MysteryTwister C3
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Level II Challenges (158)

Page 12 of the challenges in Level II, ordered by date posted (the most recent appear first).

Weakened ElsieFour — Part 1

[rotthaler-07] - 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 1 is a partly-known key challenge which provides the first 12 characters of the key.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2018-04-28 16:29
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

George (Theofanidis) 1200 (123216) 2018-10-06 20:53:41
Michael Möller (michaelm) 1176 (253196) 2019-01-02 09:55:59
D3d4lu5 (D3d4lu5) 1138 (363488) 2019-11-28 19:27:00
Eugene (lim0n) 1115 (178540) 2021-05-10 19:34:04
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The Einstein Enigma

[hiker-01] - 55 users already solved this challenge, 4 are working on it.
 
 
 

The hero of the book has to decode a manuscript — seven lines of it are here for you. These lines were encoded with a mixture of classic methods — anagrams, two position-dependent monoalphabetic substitutions and Atbash. Can you help him?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2018-02-07 23:40
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#55) Achieved points (Global score) y-m-d - h:m:s

H. Lautenschlager (helmi) 2000 (56470) 2018-02-08 18:35:02
Kurt Gebauer (Yokozuna) 2000 (282608) 2018-02-08 20:23:50
Snake (snk) 2000 (187783) 2018-02-08 21:10:28
Alain Collignon (vexilla72) 1824 (123666) 2018-02-09 07:29:58
#5 Mir Dim (mir0soft) 1824 (79760) 2018-02-09 09:40:24
#6 Dominik M. (Sgt. Pepper) 1824 (128575) 2018-02-09 12:33:10
#7 Mihail (plexor) 1725 (16827) 2018-02-10 13:44:32
#8 Lane Williams (planetlane) 1660 (34637) 2018-02-11 04:56:48
#9 E.T (Ertheb) 1660 (81809) 2018-02-11 17:34:28
#10 Armin Krauss (argh) 1613 (206965) 2018-02-12 00:55:11
#11 Nicolas (nicosPavlov) 1613 (257791) 2018-02-12 03:48:24
#12 chris_3stones (3stones) 1613 (38845) 2018-02-12 20:31:25
#13 George (Theofanidis) 1613 (123216) 2018-02-12 20:34:04
#14 Marc (rcll0891) 1576 (24004) 2018-02-12 23:54:59
#15 Sebastian Slupina (Grandwizard) 1547 (10866) 2018-02-14 23:36:16
#16 Viktor (Veselovský) 1523 (169444) 2018-02-15 18:12:30
#17 Manu (manu87) 1502 (2979) 2018-02-16 09:14:05
#18 Rainer Zufall (kiekuk) 1414 (56786) 2018-02-23 21:36:11
#19 j.h. (haegarq) 1373 (15352) 2018-03-01 08:45:39
#20 Jhoana Reichert (15faustino) 1324 (1724) 2018-03-13 01:16:54
#21 Nofre Tete (noffi) 1324 (26507) 2018-03-13 19:04:33
#22 Norbert Biermann (Norbert) 1305 (47790) 2018-03-20 11:27:40
#23 Ignacio (Moebiusar) 1302 (7390) 2018-03-21 13:59:00
#24 D3d4lu5 (D3d4lu5) 1278 (363488) 2018-04-03 12:25:30
#25 Szabó Zoltán (szabo.z87) 1264 (55604) 2018-04-13 13:36:52
#26 Allisat (psychohasii) 1248 (4356) 2018-04-28 00:36:38
#27 Anna (ronja11) 1236 (4244) 2018-05-11 14:24:08
#28 Eric (ExAstris) 1224 (54941) 2018-05-28 02:56:23
#29 Manfred Wurm (Tschabobo) 1216 (8935) 2018-06-11 09:22:40
#30 Alain (Integral) 1210 (207924) 2018-06-24 10:58:21
#31 Em Doulgerakis (Greko) 1197 (193799) 2018-07-27 14:56:52
#32 Hans Joachim Girulat (joregi) 1197 (36278) 2018-07-27 19:49:03
#33 Danny Higgins (hamster147) 1190 (39638) 2018-08-18 22:44:30
#34 Michael Möller (michaelm) 1186 (253196) 2018-09-02 09:58:19
#35 Random Dude (rnd) 1185 (103645) 2018-09-03 06:05:00
#36 sarah b (silva) 1168 (47847) 2018-11-28 11:38:47
#37 Karl Schutt (günter) 1167 (44374) 2018-11-30 22:19:10
#38 Luigi Tomelli (archstanton) 1164 (127538) 2018-12-19 16:17:47
#39 zuben c3 (zuben-c3) 1162 (27154) 2019-01-05 16:04:02
#40 Bertolo (Bertolo) 1160 (7167) 2019-01-15 18:34:32
#41 Clemens (16dombrowski) 1153 (5136) 2019-03-13 19:42:18
#42 Alex (Meiny) 1153 (5136) 2019-03-13 20:00:00
#43 Eugene (lim0n) 1144 (178540) 2019-06-22 15:29:12
#44 Bart den Hartog (Bart13) 1142 (148936) 2019-07-16 03:33:56
#45 Gerd Wilts (gerdw) 1142 (50534) 2019-07-16 07:43:05
#46 Alain Terieur (Alain) 1134 (6510) 2019-11-08 19:33:52
#47 Jasmin (Miles) 1134 (8987) 2019-11-09 01:28:15
#48 Derek Hatton (alfred_noble) 1130 (33998) 2020-01-28 22:46:49
#49 Thomas (Thomas4897) 1128 (36141) 2020-03-05 20:29:10
#50 Anabel Roschmann (Beltiona Mousa) 1127 (4919) 2020-03-24 02:55:19
#51 Polaris (Polaris) 1119 (32963) 2020-09-27 15:25:11
#52 Mike (RogueRamblers) 1118 (75961) 2020-11-11 18:32:54
#53 gordon (sir5) 1113 (16181) 2021-04-11 12:40:44
#54 Michael (FoM) 1113 (57794) 2021-04-18 13:39:59
#55 Silvia Kortmann (mikinsget) 1113 (20341) 2021-04-18 14:58:41
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Advent Challenge — Part 3

[rotthaler-05] - 38 users already solved this challenge, 2 are working on it.
 
 
 

What do you do, if your father and your stepmother decide to communicate only encrypted? You tape-record the messages. But what do the two of them really talk about?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2017-12-22 18:19
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#38) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (169444) 2017-12-22 19:30:50
Dominik M. (Sgt. Pepper) 2000 (128575) 2017-12-22 19:31:05
Alain Collignon (vexilla72) 2000 (123666) 2017-12-22 19:34:58
Kurt Gebauer (Yokozuna) 2000 (282608) 2017-12-22 19:43:48
#5 D3d4lu5 (D3d4lu5) 2000 (363488) 2017-12-22 19:44:19
#6 H. Lautenschlager (helmi) 2000 (56470) 2017-12-22 21:36:12
#7 Snake (snk) 2000 (187783) 2017-12-22 21:41:17
#8 Mir Dim (mir0soft) 2000 (79760) 2017-12-23 08:43:02
#9 S Combes (jerva) 2000 (242717) 2017-12-23 10:37:20
#10 Armin Krauss (argh) 1824 (206965) 2017-12-23 21:23:45
#11 Em Doulgerakis (Greko) 1824 (193799) 2017-12-24 12:12:44
#12 Rainer Zufall (kiekuk) 1576 (56786) 2017-12-28 16:21:44
#13 Ronja (Ronja) 1576 (3715) 2017-12-28 17:00:41
#14 E.T (Ertheb) 1456 (81809) 2018-01-03 17:42:31
#15 Nicolas (nicosPavlov) 1444 (257791) 2018-01-04 07:56:07
#16 Martin (martinbucher) 1423 (38365) 2018-01-06 11:17:17
#17 Manu (manu87) 1276 (2979) 2018-02-16 12:32:20
#18 Szabó Zoltán (szabo.z87) 1226 (55604) 2018-04-09 15:31:39
#19 Alain (Integral) 1192 (207924) 2018-06-24 23:40:15
#20 George (Theofanidis) 1190 (123216) 2018-07-02 22:33:10
#21 Random Dude (rnd) 1169 (103645) 2018-10-06 14:31:34
#22 Hans Peter (hanspeter) 1163 (52356) 2018-11-08 18:58:36
#23 Luigi Tomelli (archstanton) 1158 (127538) 2018-12-18 09:34:04
#24 Kasia (kasia-tutej) 1156 (53366) 2019-01-01 23:38:24
#25 zuben c3 (zuben-c3) 1156 (27154) 2019-01-03 20:45:49
#26 Eugene (lim0n) 1145 (178540) 2019-04-20 21:09:23
#27 Lane Williams (planetlane) 1144 (34637) 2019-05-04 03:53:34
#28 Bart den Hartog (Bart13) 1138 (148936) 2019-07-17 03:37:43
#29 Artur Puzio (cytadela8) 1118 (14801) 2020-09-21 11:12:37
#30 Polaris (Polaris) 1118 (32963) 2020-09-28 01:12:19
#31 Derek Hatton (alfred_noble) 1117 (33998) 2020-10-25 13:45:27
#32 Nicky (Wokini) 1116 (18494) 2020-11-11 15:22:07
#33 Flo (sealth) 1116 (25734) 2020-11-15 14:11:55
#34 Claude Vaillancourt (Cl3v3r) 1116 (44129) 2020-12-08 03:48:12
#35 Silvia Kortmann (mikinsget) 1115 (20341) 2020-12-26 14:21:16
#36 madness (madness) 1113 (71592) 2021-02-26 03:03:36
#37 Marco Cinelli (Snap) 1112 (37769) 2021-05-04 17:57:01
#38 Eric (ExAstris) 1111 (54941) 2021-05-18 18:53:31
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Advent Challenge — Part 4

[rotthaler-06] - 36 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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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 (#36) Achieved points (Global score) y-m-d - h:m:s

Viktor (Veselovský) 2000 (169444) 2017-12-21 18:47:44
Michael Möller (michaelm) 2000 (253196) 2017-12-21 19:14:17
Kurt Gebauer (Yokozuna) 2000 (282608) 2017-12-21 19:56:48
S Combes (jerva) 2000 (242717) 2017-12-21 22:27:59
#5 H. Lautenschlager (helmi) 2000 (56470) 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 (123216) 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 (54941) 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 (178540) 2019-04-21 12:39:25
#29 Bart den Hartog (Bart13) 1138 (148936) 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 (27154) 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
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AES ECB Wrong Encoding

[miro-01] - 20 users already solved this challenge.
 
 
 

Do you believe that AES is easy to break because of a wrong encoding? Try it yourself...
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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 (#20) 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 (56470) 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 (178540) 2019-05-12 06:23:52
#15 Bart den Hartog (Bart13) 1130 (148936) 2019-11-20 13:25:33
#16 madness (madness) 1126 (71592) 2020-02-28 17:34:49
#17 Silvia Kortmann (mikinsget) 1120 (20341) 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 (54941) 2021-05-21 01:31:06
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   +++    [20:39 - 21.06.2021] mglarragan solved the Level I challenge 'Enigma Messages with Repeated Letters — Part 4'    +++    [20:28 - 21.06.2021] mglarragan solved the Level I challenge 'Enigma Messages with Repeated Letters — Part 2'    +++    [20:14 - 21.06.2021] mglarragan solved the Level I challenge 'Enigma Messages with Repeated Letters — Part 3'    +++    [01:44 - 21.06.2021] RogueRamblers solved the Level II challenge 'The T52 Sturgeon Challenge — Part 8'    +++    [01:26 - 21.06.2021] RogueRamblers solved the Level II challenge 'The T52 Sturgeon Challenge — Part 12'    +++