MysteryTwister C3
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Level II Challenges (160)

Page 13 of the challenges in Level II, ordered by date posted (the most recent appear first).

Advent Challenge — Part 4

[rotthaler-06] - 37 users already solved this challenge.
 
 
 

Decrypting a Christmas carol to help children in need? It's not that easy, if you don't know much about cryptography. Can you help Jacob and the children?
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Click here to get to the corresponding forum topic to share your opinion.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-12-21 17:06
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#37) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (169444) 2017-12-21 18:47:44
Michael Möller (michaelm) 2000 (256593) 2017-12-21 19:14:17
Kurt Gebauer (Yokozuna) 2000 (282608) 2017-12-21 19:56:48
Scombes (jerva) 2000 (266541) 2017-12-21 22:27:59
#5 H. Lautenschlager (helmi) 2000 (57600) 2017-12-21 23:30:50
#6 Dominik M. (Sgt. Pepper) 2000 (128575) 2017-12-22 01:43:42
#7 Alain Collignon (vexilla72) 2000 (123666) 2017-12-22 08:16:18
#8 D3d4lu5 (D3d4lu5) 1824 (363488) 2017-12-22 20:43:46
#9 Ronja (Ronja) 1824 (3715) 2017-12-22 22:59:42
#10 J-L Morel (Rossignol) 1824 (42130) 2017-12-23 09:15:19
#11 Mir Dim (mir0soft) 1824 (79760) 2017-12-23 11:56:52
#12 Armin Krauss (argh) 1725 (206965) 2017-12-23 23:50:55
#13 Rainer Zufall (kiekuk) 1547 (56786) 2017-12-28 14:16:36
#14 Snake (snk) 1502 (187783) 2017-12-29 21:06:52
#15 Nicolas (nicosPavlov) 1433 (257791) 2018-01-04 07:57:46
#16 E.T (Ertheb) 1423 (81809) 2018-01-04 18:37:28
#17 George (Theofanidis) 1302 (132517) 2018-01-31 18:24:56
#18 Nofre Tete (noffi) 1229 (26507) 2018-04-02 11:48:23
#19 Szabó Zoltán (szabo.z87) 1223 (55604) 2018-04-12 12:01:01
#20 Alain (Integral) 1192 (207924) 2018-06-24 18:18:23
#21 Eric (ExAstris) 1192 (56037) 2018-06-24 21:14:31
#22 Em Doulgerakis (Greko) 1181 (193799) 2018-08-02 16:48:27
#23 Hans Joachim Girulat (joregi) 1178 (36278) 2018-08-18 18:12:23
#24 Random Dude (rnd) 1168 (103645) 2018-10-06 04:22:09
#25 Luigi Tomelli (archstanton) 1158 (127538) 2018-12-18 14:22:13
#26 Kasia (kasia-tutej) 1156 (53366) 2019-01-01 23:18:27
#27 Lane Williams (planetlane) 1149 (34637) 2019-03-08 02:58:17
#28 Eugene (lim0n) 1145 (195334) 2019-04-21 12:39:25
#29 Bart den Hartog (Bart13) 1138 (149236) 2019-07-17 17:45:13
#30 Polaris (Polaris) 1118 (32963) 2020-09-29 23:10:52
#31 Derek Hatton (alfred_noble) 1117 (33998) 2020-10-27 12:56:32
#32 Flo (sealth) 1116 (25734) 2020-11-15 17:38:24
#33 zuben c3 (zuben-c3) 1116 (44417) 2020-11-20 11:00:17
#34 Nicky (Wokini) 1116 (18494) 2020-12-02 09:42:38
#35 Claude Vaillancourt (Cl3v3r) 1116 (44129) 2020-12-09 16:49:19
#36 madness (madness) 1113 (71592) 2021-02-26 03:22:17
#37 Silvia Kortmann (mikinsget) 1110 (24027) 2021-07-22 12:16:41
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AES ECB Wrong Encoding

[miro-01] - 21 users already solved this challenge.
 
 
 

Do you believe that AES is easy to break because of a wrong encoding? Try it yourself...
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: 2017-12-16 19:21
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#21) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (169444) 2017-12-17 18:10:22
Snake (snk) 1824 (187783) 2017-12-17 21:48:12
Armin Krauss (argh) 1824 (206965) 2017-12-17 23:34:09
Kurt Gebauer (Yokozuna) 1824 (282608) 2017-12-18 13:16:26
#5 Kasia (kasia-tutej) 1613 (53366) 2017-12-21 16:40:57
#6 D3d4lu5 (D3d4lu5) 1523 (363488) 2017-12-24 04:30:18
#7 Dominik M. (Sgt. Pepper) 1523 (128575) 2017-12-24 17:46:24
#8 H. Lautenschlager (helmi) 1423 (57600) 2017-12-31 18:15:33
#9 a (agigi) 1192 (1192) 2018-06-18 14:46:05
#10 Oprea Bogdan (bogdan.oprea) 1192 (1192) 2018-06-18 14:48:57
#11 Teodoru catalin Andrei (teodoru) 1192 (5698) 2018-06-20 15:55:25
#12 Alain (Integral) 1184 (207924) 2018-07-19 09:43:49
#13 Em Doulgerakis (Greko) 1180 (193799) 2018-08-03 11:01:50
#14 Eugene (lim0n) 1143 (195334) 2019-05-12 06:23:52
#15 Bart den Hartog (Bart13) 1130 (149236) 2019-11-20 13:25:33
#16 madness (madness) 1126 (71592) 2020-02-28 17:34:49
#17 Silvia Kortmann (mikinsget) 1120 (24027) 2020-07-26 01:55:57
#18 Claude Vaillancourt (Cl3v3r) 1112 (44129) 2021-04-14 18:27:26
#19 Luigi Tomelli (archstanton) 1111 (127538) 2021-05-20 17:54:45
#20 Eric (ExAstris) 1111 (56037) 2021-05-21 01:31:06
#21 DS (DS8279) 1109 (34191) 2021-08-17 21:58:26
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Advent-Challenge — Part 2

[rotthaler-04] - 45 users already solved this challenge, 2 are working on it.
 
 
 

Mike would like to belong to the cryptographers. Can you help him to find out their meeting point at the Christmas market?
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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: 2017-12-16 19:20
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#45) Achieved points (Global score) y-m-d - h:m:s

Kurt Gebauer (Yokozuna) 2000 (282608) 2017-12-17 00:20:59
Dominik M. (Sgt. Pepper) 2000 (128575) 2017-12-17 06:30:45
Alain Collignon (vexilla72) 2000 (123666) 2017-12-17 11:20:39
Viktor (Veselovský) 2000 (169444) 2017-12-17 12:30:11
#5 Snake (snk) 2000 (187783) 2017-12-17 13:08:04
#6 HolgerK (HolgerK) 1824 (25776) 2017-12-17 21:40:33
#7 Armin Krauss (argh) 1824 (206965) 2017-12-17 23:35:23
#8 H. Lautenschlager (helmi) 1824 (57600) 2017-12-18 16:07:50
#9 Em Doulgerakis (Greko) 1824 (193799) 2017-12-18 16:55:03
#10 Rainer Zufall (kiekuk) 1725 (56786) 2017-12-19 18:36:20
#11 Mir Dim (mir0soft) 1660 (79760) 2017-12-20 14:38:38
#12 J-L Morel (Rossignol) 1660 (42130) 2017-12-20 15:48:19
#13 Kasia (kasia-tutej) 1613 (53366) 2017-12-21 14:27:23
#14 Martin (martinbucher) 1613 (38365) 2017-12-21 16:34:55
#15 D3d4lu5 (D3d4lu5) 1576 (363488) 2017-12-22 14:54:56
#16 chris_3stones (3stones) 1469 (38845) 2017-12-26 20:14:01
#17 George (Theofanidis) 1469 (132517) 2017-12-26 20:17:25
#18 T (Wagner) 1433 (16988) 2017-12-30 08:51:23
#19 Nicolas (nicosPavlov) 1414 (257791) 2018-01-01 12:24:40
#20 E.T (Ertheb) 1406 (81809) 2018-01-02 18:16:51
#21 j.h. (haegarq) 1357 (15452) 2018-01-10 11:36:25
#22 Tristan1473 (Tristan1473) 1260 (20432) 2018-02-22 09:28:54
#23 Thomas Gonda (TomG) 1236 (36291) 2018-03-19 14:50:31
#24 Szabó Zoltán (szabo.z87) 1222 (55604) 2018-04-09 12:22:19
#25 Silvia Kortmann (mikinsget) 1203 (24027) 2018-05-17 01:25:36
#26 Hans Joachim Girulat (joregi) 1177 (36278) 2018-08-16 23:28:02
#27 Random Dude (rnd) 1168 (103645) 2018-10-04 15:41:41
#28 Hans Peter (hanspeter) 1162 (52356) 2018-11-08 18:57:23
#29 Luigi Tomelli (archstanton) 1157 (127538) 2018-12-17 18:06:55
#30 zuben c3 (zuben-c3) 1155 (44417) 2019-01-02 12:17:53
#31 Eugene (lim0n) 1144 (195334) 2019-04-20 21:06:17
#32 Bart den Hartog (Bart13) 1138 (149236) 2019-07-17 02:45:34
#33 David (dvd) 1128 (3813) 2020-01-05 22:00:38
#34 Lane Williams (planetlane) 1120 (34637) 2020-07-14 18:41:23
#35 Artur Puzio (cytadela8) 1118 (14801) 2020-09-21 11:03:52
#36 Polaris (Polaris) 1117 (32963) 2020-10-04 01:30:14
#37 Derek Hatton (alfred_noble) 1117 (33998) 2020-10-25 01:43:08
#38 Nicky (Wokini) 1116 (18494) 2020-11-11 09:31:15
#39 Flo (sealth) 1116 (25734) 2020-11-15 13:41:42
#40 Michael (FoM) 1116 (57794) 2020-12-06 00:28:43
#41 Claude Vaillancourt (Cl3v3r) 1115 (44129) 2020-12-22 19:24:09
#42 Jean-Francois (Muskrat) 1115 (19013) 2021-01-04 15:29:40
#43 Hank (hanky) 1114 (24373) 2021-02-03 15:20:05
#44 madness (madness) 1113 (71592) 2021-02-26 00:19:33
#45 Marco Cinelli (Snap) 1111 (37769) 2021-05-04 10:03:45
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Hilly — Part 2

[almardeny-02] - 1 user already solved this challenge, 1 is working on it.
 
 
 

Hilly is an improved version of Hill cipher. This challenge consists of the decryption of a ciphertext by means of a partly-known key.
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: 2017-10-17 17:12
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#1) Achieved points (Global score) y-m-d - h:m:s

Em Doulgerakis (Greko) 1156 (193799) 2018-10-29 21:19:05
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Weakened ElsieFour — Part 3

[rotthaler-02] - 4 users already solved this challenge.
 
 
 

The challenges for the weakened ElsieFour serve as an exercise and use an intentionally weakened version of LC4. ElsieFour combines ideas of modern RC4 stream cipher, historical Playfair cipher and plaintext-dependent keystreams. It can be computed manually. Part 3 is a partly-known-plaintext challenge which provides 2 messages that were encrypted with the same key.
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: 2017-10-03 06:39
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#4) Achieved points (Global score) y-m-d - h:m:s

Nicolas (nicosPavlov) 1226 (257791) 2018-01-18 01:49:20
Michael Möller (michaelm) 1186 (256593) 2018-04-24 07:26:39
D3d4lu5 (D3d4lu5) 1113 (363488) 2020-12-29 19:34:27
Eugene (lim0n) 1108 (195334) 2021-07-18 14:28:10
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   +++    [16:58 - 27.09.2021] Surtees solved the Level I challenge 'Number Sequence — Part 2'    +++    [14:53 - 27.09.2021] jenniferdecastro solved the Level I challenge 'A hidden word'    +++    [14:28 - 27.09.2021] Mercer solved the Level II challenge 'Cracking SHA1-Hashed Passwords'    +++    [09:52 - 26.09.2021] CRYbaby solved the Level I challenge 'How do you become a big cryptographer?'    +++    [17:29 - 25.09.2021] gemmath solved the Level I challenge 'Letter to the Templars — Part 1'    +++