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 (269)

Ordered by date posted, the most recent appear first.

From Russia with Love

[gysler-01] - 224 users already solved this challenge, 18 are working on it.
 
 
 

Sarah and Igor are exchange students. Sarah lives in Moscow while Igor is in Berlin. To keep their little secrets confidential, they encrypt their emails. Decrypt the message to find out what Sarah wrote this time.
Read more...

Click here to get to the corresponding forum topic to share your opinion.
Click here to download the challenge.

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-09-04 14:30
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#224) Achieved points (Global score) y-m-d - h:m:s

Armin Krauss (argh) 200 (175390) 2013-09-04 14:45:09
J. M. (jomandi) 200 (113270) 2013-09-04 16:39:17
Snake (snk) 200 (72164) 2013-09-04 17:09:40
Em Doulgerakis (Greko) 200 (124033) 2013-09-04 17:42:51
#5 H. Lautenschlager (helmi) 200 (29022) 2013-09-04 18:09:07
#6 E.T (Ertheb) 200 (71517) 2013-09-04 18:39:36
#7 George (Theofanidis) 200 (101521) 2013-09-04 19:36:21
#8 Kurt Gebauer (Yokozuna) 200 (146278) 2013-09-04 23:29:58
#9 masam (jimboo) 200 (18687) 2013-09-04 23:40:52
#10 Hans Peter (hanspeter) 200 (52256) 2013-09-05 11:58:42
#11 Michael Möller (michaelm) 150 (169404) 2013-09-05 16:19:35
#12 Petra (humppapenguin) 150 (3872) 2013-09-05 18:21:01
#13 David (aki321) 150 (27482) 2013-09-06 13:02:44
#14 Andreas Wolff (timberwolff) 133 (1340) 2013-09-06 19:19:23
#15 Thomas Lambert (lambert) 133 (35237) 2013-09-06 20:44:09
#16 zahir mohsen moradi (ariobarzan) 133 (99757) 2013-09-07 13:16:42
#17 Luigi Tomelli (archstanton) 125 (108345) 2013-09-08 10:18:49
#18 Viktor (Veselovský) 120 (142053) 2013-09-08 19:33:52
#19 Sebastian Slupina (Grandwizard) 120 (10866) 2013-09-09 10:22:15
#20 Forrest Gump (Polyphem) 117 (38763) 2013-09-09 16:40:51
#21 Bart den Hartog (Bart13) 117 (118984) 2013-09-09 18:38:40
#22 Holti (Holti) 117 (6035) 2013-09-09 21:12:04
#23 stefan (wolperting) 111 (111) 2013-09-12 20:33:50
#24 Alexander (cruachan) 111 (16051) 2013-09-13 00:42:10
#25 liesinha (liesinha) 111 (111) 2013-09-13 13:00:42
#26 Benedikt M. (bm91) 109 (4112) 2013-09-14 16:02:49
#27 KW (qwer*) 108 (13963) 2013-09-15 20:49:36
#28 DirkS (Dustman) 108 (8479) 2013-09-16 15:04:03
#29 Bernhard Gruber (bgr) 108 (22889) 2013-09-16 18:12:04
#30 Julien (deserting) 107 (207) 2013-09-18 17:20:27
#31 Anton (IILaryII) 106 (409) 2013-09-19 17:39:24
#32 Hank (hanky) 105 (22859) 2013-09-23 17:45:48
#33 Gergely Simon (george314) 104 (16555) 2013-09-26 22:10:09
#34 Thomas (Gonuzul) 104 (304) 2013-09-30 23:14:29
#35 Erich (ErichSt) 104 (4862) 2013-10-01 21:21:10
#36 Ethlaron (Ethlaron) 103 (1253) 2013-10-07 19:59:40
#37 Georg Dietze (Poramyco) 103 (211) 2013-10-09 12:47:53
#38 Sascha (DoctorHell) 103 (1305) 2013-10-12 12:11:21
#39 Steve (Samacian) 103 (23804) 2013-10-14 07:30:58
#40 Stuart Barton (knerve) 102 (207) 2013-10-14 22:24:12
#41 Paul (pgilbert) 102 (657) 2013-10-15 00:56:02
#42 Timo (Amarth) 102 (831) 2013-10-15 20:09:01
#43 Philipp (Irrlicht2142) 102 (303) 2013-10-16 18:30:37
#44 Laura (Weltenwandlerin) 102 (1004) 2013-10-17 20:41:26
#45 Manfred Wurm (Tschabobo) 102 (8835) 2013-10-29 21:45:55
#46 Andrew (Agromania) 102 (4508) 2013-11-01 06:07:32
#47 Hannes Nötzli (Faust) 102 (4781) 2013-11-03 15:09:00
#48 Seth Kintigh (DarkFibre) 102 (79471) 2013-11-04 05:29:19
#49 j.h. (haegarq) 101 (15252) 2013-11-15 10:22:34
#50 David Deininger (Riyil) 101 (101) 2013-11-15 19:37:43
#51 Marco (ccw) 101 (101) 2013-11-16 23:01:18
#52 Dusan (xxdradus) 101 (40236) 2013-11-21 18:53:58
#53 Joost (Joost) 101 (2653) 2013-11-26 14:42:06
#54 Dennis (Antipattern) 101 (301) 2013-11-28 16:05:31
#55 George Lasry (george4096) 101 (292103) 2013-12-03 17:13:54
#56 artmagic (artmagic) 101 (6298) 2013-12-03 18:01:18
#57 Jim Gillogly (Scryer) 101 (21260) 2013-12-06 04:03:11
#58 cworstell (ace2) 101 (4870) 2013-12-08 18:28:02
#59 Max Mustermann (MustermM) 101 (6661) 2013-12-11 16:04:05
#60 teifi (teifi) 101 (2251) 2013-12-13 21:33:37
#61 Alain (Integral) 101 (207924) 2013-12-16 11:42:58
#62 A R (Gorbag) 101 (2037) 2013-12-17 12:55:25
#63 Carsten Stach (Pug-Dog) 101 (101) 2013-12-18 19:42:25
#64 Nils (NiKo) 101 (5055) 2013-12-20 20:49:09
#65 Marcel (lecram) 101 (101) 2013-12-22 18:18:46
#66 Kim H. S. (tenchijin) 101 (25468) 2014-01-05 08:39:06
#67 Pavel (haw) 101 (22728) 2014-01-13 18:47:54
#68 fkronber (ketas) 101 (2148) 2014-01-16 21:46:55
#69 Almut (problelmo) 101 (45992) 2014-01-30 20:30:21
#70 Flo (0knowledge) 101 (902) 2014-02-02 22:45:05
#71 Marcel (bene1512) 101 (20896) 2014-02-08 10:12:31
#72 Ralf Stephan (rwst) 101 (25229) 2014-02-08 17:55:24
#73 Bertold (bk) 101 (9673) 2014-02-09 18:30:39
#74 Moritz Stocker (Trismegistos) 101 (2471) 2014-02-10 11:45:35
#75 Joerg Schaeffler (DrAcula) 101 (2948) 2014-02-23 19:38:03
#76 Sascha (The Hoddich) 101 (4350) 2014-02-24 10:59:44
#77 Andrea (hoffionline) 101 (101) 2014-03-04 19:19:54
#78 RPH (derichard) 101 (27044) 2014-03-22 18:27:40
#79 Karl Schutt (günter) 100 (41550) 2014-03-23 17:06:37
#80 Simone (Momo) 100 (5478) 2014-04-09 12:49:42
#81 Siggi Kraus (Kruxi) 100 (701) 2014-04-26 16:03:36
#82 Felix Starke (fs_lol) 100 (200) 2014-04-30 21:07:05
#83 Joe (IlmJoe) 100 (2938) 2014-05-09 10:40:55
#84 Michel Van Caneghem (vancan) 100 (49719) 2014-05-26 10:18:17
#85 Tina (BTina) 100 (1500) 2014-06-01 19:04:16
#86 caesar ([caesar]) 100 (10738) 2014-06-09 16:46:44
#87 Lutz Sittinger (Kryptolutz) 100 (1802) 2014-06-15 14:49:40
#88 Francisco Moraes (fmoraes) 100 (90044) 2014-07-01 21:08:39
#89 Julia Bernotat (El Greco ) 100 (81129) 2014-07-01 22:43:00
#90 julius gaius (julius) 100 (25581) 2014-07-21 17:49:44
#91 Hughes (hughes) 100 (4735) 2014-07-23 16:34:36
#92 Robert (rm) 100 (56475) 2014-07-31 22:29:56
#93 Thomas Gonda (TomG) 100 (36291) 2014-08-28 21:33:47
#94 Andreas Frerichs (Ossili) 100 (33266) 2014-09-04 15:57:37
#95 Kerstin (herzchen412) 100 (3937) 2014-09-10 12:42:27
#96 Tim Fink (Magellan) 100 (4876) 2014-09-21 17:58:47
#97 Lane Williams (planetlane) 100 (21611) 2014-09-29 18:49:20
#98 Julia Werdelmann (jw) 100 (10407) 2014-12-05 23:50:13
#99 Timo (Conundraah) 100 (400) 2014-12-14 22:52:22
#100 HolgerK (HolgerK) 100 (25776) 2014-12-22 23:41:58
#101 Kai Ludwig (TalentRaspel) 100 (15704) 2015-01-06 19:24:46
#102 Hans Joachim Girulat (joregi) 100 (33493) 2015-01-12 00:00:25
#103 Danny Higgins (hamster147) 100 (22117) 2015-01-20 01:30:37
#104 timon (timonsuppi) 100 (100) 2015-01-23 23:09:03
#105 Vlatiha Romanova (Vlatiha) 100 (10323) 2015-02-10 12:17:15
#106 Tom Tox (tox) 100 (17708) 2015-02-13 20:52:45
#107 Georgius Stolte (HazmatsFear) 100 (15671) 2015-02-16 16:30:11
#108 Muendo (muendo) 100 (3501) 2015-02-24 12:42:56
#109 Rainer Zufall (kiekuk) 100 (56786) 2015-02-25 10:38:33
#110 Piotr Bałdyga (Vorgell) 100 (100) 2015-02-27 00:21:49
#111 Marta (argo916) 100 (501) 2015-02-27 15:54:13
#112 Stepan (m1sterx) 100 (19165) 2015-03-04 09:05:17
#113 Patrick Renz (tarantulla) 100 (2027) 2015-03-30 12:23:30
#114 Brian Kieslich (briank) 100 (6733) 2015-04-10 17:04:48
#115 Peter (Garnet) 100 (14234) 2015-04-21 19:07:51
#116 Tolfa (xXitZPvPLPHDXx) 100 (200) 2015-05-07 09:05:08
#117 Pascal (CakePopKryptograf) 100 (100) 2015-05-07 11:39:34
#118 Manna (Backsuchtis) 100 (300) 2015-05-07 11:54:44
#119 Lennart (Penthesilea) 100 (4110) 2015-05-13 20:22:32
#120 partamier (yann) 100 (5435) 2015-05-13 21:20:20
#121 Michael Ammon (Ammonym) 100 (7719) 2015-06-04 01:33:55
#122 Mikaela Bergstedt (Millie82) 100 (200) 2015-07-08 14:23:26
#123 Mark van Heeswijk (markvh) 100 (2600) 2015-07-08 16:55:36
#124 Helene (Audun) 100 (701) 2015-07-14 01:42:48
#125 Erik (Erox) 100 (22651) 2015-07-16 22:29:10
#126 chris_3stones (3stones) 100 (37759) 2015-09-06 08:03:22
#127 Sirius (Leznar) 100 (4552) 2015-09-13 09:15:18
#128 Alain Collignon (vexilla72) 100 (80284) 2015-10-01 16:13:11
#129 J-L Morel (Rossignol) 100 (29125) 2015-10-05 16:10:19
#130 Joerg G. (SnifferMaster) 100 (18154) 2015-10-11 08:51:21
#131 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-03 06:04:12
#132 Martin (martinbucher) 100 (27363) 2015-11-08 08:01:21
#133 David (dave64) 100 (100) 2015-11-13 20:37:22
#134 S (Zyphe) 100 (10461) 2015-11-22 16:28:15
#135 Martina (BonoV) 100 (3017) 2015-11-23 18:01:52
#136 Joog (Joog) 100 (1208) 2015-12-07 14:48:14
#137 Andre Mueller (amueller) 100 (3215) 2015-12-20 10:17:27
#138 Imam Uasa (Merricx) 100 (9188) 2015-12-24 09:12:29
#139 nori (nori) 100 (400) 2015-12-26 17:53:21
#140 Casaubon (cfreuden) 100 (8515) 2016-01-13 16:26:02
#141 Marc (rcll0891) 100 (22180) 2016-01-19 16:42:46
#142 Peter Horner (Peer) 100 (4764) 2016-01-22 08:20:44
#143 Nofre Tete (noffi) 100 (21921) 2016-01-23 01:39:20
#144 D (devilchn) 100 (11142) 2016-02-09 23:09:26
#145 Ines (bufo01) 100 (4515) 2016-03-13 20:40:20
#146 Dominik M. (Sgt. Pepper) 100 (89042) 2016-03-18 19:48:57
#147 Steph (Tartaglia) 100 (2010) 2016-06-04 00:03:34
#148 Norbert Biermann (Norbert) 100 (44430) 2016-07-07 22:39:56
#149 Hajoe (Tintin-Muc) 100 (6923) 2016-08-04 11:17:25
#150 Flo (sealth) 100 (13472) 2016-08-22 17:30:54
#151 leo (leo_mgt) 100 (1407) 2016-08-29 04:35:35
#152 Schmidtke (Bigoli98) 100 (300) 2016-08-31 22:16:10
#153 Luciano Ignaczak (CryptoClass) 100 (3505) 2016-09-02 00:08:28
#154 Marcin Zawadzki (harry007) 100 (3012) 2016-09-15 19:41:01
#155 Nicolas (nicosPavlov) 100 (151166) 2016-09-29 02:41:03
#156 Kai Fischell (MrFlector) 100 (1433) 2016-09-29 14:32:20
#157 Daniel Walder (ibex) 100 (14372) 2016-09-30 14:43:08
#158 Meine Registrierung (TryC3) 100 (6045) 2016-10-08 20:05:31
#159 Kanndir Egalsein (Istauch Nichtwichtig) 100 (100) 2016-10-13 18:26:09
#160 Mirko Rendey (Biork) 100 (6295) 2016-10-14 17:29:33
#161 Darchicourt (Darki) 100 (3308) 2016-10-17 14:50:58
#162 Wall (Hadrian) 100 (4098) 2016-11-15 22:10:27
#163 Javantea (Javantea) 100 (40816) 2016-11-19 11:01:52
#164 Simon Jakob (simon.jakob) 100 (18714) 2016-11-27 01:56:21
#165 Michael (FoM) 100 (34465) 2016-11-29 00:32:57
#166 JoGo (JoGo) 100 (11686) 2016-12-02 21:26:38
#167 zuben c3 (zuben-c3) 100 (24853) 2016-12-06 11:06:23
#168 Creat1veM1ind (sokrates) 100 (2639) 2016-12-08 18:52:18
#169 Julian (Lemmynator) 100 (16666) 2017-01-28 00:25:25
#170 crypto (crypto31082000) 100 (300) 2017-02-11 21:36:13
#171 Andromeda (Andromeda) 100 (1604) 2017-02-12 10:29:10
#172 Mir Dim (mir0soft) 100 (72404) 2017-03-12 20:52:54
#173 eduardo (edureichert) 100 (2602) 2017-03-13 01:55:02
#174 chris (c2) 100 (51973) 2017-03-17 09:00:40
#175 Luciano Ignaczak (CryptoClass2017) 100 (3798) 2017-03-20 02:32:48
#176 sarah b (silva) 100 (14059) 2017-03-24 21:07:37
#177 Ruby Tuesday (rubytuesday) 100 (400) 2017-04-01 00:10:48
#178 Michael Jeffrey (empjay) 100 (3004) 2017-05-07 00:30:30
#179 D3d4lu5 (D3d4lu5) 100 (260853) 2017-06-11 02:34:00
#180 WF (f077) 100 (6874) 2017-07-16 10:58:47
#181 Moomin (Mushmom) 100 (7674) 2017-07-19 14:19:30
#182 Akonia (Akonia12) 100 (12153) 2017-07-19 21:20:08
#183 Kurona (Kurona) 100 (1100) 2017-08-27 16:27:51
#184 Mihail (plexor) 100 (16827) 2017-10-09 19:54:33
#185 nimroth (nimroth cynthor) 100 (6021) 2017-11-21 22:57:57
#186 Dusan Djuric (flapjack) 100 (2104) 2017-12-30 11:32:23
#187 Samuel (Samusicus) 100 (2203) 2018-01-04 12:49:18
#188 Pen (justtesting) 100 (1697) 2018-01-12 14:21:04
#189 Christof Kleber (Loki) 100 (6051) 2018-01-17 15:03:46
#190 R (ender_weniger) 100 (1598) 2018-02-02 17:11:27
#191 aysxdcfv (aysxdcfv) 100 (600) 2018-02-20 11:06:31
#192 Julian (Ju1703) 100 (4190) 2018-02-27 10:48:06
#193 Felipe Costa Batista (felippec) 100 (1398) 2018-03-21 17:15:38
#194 Thomas (Thomas4897) 100 (6596) 2018-03-29 09:15:26
#195 Helmut (bonsai) 100 (3890) 2018-03-31 22:00:10
#196 Lara Riegelhofer (larrow_sparrow) 100 (2798) 2018-04-02 23:10:15
#197 Benjamin (200611736) 100 (10086) 2018-04-10 23:41:34
#198 Steve Vaillancourt (stvai2) 100 (15041) 2018-04-29 01:31:24
#199 Eric (ExAstris) 100 (26990) 2018-05-16 03:01:17
#200 Fedilia (Fedilia) 100 (4489) 2018-06-09 18:54:13
#201 Simon Kirchner (Twistios) 100 (3088) 2018-06-19 21:11:24
#202 Random Dude (rnd) 100 (77973) 2018-06-25 03:11:31
#203 HowarthStudios (HowarthStudios) 100 (3496) 2018-09-09 23:08:12
#204 Nicolas Porto (nicretr0) 100 (300) 2018-09-10 22:04:50
#205 Tiago Rodeghiero (Tiago Rodeghiero) 100 (901) 2018-09-12 01:58:01
#206 João Vaz Martins (Awakening Star) 100 (4561) 2018-10-25 07:06:05
#207 Ekrem Aydin (Eko115) 100 (1105) 2018-10-26 20:30:09
#208 madness (madness) 100 (15307) 2018-11-15 12:31:21
#209 Pierre Robier (tripleedged) 100 (5916) 2018-11-24 23:11:55
#210 Clemens (16dombrowski) 100 (5136) 2018-12-15 14:58:13
#211 Svetlana Lessin (16Lessin) 100 (2294) 2018-12-17 20:35:22
#212 Alex (Meiny) 100 (5136) 2018-12-17 23:50:47
#213 Bertolo (Bertolo) 100 (7167) 2019-01-05 19:03:30
#214 Piotr (lesnik7) 100 (7971) 2019-01-12 09:39:22
#215 Thomas Schlögl (slog) 100 (400) 2019-02-06 20:59:56
#216 Kevin Weber (ThunderArmy) 100 (7783) 2019-02-06 21:00:32
#217 simone (xseris) 100 (8432) 2019-02-15 22:00:21
#218 LoneWolf219 (LoneWolf219) 100 (12795) 2019-02-23 05:42:38
#219 Lia (Lia) 100 (6855) 2019-03-12 16:34:22
#220 Mike (RogueRamblers) 100 (9347) 2019-03-14 21:00:47
#221 Piyush Agarwal (Piyushgrwl) 100 (3493) 2019-03-21 00:16:07
#222 Aureo (Aureo) 100 (200) 2019-03-21 21:22:25
#223 Klaus (kumaus) 100 (21415) 2019-04-03 15:56:02
#224 Christian (MarquisDeSud) 100 (4488) 2019-04-12 08:47:09
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Nils away on travel

[griese-01] - 132 users already solved this challenge, 11 are working on it.
 
 
 

Nils would like to go on a journey and has given you a note with information about his destination. The note is encrypted. Can you find out where he would like to go?
Read more...

Click here to get to the corresponding forum topic to share your opinion.
Click here to download 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.
Published on: 2013-08-08 13:00
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#132) Achieved points (Global score) y-m-d - h:m:s

Armin Krauss (argh) 200 (175390) 2013-08-08 13:22:19
Viktor (Veselovský) 200 (142053) 2013-08-08 13:43:45
J. M. (jomandi) 200 (113270) 2013-08-08 14:10:14
Em Doulgerakis (Greko) 200 (124033) 2013-08-08 14:39:32
#5 Daniel Fretwell (fretty) 200 (30107) 2013-08-08 15:30:58
#6 Snake (snk) 200 (72164) 2013-08-08 18:28:31
#7 j.h. (haegarq) 200 (15252) 2013-08-08 18:38:33
#8 dbuq (dbuq) 200 (22762) 2013-08-08 19:19:39
#9 George (Theofanidis) 200 (101521) 2013-08-08 21:19:18
#10 Bernhard Gruber (bgr) 200 (22889) 2013-08-09 00:16:52
#11 Kurt Gebauer (Yokozuna) 200 (146278) 2013-08-09 10:04:11
#12 Hans Peter (hanspeter) 200 (52256) 2013-08-09 11:02:41
#13 Bart den Hartog (Bart13) 200 (118984) 2013-08-09 11:09:25
#14 H. Lautenschlager (helmi) 200 (29022) 2013-08-09 11:14:27
#15 E.T (Ertheb) 200 (71517) 2013-08-09 12:15:21
#16 Michael Möller (michaelm) 150 (169404) 2013-08-09 13:07:56
#17 Luigi Tomelli (archstanton) 150 (108345) 2013-08-09 14:17:07
#18 David (aki321) 133 (27482) 2013-08-10 23:16:34
#19 Roland Jansen (roland) 133 (17607) 2013-08-11 11:08:43
#20 Thomas Lambert (lambert) 125 (35237) 2013-08-11 17:30:42
#21 masam (jimboo) 125 (18687) 2013-08-12 01:38:04
#22 Philipp Hammer-Pohlau (phase2) 114 (17981) 2013-08-15 11:25:16
#23 Almut (problelmo) 111 (45992) 2013-08-16 20:17:14
#24 Sebastian Slupina (Grandwizard) 108 (10866) 2013-08-20 08:49:05
#25 cyclops (cyclops) 108 (2549) 2013-08-20 16:38:47
#26 ABo (LordPresident) 107 (409) 2013-08-22 20:08:52
#27 Petra (humppapenguin) 105 (3872) 2013-08-27 01:34:37
#28 Andreas Wolff (timberwolff) 103 (1340) 2013-09-06 19:45:20
#29 Anton (IILaryII) 102 (409) 2013-09-19 19:45:24
#30 Hank (hanky) 102 (22859) 2013-09-23 20:18:08
#31 Johannes Gasser (Belthegor) 102 (102) 2013-10-02 09:51:53
#32 Gergely Simon (george314) 102 (16555) 2013-10-04 00:22:11
#33 Steve (Samacian) 102 (23804) 2013-10-11 01:50:27
#34 Paul (pgilbert) 101 (657) 2013-10-15 03:58:23
#35 Timo (Amarth) 101 (831) 2013-10-15 20:20:37
#36 Philipp (Irrlicht2142) 101 (303) 2013-10-15 23:26:30
#37 Hannes Nötzli (Faust) 101 (4781) 2013-11-07 12:29:52
#38 Dusan (xxdradus) 101 (40236) 2013-11-24 21:14:39
#39 George Lasry (george4096) 101 (292103) 2013-12-03 17:21:55
#40 cworstell (ace2) 101 (4870) 2013-12-08 19:33:47
#41 KW (qwer*) 101 (13963) 2013-12-10 20:37:26
#42 Alain (Integral) 101 (207924) 2014-01-04 21:04:43
#43 Lucy (Ultramarin) 101 (2009) 2014-01-06 02:15:10
#44 Pavel (haw) 101 (22728) 2014-01-15 18:38:10
#45 Paul Wagner (Sequence1) 101 (602) 2014-01-23 16:29:01
#46 Forrest Gump (Polyphem) 101 (38763) 2014-01-29 13:02:21
#47 Josef Gillhuber (jogimi51) 101 (2446) 2014-01-30 20:14:16
#48 Bertold (bk) 101 (9673) 2014-01-30 21:46:54
#49 Marcel (bene1512) 101 (20896) 2014-02-05 15:09:05
#50 Sascha (The Hoddich) 100 (4350) 2014-02-24 15:21:32
#51 Ernesta (nesta) 100 (3359) 2014-02-25 18:57:02
#52 Tomas (Deathdealer) 100 (3060) 2014-03-02 15:30:12
#53 Joerg Schaeffler (DrAcula) 100 (2948) 2014-03-07 23:51:52
#54 Ben (Paulsen) 100 (2421) 2014-03-15 18:33:15
#55 RPH (derichard) 100 (27044) 2014-03-23 23:32:24
#56 Karl Schutt (günter) 100 (41550) 2014-04-19 15:41:47
#57 Felix Starke (fs_lol) 100 (200) 2014-04-30 21:35:28
#58 Aivaras (TaiAivaras) 100 (500) 2014-05-20 22:05:17
#59 Michel Van Caneghem (vancan) 100 (49719) 2014-05-27 16:27:39
#60 Tina (BTina) 100 (1500) 2014-06-01 21:26:42
#61 Francisco Moraes (fmoraes) 100 (90044) 2014-07-11 04:51:03
#62 julius gaius (julius) 100 (25581) 2014-07-27 22:38:57
#63 Julia Bernotat (El Greco ) 100 (81129) 2014-07-30 22:30:07
#64 Robert (rm) 100 (56475) 2014-07-31 22:39:23
#65 Simone (Momo) 100 (5478) 2014-08-17 21:34:14
#66 Thomas Gonda (TomG) 100 (36291) 2014-08-30 21:52:46
#67 Tim Fink (Magellan) 100 (4876) 2014-09-22 17:33:13
#68 Hugo Norris (Darkmugel) 100 (200) 2014-12-16 16:45:08
#69 HolgerK (HolgerK) 100 (25776) 2014-12-22 23:41:23
#70 Hans Joachim Girulat (joregi) 100 (33493) 2015-01-07 23:00:43
#71 Karsten (Karsten) 100 (100) 2015-01-07 23:20:11
#72 micaman (micaman) 100 (4634) 2015-02-18 20:17:16
#73 mirth23 (mirth23) 100 (7050) 2015-02-23 03:33:47
#74 Rainer Zufall (kiekuk) 100 (56786) 2015-02-28 00:13:38
#75 Andreas Frerichs (Ossili) 100 (33266) 2015-03-13 21:49:52
#76 Palash Chatterjee (brut3f0rc3) 100 (600) 2015-03-25 13:39:06
#77 partamier (yann) 100 (5435) 2015-05-15 17:47:00
#78 Georgius Stolte (HazmatsFear) 100 (15671) 2015-06-02 13:34:36
#79 Michael Ammon (Ammonym) 100 (7719) 2015-06-13 13:01:58
#80 Defekt75 (Defekt75) 100 (4325) 2015-06-14 10:35:46
#81 zahir mohsen moradi (ariobarzan) 100 (99757) 2015-09-02 17:27:41
#82 Claude Vaillancourt (Cl3v3r) 100 (38351) 2015-09-18 16:28:53
#83 S (Zyphe) 100 (10461) 2015-11-01 21:19:48
#84 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-02 08:07:07
#85 Ulrich Dorobeck (Papageno) 100 (3827) 2015-11-03 12:44:25
#86 Helene (Audun) 100 (701) 2015-12-01 08:01:09
#87 Marc (rcll0891) 100 (22180) 2016-01-03 15:39:06
#88 Nofre Tete (noffi) 100 (21921) 2016-02-04 18:12:23
#89 Ines (bufo01) 100 (4515) 2016-03-28 14:28:11
#90 Felix (Flix) 100 (13712) 2016-04-09 12:48:37
#91 Sirius (Leznar) 100 (4552) 2016-04-09 15:36:08
#92 Martina (BonoV) 100 (3017) 2016-05-19 18:24:18
#93 J-L Morel (Rossignol) 100 (29125) 2016-07-10 10:07:23
#94 Norbert Biermann (Norbert) 100 (44430) 2016-07-16 16:32:49
#95 Rene (Renederberserker) 100 (800) 2016-08-21 20:30:45
#96 Peter (Garnet) 100 (14234) 2016-09-30 09:13:23
#97 Alain Collignon (vexilla72) 100 (80284) 2016-09-30 18:07:37
#98 Mirko Rendey (Biork) 100 (6295) 2016-10-04 12:48:47
#99 HeinzelMann (Ohm) 100 (5295) 2016-10-04 12:50:28
#100 Dominik M. (Sgt. Pepper) 100 (89042) 2016-10-13 23:23:26
#101 Nicolas (nicosPavlov) 100 (151166) 2016-10-30 08:59:52
#102 Hajoe (Tintin-Muc) 100 (6923) 2016-11-09 19:56:14
#103 Simon Jakob (simon.jakob) 100 (18714) 2016-11-19 22:55:46
#104 Michael (FoM) 100 (34465) 2016-12-19 00:45:24
#105 Rene (ion) 100 (5617) 2017-02-04 23:53:05
#106 crypto (crypto31082000) 100 (300) 2017-02-12 09:58:56
#107 Andromeda (Andromeda) 100 (1604) 2017-02-12 10:30:49
#108 Mihail (plexor) 100 (16827) 2017-02-26 07:41:26
#109 Mir Dim (mir0soft) 100 (72404) 2017-03-17 20:46:04
#110 Martin S (snowy) 100 (900) 2017-03-24 15:13:02
#111 chris (c2) 100 (51973) 2017-03-24 23:00:21
#112 Daniel Walder (ibex) 100 (14372) 2017-03-28 16:29:53
#113 sarah b (silva) 100 (14059) 2017-04-01 14:27:05
#114 Gerson (glumi) 100 (500) 2017-04-03 17:16:06
#115 Luciano Ignaczak (CryptoClass2017) 100 (3798) 2017-04-11 06:33:01
#116 Julian (Lemmynator) 100 (16666) 2017-04-21 19:33:01
#117 D3d4lu5 (D3d4lu5) 100 (260853) 2017-06-10 01:36:05
#118 Immo Weber (MandelToast) 100 (10061) 2017-08-13 17:20:08
#119 nimroth (nimroth cynthor) 100 (6021) 2017-11-23 20:28:02
#120 Lane Williams (planetlane) 100 (21611) 2018-01-15 00:47:37
#121 JoGo (JoGo) 100 (11686) 2018-03-01 16:28:56
#122 Lara Riegelhofer (larrow_sparrow) 100 (2798) 2018-04-05 19:08:02
#123 Fedilia (Fedilia) 100 (4489) 2018-06-09 19:29:34
#124 Random Dude (rnd) 100 (77973) 2018-07-06 19:47:37
#125 Steve Vaillancourt (stvai2) 100 (15041) 2018-07-27 19:28:15
#126 HowarthStudios (HowarthStudios) 100 (3496) 2018-09-12 20:47:51
#127 Pierre Robier (tripleedged) 100 (5916) 2018-11-24 23:22:00
#128 Clemens (16dombrowski) 100 (5136) 2018-12-16 00:50:45
#129 Alex (Meiny) 100 (5136) 2018-12-16 01:12:35
#130 zuben c3 (zuben-c3) 100 (24853) 2019-01-07 19:06:07
#131 Kevin Weber (ThunderArmy) 100 (7783) 2019-02-12 21:23:45
#132 LoneWolf219 (LoneWolf219) 100 (12795) 2019-03-10 19:55:27
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RSA Factoring Challenge: RSA-704

[rsa-02] - 36 users already solved this challenge, 7 are working on it.
 
 
 

This challenge descends from the RSA Laboratories contest to encourage research into the practical difficulty of factoring large integers of different length (between 330 and 2048 bit) and cracking RSA keys used in cryptography. This challenge is about factoring a number with 212 decimal digits.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2013-07-31 16:34
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#36) Achieved points (Global score) y-m-d - h:m:s

Armin Krauss (argh) 0 (175390) 2013-07-31 18:55:07
Viktor (Veselovský) 0 (142053) 2013-07-31 19:30:43
J. M. (jomandi) 0 (113270) 2013-08-01 00:19:22
Luigi Tomelli (archstanton) 0 (108345) 2013-08-01 09:37:51
#5 Ralf Stephan (rwst) 0 (25229) 2013-08-01 10:15:35
#6 masam (jimboo) 0 (18687) 2013-08-15 10:34:21
#7 Philipp Hammer-Pohlau (phase2) 0 (17981) 2013-08-15 11:16:21
#8 Andreas Wolff (timberwolff) 0 (1340) 2013-09-06 22:18:42
#9 Seth Kintigh (DarkFibre) 0 (79471) 2013-10-10 05:47:46
#10 fact (factoreal) 0 (400) 2013-11-22 19:15:24
#11 George (Theofanidis) 0 (101521) 2013-11-24 09:00:17
#12 Brad (braddrew) 0 (15878) 2013-12-08 11:57:04
#13 Ruempel, Eckart (DM4TNF) 0 (400) 2013-12-17 20:50:41
#14 Csaba Fitzl (csaby) 0 (6696) 2013-12-31 10:51:14
#15 Duy Khanh Dau (khanh45a3kct) 0 (5783) 2014-03-10 22:03:50
#16 Bart den Hartog (Bart13) 0 (118984) 2014-04-23 16:10:03
#17 Nils (NiKo) 0 (5055) 2014-04-24 09:47:40
#18 Michael (pheenyx) 0 (3840) 2014-05-23 23:46:32
#19 caesar ([caesar]) 0 (10738) 2014-06-02 18:36:20
#20 Thomas Gonda (TomG) 0 (36291) 2014-08-30 20:44:44
#21 Jeetsagar (jeetsagar) 0 (2429) 2014-10-03 20:29:28
#22 Bernhard Gruber (bgr) 0 (22889) 2014-10-14 19:18:34
#23 Javantea (Javantea) 0 (40816) 2014-11-01 20:47:47
#24 Francisco Moraes (fmoraes) 0 (90044) 2014-11-05 14:46:22
#25 Snake (snk) 0 (72164) 2014-11-10 18:06:53
#26 HolgerK (HolgerK) 0 (25776) 2015-04-23 10:58:31
#27 Rainer Zufall (kiekuk) 0 (56786) 2015-04-23 15:29:22
#28 S (Zyphe) 0 (10461) 2017-01-02 19:37:30
#29 Kasia (kasia-tutej) 0 (53366) 2017-06-16 20:56:02
#30 NGUYEN Ngoc Ky (kynguyenngoc) 0 (4974) 2017-06-18 09:52:02
#31 juw (juw) 0 (4179) 2017-08-10 21:46:50
#32 D3d4lu5 (D3d4lu5) 0 (260853) 2018-04-28 12:41:37
#33 Benjamin (200611736) 0 (10086) 2018-06-12 21:36:01
#34 Random Dude (rnd) 0 (77973) 2018-11-06 17:28:51
#35 mglarragan (mglarragan) 0 (2091) 2019-01-13 20:18:37
#36 Lia (Lia) 0 (6855) 2019-03-10 02:21:49
The solution for this challenge was made public on 2013-07-31, 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.
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ORYX Stream Cipher — Part 4d

[stamp-14] - 0 users already solved this challenge, 1 is working on it.
 
 
 

The ORYX stream cipher consists of three 32-bit LFSRs X, A, B which are shifted differently depending on some bits in the LFSR X. The key stream is a combination of the highest 8 bits of each of the three LFSRs. It is neither feasible nor necessary to search the whole 96-bit key space, there are more efficient methods!
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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.
Published on: 2013-06-27 11:38
Maximum number of attempts for this challenge: 15

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ORYX Stream Cipher — Part 3 (revised)

[stamp-13] - 28 users already solved this challenge, 1 is working on it.
 
 
 

The ORYX stream cipher consists of three 32-bit LFSRs X, A, B which are shifted differently depending on some bits in the LFSR X. The key stream is a combination of the highest 8 bits of each of the three LFSRs. It is neither feasible nor necessary to search the whole 96-bit key space, there are more efficient methods!
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.
Published on: 2013-06-06 20:39
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#28) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (142053) 2013-06-06 22:17:21
J. M. (jomandi) 2000 (113270) 2013-06-06 23:37:08
Kurt Gebauer (Yokozuna) 2000 (146278) 2013-06-07 03:14:23
George (Theofanidis) 2000 (101521) 2013-06-07 05:16:04
#5 Armin Krauss (argh) 2000 (175390) 2013-06-07 20:33:29
#6 Hans Peter (hanspeter) 1547 (52256) 2013-06-13 12:21:44
#7 Luigi Tomelli (archstanton) 1523 (108345) 2013-06-13 22:19:41
#8 Em Doulgerakis (Greko) 1349 (124033) 2013-07-03 09:44:44
#9 zahir mohsen moradi (ariobarzan) 1337 (99757) 2013-07-06 06:44:49
#10 Forrest Gump (Polyphem) 1196 (38763) 2013-11-25 21:40:40
#11 Francisco Moraes (fmoraes) 1194 (90044) 2013-12-01 06:21:38
#12 Alain (Integral) 1180 (207924) 2014-01-20 17:25:01
#13 Bart den Hartog (Bart13) 1163 (118984) 2014-04-22 23:36:42
#14 S Combes (jerva) 1137 (99132) 2015-01-25 09:27:26
#15 Claude Vaillancourt (Cl3v3r) 1134 (38351) 2015-03-06 17:02:44
#16 E.T (Ertheb) 1127 (71517) 2015-07-14 12:08:23
#17 Javantea (Javantea) 1125 (40816) 2015-08-28 20:04:24
#18 Martin Härterich (HaeM) 1124 (15149) 2015-10-06 14:59:08
#19 Alain Collignon (vexilla72) 1121 (80284) 2015-12-17 19:31:00
#20 Julia Bernotat (El Greco ) 1120 (81129) 2015-12-31 13:58:43
#21 Karl Schutt (günter) 1118 (41550) 2016-03-20 19:29:38
#22 Rider (alrider) 1113 (7214) 2016-09-05 00:06:31
#23 Nicolas (nicosPavlov) 1111 (151166) 2016-11-04 18:01:00
#24 Kasia (kasia-tutej) 1106 (53366) 2017-06-27 12:49:21
#25 D3d4lu5 (D3d4lu5) 1106 (260853) 2017-06-28 06:03:12
#26 George Lasry (george4096) 1106 (292103) 2017-06-28 15:20:52
#27 Michael (FoM) 1096 (34465) 2019-02-18 13:22:49
#28 Klaus (kumaus) 1096 (21415) 2019-04-16 10:28:33
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   +++    [21:51 - 24.04.2019] r_karoly solved the Level I challenge 'Original Caesar Cipher'    +++    [14:24 - 24.04.2019] maryllb solved the Level I challenge 'Number Sequence'    +++    [14:20 - 24.04.2019] lim0n solved the Level I challenge 'Factorization Cipher — Part 1'    +++    [14:17 - 24.04.2019] lim0n solved the Level I challenge 'Number Sequence — Part 8'    +++    [13:31 - 24.04.2019] Hopfrog solved the Level I challenge 'Number Sequence — Part 2'    +++