#70 Snake (snk) 1108 (77889) 2014-07-16 12:26:14
#71 baz (oneiron) 1108 (12353) 2014-08-08 01:14:32
#72 julius gaius (julius) 1107 (25581) 2014-08-23 21:52:21
#73 Robert (rm) 1107 (56475) 2014-09-19 12:06:45
#74 jej (stationz) 1106 (4939) 2014-11-08 18:08:06
#75 Julia Bernotat (El Greco ) 1106 (81129) 2014-11-18 21:23:24
#76 Pavel (haw) 1105 (22728) 2014-12-05 23:28:25
#77 Kai Ludwig (TalentRaspel) 1105 (15704) 2015-01-18 00:02:39
#78 S Combes (jerva) 1104 (99132) 2015-01-25 20:09:15
#79 Georgius Stolte (HazmatsFear) 1104 (15671) 2015-02-18 19:36:12
#80 Bernhard Gruber (bgr) 1104 (22889) 2015-02-23 19:06:17
#81 Rainer Zufall (kiekuk) 1104 (56786) 2015-02-26 19:01:19
#82 Tien (tn9900) 1104 (1104) 2015-03-14 00:53:10
#83 Hans Joachim Girulat (joregi) 1103 (36279) 2015-04-05 22:13:46
#84 DirkS (Dustman) 1103 (8479) 2015-04-08 13:52:41
#85 Karl Schutt (günter) 1103 (41550) 2015-04-11 11:57:31
#86 KW (qwer*) 1102 (13963) 2015-06-27 10:42:36
#87 Claude Vaillancourt (Cl3v3r) 1100 (38351) 2015-09-25 14:20:36
#88 J-L Morel (Rossignol) 1100 (29125) 2015-10-10 14:36:39
#89 Alain Collignon (vexilla72) 1099 (87833) 2016-01-12 11:30:42
#90 Szabó Zoltán (szabo.z87) 1099 (55604) 2016-01-20 20:19:47
#91 Nofre Tete (noffi) 1099 (21921) 2016-01-22 17:15:40
#92 Andreas Frerichs (Ossili) 1098 (33266) 2016-02-08 20:31:22
#93 Marco Manfredi (mkk9901) 1098 (17686) 2016-03-25 11:05:42
#94 Erik (Erox) 1097 (23737) 2016-04-16 22:12:29
#95 Javantea (Javantea) 1096 (40816) 2016-07-07 21:02:35
#96 Norbert Biermann (Norbert) 1096 (45031) 2016-08-23 18:47:02
#97 Mirko Rendey (Biork) 1095 (6595) 2016-09-20 12:27:36
#98 HeinzelMann (Ohm) 1095 (5295) 2016-09-20 12:28:51
#99 Nicolas (nicosPavlov) 1095 (151166) 2016-10-16 12:52:22
#100 Tristan1473 (Tristan1473) 1094 (18914) 2017-02-19 12:49:32
#101 Mir Dim (mir0soft) 1093 (72404) 2017-03-20 18:40:33
#102 Raksha (Scorpio) 1093 (1093) 2017-03-23 02:40:47
#103 Nishanth Reddy (Nishi549) 1093 (1093) 2017-03-23 02:43:39
#104 Dominik M. (Sgt. Pepper) 1093 (97919) 2017-03-27 02:05:50
#105 chris (c2) 1093 (51973) 2017-03-27 09:16:07
#106 Daniel Walder (ibex) 1093 (14372) 2017-05-03 22:36:07
#107 Kasia (kasia-tutej) 1092 (53366) 2017-06-27 09:28:49
#108 D3d4lu5 (D3d4lu5) 1092 (278422) 2017-07-05 01:06:51
#109 S P (sp314) 1092 (1092) 2017-08-02 02:33:44
#110 Kim H. S. (tenchijin) 1092 (25468) 2017-08-23 18:21:11
#111 Martin (martinbucher) 1091 (27363) 2017-10-29 14:50:57
#112 Julian (Lemmynator) 1089 (16666) 2018-07-27 15:52:15
#113 Random Dude (rnd) 1088 (90929) 2018-08-21 23:12:34
#114 zuben c3 (zuben-c3) 1087 (24853) 2019-01-12 09:32:48
#115 Michael (FoM) 1087 (38953) 2019-01-26 18:04:36
#116 Mike (RogueRamblers) 1087 (26311) 2019-03-16 07:03:20
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   +++    [14:32 - 23.07.2019] MarVardoul solved the Level I challenge 'Number Sequence'    +++    [12:53 - 23.07.2019] ludimus solved the Level I challenge 'Modified Caesar Cipher'    +++    [10:23 - 23.07.2019] ludimus solved the Level II challenge 'Not-so-Secret Message from Malawi — Part I (RSA)'    +++    [09:52 - 23.07.2019] yann solved the Level I challenge 'Advent-Challenge — Part 1'    +++    [07:38 - 23.07.2019] Yokozuna solved the Level II challenge 'The T52 Sturgeon Challenge — Part 3'    +++