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.

How do you become a big cryptographer?

[veselovsky-16] - 181 users already solved this challenge, 87 are working on it.
 
 
 

You are invited to a job interview for the job of a cryptographer. Can you pass the first selection round?
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: 2012-05-28 17:07
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#181) Achieved points (Global score) y-m-d - h:m:s

Hans Peter (hanspeter) 200 (52256) 2012-05-28 20:05:04
Armin Krauss (argh) 200 (175390) 2012-05-28 20:05:53
J. M. (jomandi) 200 (113270) 2012-05-28 23:26:26
Kurt Gebauer (Yokozuna) 200 (146278) 2012-05-29 01:44:42
#5 Bart den Hartog (Bart13) 200 (118984) 2012-05-29 01:45:20
#6 H. Lautenschlager (helmi) 200 (29022) 2012-05-29 09:37:03
#7 Michael Möller (michaelm) 200 (169404) 2012-05-29 16:50:30
#8 Christof Kleber (Loki) 150 (6051) 2012-05-30 10:39:01
#9 William Gates (bgates87) 117 (419) 2012-06-02 23:33:51
#10 Dusan (xxdradus) 113 (40236) 2012-06-04 17:51:03
#11 Luigi Tomelli (archstanton) 110 (108345) 2012-06-06 20:36:15
#12 Daniel Richter (TheHiveMind) 107 (11147) 2012-06-12 13:57:34
#13 Michel Van Caneghem (vancan) 106 (49719) 2012-06-13 17:12:42
#14 jacobian1729 (jacobian1729) 105 (5584) 2012-06-18 01:05:27
#15 John Willemse (Melting Brains) 105 (1316) 2012-06-18 14:22:39
#16 Seth Kintigh (DarkFibre) 104 (79471) 2012-06-20 06:28:26
#17 krislig (krislig) 103 (303) 2012-06-27 11:26:53
#18 Peter Grosse-Hering (Peter) 103 (8097) 2012-07-01 10:58:04
#19 Christian (Etschupu) 102 (31788) 2012-07-09 16:57:02
#20 Greg Cortazzo (pyromaniac77) 102 (102) 2012-07-11 19:01:52
#21 Stepan (m1sterx) 102 (19165) 2012-07-23 17:42:00
#22 Answer (Answer) 102 (704) 2012-07-27 04:27:38
#23 Daniel Yam (VolcanicPanik) 102 (612) 2012-07-27 04:31:01
#24 Hank (hanky) 101 (22859) 2012-09-09 00:45:28
#25 Harry (Schwabenbambi) 101 (2409) 2012-09-22 13:49:37
#26 E.T (Ertheb) 101 (70256) 2012-09-24 13:22:40
#27 Benny (Kingombo) 101 (3663) 2012-09-25 02:39:08
#28 Martina (Nikita) 101 (3863) 2012-09-25 02:41:50
#29 Patrick Renz (tarantulla) 101 (2027) 2012-09-27 10:23:13
#30 Makc (max-violent) 101 (2583) 2012-10-11 10:07:08
#31 Deepak Raja N (deepakincredible) 101 (621) 2012-10-17 13:57:32
#32 Kevin Zabel (kzabel) 101 (604) 2012-10-24 23:58:00
#33 Frank (FWeissenb) 101 (101) 2012-10-26 21:17:28
#34 Christian (md6) 101 (1404) 2012-10-26 22:17:59
#35 Sam Kennedy (Sam Kennedy) 101 (2128) 2012-10-30 00:00:49
#36 rdnh (rdnh) 101 (101) 2012-10-31 13:03:25
#37 Lukas Juhrich (ljuhrich) 101 (5453) 2012-11-01 22:41:25
#38 Sebastian Slupina (Grandwizard) 101 (10264) 2012-11-04 18:58:06
#39 Eugene (ZhekaS) 101 (6037) 2012-11-07 04:32:38
#40 Nathan (Witten) 101 (25326) 2012-11-21 03:10:26
#41 George Ho (GeorgH) 101 (3095) 2012-11-25 03:03:33
#42 gromone (gromone) 101 (501) 2012-11-25 21:28:49
#43 KW (qwer*) 101 (13963) 2012-11-25 21:46:59
#44 Andreas W. (v23v) 101 (502) 2012-11-26 18:18:40
#45 Julia Werdelmann (jw) 100 (10407) 2012-12-30 11:01:57
#46 Iain Sharp (WoodenHedgehog) 100 (2196) 2013-01-22 15:43:28
#47 Scruffy (Scruffy) 100 (501) 2013-01-25 18:45:31
#48 George (Theofanidis) 100 (101521) 2013-02-25 20:35:37
#49 Frans (fransl) 100 (2233) 2013-02-26 15:22:07
#50 Em Doulgerakis (Greko) 100 (124033) 2013-03-09 12:50:58
#51 mk (bilbobeutlin) 100 (12340) 2013-03-23 17:18:30
#52 Mayuresh Anand (effort2break) 100 (8728) 2013-03-23 22:07:53
#53 Kirill (ineaugh) 100 (1920) 2013-03-24 00:29:50
#54 Hans Joachim Girulat (joregi) 100 (33493) 2013-03-24 01:15:24
#55 RPH (derichard) 100 (27044) 2013-04-01 20:22:59
#56 Muendo (muendo) 100 (3501) 2013-04-07 12:16:56
#57 swarmspider (swarmspider) 100 (4528) 2013-04-26 14:50:15
#58 Bernhard Gruber (bgr) 100 (22889) 2013-04-30 09:49:08
#59 Steve (aimaz) 100 (2027) 2013-05-09 20:59:59
#60 Snake (snk) 100 (72164) 2013-05-19 17:43:23
#61 Felix (Flix) 100 (13712) 2013-05-22 19:33:18
#62 Jay Kay (Merty) 100 (3726) 2013-06-18 15:01:11
#63 Steve (Samacian) 100 (23804) 2013-06-27 02:04:18
#64 Gergely Simon (george314) 100 (16555) 2013-06-28 14:30:52
#65 Laura (Weltenwandlerin) 100 (1004) 2013-06-28 23:06:52
#66 Ralf Stephan (rwst) 100 (22735) 2013-07-27 11:36:49
#67 Forrest Gump (Polyphem) 100 (38763) 2013-07-29 21:11:15
#68 Philipp Hammer-Pohlau (phase2) 100 (17981) 2013-08-15 13:33:38
#69 Stefan Schenk (schenkst) 100 (300) 2013-08-17 02:10:25
#70 Thomas Gonda (TomG) 100 (36291) 2013-09-09 17:00:45
#71 Heiko Kirsch (DENISOVA) 100 (1758) 2013-09-29 19:31:38
#72 Andrew (Agromania) 100 (4508) 2013-11-04 02:52:52
#73 George Lasry (george4096) 100 (292103) 2013-12-04 00:07:26
#74 Brad (braddrew) 100 (15878) 2013-12-15 23:30:21
#75 Alain (Integral) 100 (207924) 2013-12-19 13:39:09
#76 Jim Gillogly (Scryer) 100 (21260) 2013-12-21 03:29:53
#77 Csaba Fitzl (csaby) 100 (6696) 2014-01-02 21:54:48
#78 Pavel (haw) 100 (22728) 2014-01-06 13:58:46
#79 Waylon (waylon531) 100 (3265) 2014-01-12 05:14:46
#80 Flo (sealth) 100 (13472) 2014-01-21 21:10:16
#81 j.h. (haegarq) 100 (15252) 2014-02-05 11:21:51
#82 Marco (mawo25) 100 (2445) 2014-02-08 09:35:30
#83 Josef Gillhuber (jogimi51) 100 (2446) 2014-02-08 09:56:44
#84 Marcel (bene1512) 100 (20896) 2014-02-08 14:28:37
#85 Kim H. S. (tenchijin) 100 (25468) 2014-03-05 11:17:06
#86 Sascha (The Hoddich) 100 (4350) 2014-03-06 15:08:41
#87 mark (FivePrime) 100 (3345) 2014-03-10 13:08:55
#88 Karl Schutt (günter) 100 (41550) 2014-04-06 15:27:13
#89 Simone (Momo) 100 (5478) 2014-04-10 18:25:42
#90 joe (herbert) 100 (800) 2014-04-18 17:43:53
#91 Nik (LastObserver) 100 (3552) 2014-05-07 19:34:10
#92 Julia Bernotat (El Greco ) 100 (81129) 2014-07-16 15:57:38
#93 Hughes (hughes) 100 (4735) 2014-07-24 13:00:33
#94 julius gaius (julius) 100 (25581) 2014-07-27 19:57:24
#95 Robert (rm) 100 (56475) 2014-07-31 22:29:02
#96 Petra (humppapenguin) 100 (3872) 2014-09-22 19:38:36
#97 Bertold (bk) 100 (9673) 2014-10-13 22:22:46
#98 Francisco Moraes (fmoraes) 100 (90044) 2014-11-08 13:46:21
#99 Tim Fink (Magellan) 100 (4876) 2014-11-29 12:30:59
#100 Felix Huhndorf (illusion) 100 (403) 2014-12-18 20:46:00
#101 Kai Ludwig (TalentRaspel) 100 (15704) 2015-01-06 15:21:40
#102 HolgerK (HolgerK) 100 (25776) 2015-01-09 01:42:40
#103 Claude Vaillancourt (Cl3v3r) 100 (38351) 2015-01-18 20:45:35
#104 Danny Higgins (hamster147) 100 (21817) 2015-01-20 00:03:31
#105 T (Wagner) 100 (16887) 2015-02-09 21:39:41
#106 Michael Jeffrey (empjay) 100 (3004) 2015-02-23 22:47:03
#107 Marta (argo916) 100 (501) 2015-03-01 22:23:35
#108 Rainer Zufall (kiekuk) 100 (56786) 2015-03-01 23:08:49
#109 Konstantin Golovan (SoulShaker) 100 (14091) 2015-03-07 19:52:22
#110 curmudgeon (curmudgeon) 100 (711) 2015-03-08 04:53:03
#111 S Combes (jerva) 100 (99132) 2015-03-08 09:06:08
#112 Andreas Frerichs (Ossili) 100 (33266) 2015-03-13 18:01:23
#113 Brian Kieslich (briank) 100 (6733) 2015-04-15 10:14:36
#114 Lane Williams (planetlane) 100 (20524) 2015-04-24 02:46:19
#115 Michael Ammon (Ammonym) 100 (7719) 2015-06-05 23:30:19
#116 Defekt75 (Defekt75) 100 (4325) 2015-06-22 13:22:37
#117 Mark van Heeswijk (markvh) 100 (2600) 2015-07-11 00:56:01
#118 Erik (Erox) 100 (22651) 2015-07-17 22:40:13
#119 Tradecraft (Tradecraft) 100 (5540) 2015-08-03 00:14:22
#120 Sirius (Leznar) 100 (4552) 2015-09-13 10:20:07
#121 Joerg G. (SnifferMaster) 100 (17853) 2015-09-14 08:33:39
#122 Dominick (Zokio) 100 (1100) 2015-10-01 08:39:08
#123 partamier (yann) 100 (5435) 2015-10-08 15:23:33
#124 S (Zyphe) 100 (10461) 2015-10-31 18:44:12
#125 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-09 10:39:51
#126 Dominik M. (Sgt. Pepper) 100 (87927) 2015-12-21 14:44:05
#127 Jeremy Juenger (The_Shocker_12) 100 (3720) 2015-12-26 09:24:31
#128 Alain Collignon (vexilla72) 100 (80184) 2016-02-05 19:26:14
#129 Marco Manfredi (mkk9901) 100 (17686) 2016-03-01 17:01:29
#130 Fabian (XP-72) 100 (3707) 2016-03-16 13:40:20
#131 Peter (Garnet) 100 (14234) 2016-03-23 12:30:16
#132 zahir mohsen moradi (ariobarzan) 100 (99757) 2016-05-23 11:19:38
#133 Ho Chung Siu (soarerz) 100 (5314) 2016-06-28 09:52:35
#134 Peng Hui How (castlepeak) 100 (100) 2016-06-28 10:16:44
#135 Norbert Biermann (Norbert) 100 (44430) 2016-07-11 08:24:08
#136 Rene (Renederberserker) 100 (800) 2016-08-02 13:34:49
#137 Robert Kosten (Robert Kosten) 100 (2724) 2016-09-09 12:55:31
#138 Daniel Walder (ibex) 100 (14372) 2016-10-05 22:49:02
#139 Hajoe (Tintin-Muc) 100 (6923) 2016-10-30 22:38:23
#140 Mirko Rendey (Biork) 100 (6295) 2016-11-22 12:57:24
#141 Simon Jakob (simon.jakob) 100 (18714) 2016-11-29 09:08:07
#142 zuben c3 (zuben-c3) 100 (24853) 2016-11-30 21:40:14
#143 JoGo (JoGo) 100 (11686) 2016-12-04 09:27:54
#144 Michael (FoM) 100 (34465) 2016-12-05 02:05:24
#145 Imam Uasa (Merricx) 100 (9188) 2016-12-05 20:13:16
#146 Meine Registrierung (TryC3) 100 (6045) 2016-12-27 18:02:48
#147 Nofre Tete (noffi) 100 (21921) 2016-12-29 23:04:53
#148 Mihail (plexor) 100 (16827) 2017-02-28 11:57:56
#149 Mir Dim (mir0soft) 100 (72404) 2017-03-13 18:33:02
#150 Daniel Fretwell (fretty) 100 (30107) 2017-03-14 20:06:17
#151 sarah b (silva) 100 (12778) 2017-03-23 08:59:09
#152 chris (c2) 100 (51973) 2017-03-25 08:02:53
#153 Kasia (kasia-tutej) 100 (53366) 2017-05-29 15:03:50
#154 D3d4lu5 (D3d4lu5) 100 (260853) 2017-06-11 22:45:15
#155 Moomin (Mushmom) 100 (7674) 2017-07-20 15:57:46
#156 Akonia (Akonia12) 100 (12153) 2017-07-29 14:24:17
#157 Nicolas (nicosPavlov) 100 (151166) 2017-08-12 03:27:45
#158 Immo Weber (MandelToast) 100 (10061) 2017-08-13 14:30:54
#159 Godfrey Norton (Godfrey) 100 (8162) 2017-08-21 13:12:06
#160 Martina (BonoV) 100 (3017) 2017-11-06 14:04:23
#161 Tormod (tryeng) 100 (3397) 2017-12-14 02:43:00
#162 andy (drandika) 100 (500) 2018-01-17 18:18:52
#163 Ines (bufo01) 100 (4515) 2018-01-21 11:15:38
#164 nimroth (nimroth cynthor) 100 (6021) 2018-03-21 15:28:04
#165 Benjamin (200611736) 100 (7776) 2018-04-01 19:51:07
#166 Guilherme (Fachini) 100 (200) 2018-04-08 04:06:54
#167 Luciano Ignaczak (ignaczak) 100 (3390) 2018-04-14 16:08:21
#168 Steve Vaillancourt (stvai2) 100 (15041) 2018-04-27 16:36:57
#169 Fedilia (Fedilia) 100 (4489) 2018-06-09 19:02:17
#170 Random Dude (rnd) 100 (75797) 2018-06-24 20:12:48
#171 Julian (Lemmynator) 100 (16666) 2018-07-25 16:52:16
#172 HowarthStudios (HowarthStudios) 100 (3496) 2018-09-12 01:18:12
#173 clyto (clytorock) 100 (3195) 2018-11-04 20:18:48
#174 Bertolo (Bertolo) 100 (7167) 2019-01-06 21:09:41
#175 Marc (rcll0891) 100 (22180) 2019-01-21 20:05:01
#176 Pierre Robier (tripleedged) 100 (5916) 2019-02-18 12:31:46
#177 madness (madness) 100 (7976) 2019-02-21 01:21:29
#178 LoneWolf219 (LoneWolf219) 100 (12795) 2019-02-23 14:59:55
#179 Klaus Pulverer (kumaus) 100 (1001) 2019-03-08 16:53:52
#180 Lia (Lia) 100 (6855) 2019-03-12 17:24:26
#181 Mike (RogueRamblers) 100 (8042) 2019-03-14 21:38:17
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Keyshanc — Part 2

[reed-02] - 32 users already solved this challenge.
 
 
 

In this challenge a plaintext has been encrypted using the KeyshancRT version of Keyshanc. The plaintext is an excerpt from one of William Shakespeare's plays.
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: 2012-05-21 20:50
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#32) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (142053) 2012-05-21 23:15:04
Armin Krauss (argh) 2000 (175390) 2012-05-21 23:46:55
Seth Kintigh (DarkFibre) 2000 (79471) 2012-05-22 00:25:15
J. M. (jomandi) 2000 (113270) 2012-05-22 00:37:56
#5 Kurt Gebauer (Yokozuna) 2000 (146278) 2012-05-22 19:38:49
#6 Hans Peter (hanspeter) 1824 (52256) 2012-05-22 22:20:06
#7 Bart den Hartog (Bart13) 1725 (118984) 2012-05-24 11:54:15
#8 Michel Van Caneghem (vancan) 1725 (49719) 2012-05-24 16:19:23
#9 Daniel Richter (TheHiveMind) 1414 (11147) 2012-06-06 13:55:59
#10 Luigi Tomelli (archstanton) 1414 (108345) 2012-06-06 20:46:37
#11 Dusan (xxdradus) 1373 (40236) 2012-06-12 14:30:45
#12 Thomas Lambert (lambert) 1270 (35237) 2012-07-20 19:59:44
#13 Peter Mustermann (Gummiboot) 1239 (60285) 2012-08-18 18:38:37
#14 Almut (problelmo) 1149 (45992) 2013-08-03 00:33:15
#15 Snake (snk) 1149 (72164) 2013-08-08 23:10:05
#16 E.T (Ertheb) 1149 (70256) 2013-08-09 23:42:13
#17 zahir mohsen moradi (ariobarzan) 1148 (99757) 2013-08-13 18:46:20
#18 Alain (Integral) 1137 (207924) 2014-01-01 16:43:40
#19 George (Theofanidis) 1136 (101521) 2014-01-19 14:12:17
#20 Em Doulgerakis (Greko) 1133 (124033) 2014-03-06 12:05:52
#21 Kim H. S. (tenchijin) 1133 (25468) 2014-03-11 10:11:41
#22 Julia Bernotat (El Greco ) 1124 (81129) 2014-09-08 13:23:45
#23 Francisco Moraes (fmoraes) 1121 (90044) 2014-11-28 17:11:56
#24 Claude Vaillancourt (Cl3v3r) 1111 (38351) 2015-10-09 22:45:19
#25 Forrest Gump (Polyphem) 1109 (38763) 2016-01-12 16:58:49
#26 Alain Collignon (vexilla72) 1108 (80184) 2016-03-04 17:46:08
#27 Robert (rm) 1107 (56475) 2016-04-23 17:36:15
#28 Nicolas (nicosPavlov) 1103 (151166) 2016-11-23 10:34:42
#29 chris (c2) 1101 (51973) 2017-04-03 21:24:41
#30 D3d4lu5 (D3d4lu5) 1099 (260853) 2017-07-29 07:28:24
#31 George Lasry (george4096) 1099 (292103) 2017-08-06 20:46:36
#32 Dominik M. (Sgt. Pepper) 1098 (87927) 2017-11-02 23:07:30
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Keyshanc — Part 1

[reed-01] - 41 users already solved this challenge, 1 is working on it.
 
 
 

In this challenge an excerpt from a novel has been encrypted using the "Keyshanc" cipher. Keyshanc is a special kind of monoalphabetic substitution using a 95-character alphabet.
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: 2012-05-21 20:46
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#41) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (142053) 2012-05-21 22:46:39
J. M. (jomandi) 2000 (113270) 2012-05-21 23:06:46
Armin Krauss (argh) 2000 (175390) 2012-05-21 23:10:43
Seth Kintigh (DarkFibre) 2000 (79471) 2012-05-22 00:08:46
#5 The Killer (Killer) 2000 (42393) 2012-05-22 14:14:23
#6 Kurt Gebauer (Yokozuna) 2000 (146278) 2012-05-22 14:27:50
#7 Hans Peter (hanspeter) 1824 (52256) 2012-05-22 21:14:24
#8 Michel Van Caneghem (vancan) 1725 (49719) 2012-05-23 21:26:24
#9 Bart den Hartog (Bart13) 1725 (118984) 2012-05-24 11:12:26
#10 Luigi Tomelli (archstanton) 1485 (108345) 2012-05-31 13:36:31
#11 Daniel Richter (TheHiveMind) 1414 (11147) 2012-06-06 13:31:23
#12 Dusan (xxdradus) 1378 (40236) 2012-06-11 15:25:48
#13 Thomas Lambert (lambert) 1278 (35237) 2012-07-14 21:34:21
#14 Peter Mustermann (Gummiboot) 1266 (60285) 2012-07-23 18:41:31
#15 George (Theofanidis) 1259 (101521) 2012-07-29 16:49:18
#16 Em Doulgerakis (Greko) 1256 (124033) 2012-07-31 19:41:53
#17 chris_3stones (3stones) 1240 (37759) 2012-08-17 07:49:21
#18 tamisrah (tamisrah) 1238 (3134) 2012-08-19 20:45:31
#19 RPH (derichard) 1217 (27044) 2012-09-20 00:17:59
#20 Stepan (m1sterx) 1207 (19165) 2012-10-11 15:02:54
#21 Andrew (Agromania) 1193 (4508) 2012-11-17 04:40:57
#22 zahir mohsen moradi (ariobarzan) 1152 (99757) 2013-07-08 07:56:43
#23 Almut (problelmo) 1149 (45992) 2013-08-02 23:32:10
#24 Snake (snk) 1149 (72164) 2013-08-07 19:30:05
#25 E.T (Ertheb) 1149 (70256) 2013-08-07 23:46:45
#26 Thomas Gonda (TomG) 1146 (36291) 2013-09-11 17:44:52
#27 Alain (Integral) 1137 (207924) 2013-12-31 11:03:28
#28 Kim H. S. (tenchijin) 1135 (25468) 2014-01-30 21:45:56
#29 Julia Bernotat (El Greco ) 1124 (81129) 2014-09-05 13:05:15
#30 Francisco Moraes (fmoraes) 1122 (90044) 2014-11-10 20:30:43
#31 Robert (rm) 1113 (56475) 2015-08-02 18:55:44
#32 Claude Vaillancourt (Cl3v3r) 1111 (38351) 2015-10-09 16:31:40
#33 Forrest Gump (Polyphem) 1109 (38763) 2016-01-09 01:19:07
#34 Alain Collignon (vexilla72) 1108 (80184) 2016-03-03 10:40:44
#35 Adil (1UP) 1104 (1104) 2016-09-20 11:42:42
#36 Nicolas (nicosPavlov) 1103 (151166) 2016-11-04 14:09:08
#37 chris (c2) 1101 (51973) 2017-04-03 20:07:01
#38 D3d4lu5 (D3d4lu5) 1099 (260853) 2017-07-29 07:27:10
#39 George Lasry (george4096) 1099 (292103) 2017-08-06 19:44:57
#40 Dominik M. (Sgt. Pepper) 1098 (87927) 2017-11-02 19:49:11
#41 Random Dude (rnd) 1094 (75797) 2018-09-01 19:26:02
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Concealed Messages — Vigenère's Night Sky

[schmeh-08] - 16 users already solved this challenge.
 
 
 

In 1586 the famous French mathematician Blaise de Vigenère published a picture of the night sky and claimed that a message was concealed in it. Can you find out how to decipher this message?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2012-05-01 10:31
Maximum number of attempts for this challenge: 0

All successful users of this challenge

Rank User (#16) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (142053) 2012-05-04 03:23:00
Armin Krauss (argh) 1807 (175390) 2012-05-05 18:20:00
J. M. (jomandi) 1613 (113270) 2012-05-13 13:00:00
E.T (Ertheb) 1199 (70256) 2012-10-12 22:20:00
#5 Bart den Hartog (Bart13) 1179 (118984) 2012-12-21 01:17:00
#6 Alain (Integral) 1132 (207924) 2014-03-05 08:52:42
#7 Michael Doucha (mdou) 1131 (13757) 2014-03-26 14:22:00
#8 Kurt Gebauer (Yokozuna) 1118 (146278) 2015-02-08 23:55:15
#9 Julia Bernotat (El Greco ) 1118 (81129) 2015-02-14 11:07:00
#10 HolgerK (HolgerK) 1117 (25776) 2015-02-17 12:22:01
#11 Joerg G. (SnifferMaster) 1110 (17853) 2015-11-15 11:52:00
#12 Szabó Zoltán (szabo.z87) 1109 (55604) 2015-12-29 10:00:51
#13 KW (qwer*) 1109 (13963) 2016-01-03 20:40:00
#14 Norbert Biermann (Norbert) 1105 (44430) 2016-07-15 12:39:00
#15 j.h. (haegarq) 0 (15252) 2017-07-26 16:56:19
The solution for this challenge was made public on 2016-07-15, and thus it is not possible to get points for this challenge any more. However, you can still solve and enter a solution for this challenge. If you believe you have the solution, you can still write us an email.
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Number Sequence — Part 5

[edissmith-03] - 64 users already solved this challenge, 112 are working on it.
 
 
 

How are the numbers linked? Can you find the three missing numbers?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2012-04-18 19:27
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#64) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 114 (142053) 2012-04-24 19:50:59
Armin Krauss (argh) 114 (175390) 2012-04-24 20:13:34
J. M. (jomandi) 114 (113270) 2012-04-24 20:44:02
Bart den Hartog (Bart13) 114 (118984) 2012-04-24 22:52:44
#5 Aliazer (Aliazer) 114 (12314) 2012-04-25 01:36:22
#6 captp (bdcht) 109 (5864) 2012-04-29 11:26:17
#7 Daniel Richter (TheHiveMind) 102 (11147) 2012-06-12 16:26:33
#8 Steven Bi (chenhsi) 102 (1305) 2012-06-14 19:46:29
#9 Seth Kintigh (DarkFibre) 101 (79471) 2012-07-03 00:22:34
#10 Em Doulgerakis (Greko) 101 (124033) 2012-07-03 23:16:43
#11 Luigi Tomelli (archstanton) 101 (108345) 2012-07-17 13:45:19
#12 Stepan (m1sterx) 101 (19165) 2012-07-23 12:14:59
#13 E.T (Ertheb) 101 (70256) 2012-09-01 12:32:59
#14 Sam Kennedy (Sam Kennedy) 101 (2128) 2012-10-30 00:35:25
#15 Eugene (ZhekaS) 100 (6037) 2012-11-07 04:51:19
#16 Andrew (Agromania) 100 (4508) 2012-11-15 08:09:14
#17 Nathan (Witten) 100 (25326) 2012-11-21 19:11:15
#18 George (Theofanidis) 100 (101521) 2013-01-10 08:01:14
#19 Petra (humppapenguin) 100 (3872) 2013-03-28 01:30:05
#20 Oliver Schneider (cenn81) 100 (1100) 2013-04-23 20:10:39
#21 Bernhard Gruber (bgr) 100 (22889) 2013-05-07 10:29:54
#22 KW (qwer*) 100 (13963) 2013-06-01 20:32:10
#23 Steve (Samacian) 100 (23804) 2013-06-07 00:35:36
#24 Sebastian Slupina (Grandwizard) 100 (10264) 2013-10-26 17:49:00
#25 Hannes Nötzli (Faust) 100 (4781) 2013-11-06 10:32:52
#26 Boris (Kaasu) 100 (16566) 2013-11-14 21:07:20
#27 Francisco Moraes (fmoraes) 100 (90044) 2013-11-21 03:38:46
#28 Csaba Fitzl (csaby) 100 (6696) 2013-12-29 22:59:30
#29 Tawfeeq (Tbarqawi) 100 (700) 2014-01-09 03:37:33
#30 Markus Simon (Chara) 100 (804) 2014-06-10 03:05:29
#31 Flo (sealth) 100 (13472) 2014-06-22 16:43:53
#32 julius gaius (julius) 100 (25581) 2014-08-29 10:57:05
#33 Thomas Gonda (TomG) 100 (36291) 2014-09-03 22:15:14
#34 Robert (rm) 100 (56475) 2014-09-25 14:37:40
#35 HolgerK (HolgerK) 100 (25776) 2014-11-24 21:30:22
#36 Roger Crews (rogerbrandon) 100 (3588) 2015-01-17 10:16:32
#37 Tom Tox (tox) 100 (17708) 2015-02-15 11:59:32
#38 Rainer Zufall (kiekuk) 100 (56786) 2015-02-26 15:10:31
#39 Andreas Frerichs (Ossili) 100 (33266) 2015-04-03 17:52:23
#40 Erik (Erox) 100 (22651) 2015-07-15 15:53:16
#41 Joerg G. (SnifferMaster) 100 (17853) 2015-09-07 17:55:10
#42 Szabó Zoltán (szabo.z87) 100 (55604) 2015-11-27 11:57:47
#43 Spaceman (C. Nucleus) 100 (1401) 2016-02-11 10:50:55
#44 Nofre Tete (noffi) 100 (21921) 2016-02-16 18:39:25
#45 Rider (alrider) 100 (7214) 2016-03-02 15:58:32
#46 Alain (Integral) 100 (207924) 2016-03-13 15:00:42
#47 Steffen (stmue) 100 (2911) 2016-04-15 08:44:35
#48 Fabian (XP-72) 100 (3707) 2016-07-20 20:39:18
#49 Daniel Walder (ibex) 100 (14372) 2016-09-29 16:32:13
#50 Timo-Sven Johannisson (tsjcrypto) 100 (100) 2016-10-24 10:42:15
#51 Norbert Biermann (Norbert) 100 (44430) 2016-12-16 17:46:12
#52 zuben c3 (zuben-c3) 100 (24853) 2017-01-24 11:00:51
#53 Dominik M. (Sgt. Pepper) 100 (87927) 2017-03-15 12:43:25
#54 S (Zyphe) 100 (10461) 2017-03-15 13:36:36
#55 Mir Dim (mir0soft) 100 (72404) 2017-05-19 12:33:42
#56 Paul (Composaurus) 100 (900) 2017-09-07 21:48:29
#57 D3d4lu5 (D3d4lu5) 100 (260853) 2018-01-04 18:04:39
#58 Steve Vaillancourt (stvai2) 100 (15041) 2018-06-28 20:45:05
#59 Random Dude (rnd) 100 (75797) 2018-07-01 20:21:50
#60 Karl Schutt (günter) 100 (41550) 2018-08-05 19:00:08
#61 Lane Williams (planetlane) 100 (20524) 2018-08-09 20:15:33
#62 Snake (snk) 100 (72164) 2018-08-29 12:50:53
#63 simone (xseris) 100 (8432) 2018-10-20 13:12:13
#64 Michael (FoM) 100 (34465) 2018-12-06 09:43:55
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   +++    [00:10 - 20.03.2019] gduncan solved the Level I challenge 'Caesar Encryption'    +++    [21:06 - 19.03.2019] gduncan solved the Level I challenge 'Number Sequence — Part 2'    +++    [21:00 - 19.03.2019] gduncan solved the Level I challenge 'Original Caesar Cipher'    +++    [20:30 - 19.03.2019] gduncan solved the Level I challenge 'Number Sequence'    +++    [19:35 - 19.03.2019] hanspeteryoo solved the Level I challenge 'Number Sequence — Part 2'    +++