MysteryTwister C3
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Level II Challenges (160)

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

Summer Job

[minihold-02] - 47 users already solved this challenge, 2 are working on it.
 
 
 

During your summer job in an Austrian weekly magazine a mysterious letter arrives. Are you able to decrypt the message?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2018-06-12 13:16
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#47) Achieved points (Global score) y-m-d - h:m:s

Kurt Gebauer (Yokozuna) 2000 (282608) 2018-06-12 21:37:26
E.T (Ertheb) 2000 (81809) 2018-06-12 21:48:19
Viktor (Veselovský) 2000 (169444) 2018-06-12 23:34:15
D3d4lu5 (D3d4lu5) 2000 (363488) 2018-06-13 06:19:26
#5 Alain Collignon (vexilla72) 1824 (123666) 2018-06-13 15:53:42
#6 Dominik M. (Sgt. Pepper) 1725 (128575) 2018-06-14 22:17:14
#7 George (Theofanidis) 1613 (132517) 2018-06-17 11:54:19
#8 John Smith (Froyo10) 1547 (1747) 2018-06-18 20:24:50
#9 Teodoru catalin Andrei (teodoru) 1502 (5698) 2018-06-20 15:57:16
#10 Eric (ExAstris) 1485 (56037) 2018-06-22 04:38:27
#11 Alain (Integral) 1469 (207924) 2018-06-23 10:16:28
#12 Silvia Kortmann (mikinsget) 1433 (24027) 2018-06-26 01:36:50
#13 Armin Krauss (argh) 1406 (206965) 2018-06-28 20:33:36
#14 George Lasry (george4096) 1367 (422251) 2018-07-04 22:04:09
#15 Snake (snk) 1330 (187783) 2018-07-13 21:05:10
#16 Nicolas (nicosPavlov) 1327 (257791) 2018-07-15 05:49:19
#17 Mihail (plexor) 1324 (16827) 2018-07-16 09:04:57
#18 Em Doulgerakis (Greko) 1294 (193799) 2018-07-27 15:28:14
#19 Karl Schutt (günter) 1279 (44374) 2018-08-04 21:30:42
#20 Hans Joachim Girulat (joregi) 1278 (36278) 2018-08-05 17:41:25
#21 Andrei Gasparovici (fullofvim) 1261 (1861) 2018-08-18 07:52:36
#22 Random Dude (rnd) 1217 (103645) 2018-10-13 03:24:44
#23 Rainer Zufall (kiekuk) 1206 (56786) 2018-11-03 12:37:24
#24 Hans Peter (hanspeter) 1204 (52356) 2018-11-08 18:53:31
#25 kilink (kilink) 1200 (8053) 2018-11-18 22:14:22
#26 Luigi Tomelli (archstanton) 1191 (127538) 2018-12-17 12:59:10
#27 Kasia (kasia-tutej) 1187 (53366) 2018-12-31 17:36:11
#28 Szabó Zoltán (szabo.z87) 1185 (55604) 2019-01-08 08:51:43
#29 Nofre Tete (noffi) 1185 (26507) 2019-01-08 21:53:11
#30 zuben c3 (zuben-c3) 1184 (44417) 2019-01-11 10:59:35
#31 Eugene (lim0n) 1161 (195334) 2019-05-12 13:21:42
#32 Marco Cinelli (Snap) 1160 (37769) 2019-05-21 13:00:26
#33 Gerd Wilts (gerdw) 1153 (50634) 2019-07-14 17:26:39
#34 Bart den Hartog (Bart13) 1153 (148936) 2019-07-16 05:21:53
#35 Karl (Aureon) 1143 (2534) 2019-10-30 10:44:19
#36 Lane Williams (planetlane) 1139 (34637) 2019-12-25 21:18:35
#37 Andrei Palangean (palangeanad) 1136 (1136) 2020-02-10 11:55:24
#38 madness (madness) 1132 (71592) 2020-04-21 03:46:01
#39 Bernd (tryone144) 1126 (8066) 2020-08-09 20:09:41
#40 Polaris (Polaris) 1126 (32963) 2020-08-10 01:00:10
#41 Derek Hatton (alfred_noble) 1122 (33998) 2020-11-14 20:15:52
#42 Nicky (Wokini) 1122 (18494) 2020-11-17 13:57:34
#43 DS (DS8279) 1122 (34191) 2020-11-19 21:40:39
#44 Somebody (Achidutzu) 1117 (16767) 2021-04-25 21:14:06
#45 Claude Vaillancourt (Cl3v3r) 1116 (44129) 2021-05-23 19:22:30
#46 Antares (Antares) 1114 (32880) 2021-07-18 05:17:54
#47 thatbusybeaver (thatbusybeaver) 1114 (12456) 2021-07-29 20:41:25
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Weakened ElsieFour — Part 2

[rotthaler-08] - 0 users already solved this challenge, 2 are working on it.
 
 
 

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 2 is a partly-known key challenge which provides 12 consecutive characters of the 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: 2018-04-28 16:36
Maximum number of attempts for this challenge: 15

All successful users of this challenge

No one solved the challenge right now. Be the first!
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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.
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: 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 (132517) 2018-10-06 20:53:41
Michael Möller (michaelm) 1176 (256593) 2019-01-02 09:55:59
D3d4lu5 (D3d4lu5) 1138 (363488) 2019-11-28 19:27:00
Eugene (lim0n) 1115 (195334) 2021-05-10 19:34:04
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The Einstein Enigma

[hiker-01] - 56 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?
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: 2018-02-07 23:40
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#56) Achieved points (Global score) y-m-d - h:m:s

H. Lautenschlager (helmi) 2000 (57600) 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 (132517) 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 (15452) 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 (56037) 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 (256593) 2018-09-02 09:58:19
#35 Random Dude (rnd) 1185 (103645) 2018-09-03 06:05:00
#36 sarah b (silva) 1168 (52424) 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 (44417) 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 (195334) 2019-06-22 15:29:12
#44 Bart den Hartog (Bart13) 1142 (148936) 2019-07-16 03:33:56
#45 Gerd Wilts (gerdw) 1142 (50634) 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 (81614) 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 (24027) 2021-04-18 14:58:41
#56 Antares (Antares) 1111 (32880) 2021-07-18 05:51:46
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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?
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: 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 (57600) 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 Scombes (jerva) 2000 (266541) 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 (132517) 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 (44417) 2019-01-03 20:45:49
#26 Eugene (lim0n) 1145 (195334) 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 (24027) 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 (56037) 2021-05-18 18:53:31
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   +++    [11:38 - 16.09.2021] silva solved the Level II challenge 'Keyshanc — Part 2'    +++    [05:06 - 16.09.2021] gilotyna solved the Level I challenge 'Number Sequence — Part 2'    +++    [04:58 - 16.09.2021] gilotyna solved the Level I challenge 'Original Caesar Cipher'    +++    [04:49 - 16.09.2021] gilotyna solved the Level I challenge 'Number Sequence'    +++    [23:56 - 15.09.2021] theghost2 solved the Level I challenge 'Original Caesar Cipher'    +++