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Level II Challenges (158)
Page 5 of the challenges in Level II, ordered by date posted (the most recent appear first).
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This challenge series introduces in detail the handling of the differential cryptanalysis (DCA). In the first two challenges you have to decrypt encrypted images and enter the code shown in the images. The second challenge requires filtering. 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.
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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. |
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Published on: 2020-01-28 15:22 |
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Maximum number of attempts for this challenge: 15 |
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All successful users of this challenge
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User (#3) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Eugene (lim0n)
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2000 (178540) |
2020-01-29 05:52:19 |
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Dominik M. (Sgt. Pepper)
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2000 (128575) |
2020-01-29 11:13:43 |
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Kurt Gebauer (Yokozuna)
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1824 (282608) |
2020-01-30 00:15:28 |
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You must be logged in to solve the challenge |
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This is part two of the two polyphonic cipher challenges, where again two or more plaintext letters correspond to one cipher symbol. Can you solve such a cipher? 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.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it. |
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Published on: 2020-01-14 15:20 |
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Maximum number of attempts for this challenge: 10 |
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All successful users of this challenge
| Rank |
User (#17) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Kurt Gebauer (Yokozuna)
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2000 (282608) |
2020-01-14 20:46:51 |
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Snake (snk)
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2000 (187783) |
2020-01-14 21:48:19 |
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Eugene (lim0n)
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2000 (178540) |
2020-01-15 11:18:08 |
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George Lasry (george4096)
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1824 (399565) |
2020-01-16 00:47:13 |
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#5 |
sarah b (silva)
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1523 (47847) |
2020-01-22 11:31:33 |
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#6 |
George (Theofanidis)
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1284 (122085) |
2020-03-04 21:43:19 |
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#7 |
madness (madness)
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1281 (71292) |
2020-03-07 13:38:01 |
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#8 |
Thomas (Thomas4897)
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1273 (36141) |
2020-03-11 18:43:43 |
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#9 |
Dominik M. (Sgt. Pepper)
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1256 (128575) |
2020-03-24 18:22:46 |
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#10 |
Viktor (Veselovský)
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1251 (169444) |
2020-03-29 18:09:04 |
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#11 |
D3d4lu5 (D3d4lu5)
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1222 (363488) |
2020-05-06 18:17:24 |
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#12 |
Alain Collignon (vexilla72)
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1177 (123666) |
2020-09-14 01:19:07 |
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#13 |
Martin (martinbucher)
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1165 (38365) |
2020-11-18 16:11:41 |
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#14 |
Michael (FoM)
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1161 (57794) |
2020-12-12 23:30:41 |
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#15 |
Em Doulgerakis (Greko)
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1153 (193799) |
2021-02-21 22:39:40 |
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#16 |
Luigi Tomelli (archstanton)
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1146 (127538) |
2021-05-06 13:33:01 |
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#17 |
Eric (ExAstris)
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1144 (54941) |
2021-05-24 00:45:44 |
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You must be logged in to solve the challenge |
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This challenge series introduces in detail the handling of the differential cryptanalysis (DCA). In the first two challenges you have to decrypt encrypted images and enter the code shown in the images. The first challenge needs no filtering, as only valid plaintext-ciphertext pairs are delivered. 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.
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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. |
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Published on: 2019-12-22 21:04 |
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Maximum number of attempts for this challenge: 15 |
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All successful users of this challenge
| Rank |
User (#3) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Eugene (lim0n)
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1660 (178540) |
2019-12-26 16:31:43 |
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Kurt Gebauer (Yokozuna)
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1523 (282608) |
2019-12-30 03:08:38 |
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Dominik M. (Sgt. Pepper)
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1456 (128575) |
2020-01-03 18:30:14 |
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You must be logged in to solve the challenge |
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In a polyphonic cipher, two or more plaintext letters correspond to one ciphertext symbol. 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.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it. |
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Published on: 2019-11-21 13:18 |
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Maximum number of attempts for this challenge: 10 |
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All successful users of this challenge
| Rank |
User (#20) |
Achieved points (Global score) |
y-m-d - h:m:s |
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sarah b (silva)
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2000 (47847) |
2019-11-22 10:56:16 |
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Bart den Hartog (Bart13)
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1725 (148936) |
2019-11-23 15:02:52 |
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George Lasry (george4096)
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1725 (399565) |
2019-11-23 17:29:00 |
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Snake (snk)
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1725 (187783) |
2019-11-23 21:47:29 |
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#5 |
D3d4lu5 (D3d4lu5)
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1725 (363488) |
2019-11-23 22:47:12 |
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#6 |
Kurt Gebauer (Yokozuna)
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1547 (282608) |
2019-11-28 02:28:03 |
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#7 |
Eugene (lim0n)
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1423 (178540) |
2019-12-05 17:45:31 |
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#8 |
Danny Higgins (hamster147)
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1349 (39638) |
2019-12-18 00:49:54 |
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#9 |
Random Dude (rnd)
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1337 (103645) |
2019-12-20 18:42:25 |
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#10 |
George (Theofanidis)
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1229 (122085) |
2020-03-01 20:01:11 |
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#11 |
madness (madness)
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1226 (71292) |
2020-03-07 18:57:10 |
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#12 |
Thomas (Thomas4897)
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1223 (36141) |
2020-03-11 18:24:02 |
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#13 |
Dominik M. (Sgt. Pepper)
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1216 (128575) |
2020-03-24 17:35:47 |
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#14 |
Viktor (Veselovský)
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1213 (169444) |
2020-03-30 00:37:50 |
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#15 |
Alain Collignon (vexilla72)
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1169 (123666) |
2020-09-03 11:31:59 |
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#16 |
Martin (martinbucher)
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1164 (38365) |
2020-10-03 09:21:08 |
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#17 |
Michael (FoM)
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1155 (57794) |
2020-12-11 15:27:14 |
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#18 |
Em Doulgerakis (Greko)
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1147 (193799) |
2021-02-21 13:18:25 |
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#19 |
Luigi Tomelli (archstanton)
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1141 (127538) |
2021-05-03 18:39:04 |
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#20 |
Eric (ExAstris)
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1140 (54941) |
2021-05-23 23:37:14 |
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You must be logged in to solve the challenge |
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Cipher ID — Part 1
[mistamp-01] - 15 users already solved this challenge, 6 are working on it.
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Determine which type of classic cipher was used to generate each of 500 ciphertext messages. The ciphers used in this challenge are simple substitution, columnar transposition, Vigenère, Playfair, and Hill. 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.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it. |
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Published on: 2019-11-19 12:00 |
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Maximum number of attempts for this challenge: 20 |
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All successful users of this challenge
| Rank |
User (#15) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Bart den Hartog (Bart13)
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2000 (148936) |
2019-11-19 13:05:00 |
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Viktor (Veselovský)
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2000 (169444) |
2019-11-19 14:41:45 |
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D3d4lu5 (D3d4lu5)
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2000 (363488) |
2019-11-20 00:40:59 |
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Armin Krauss (argh)
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2000 (206965) |
2019-11-20 10:40:28 |
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#5 |
Eugene (lim0n)
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1725 (178540) |
2019-11-21 17:34:47 |
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#6 |
George Lasry (george4096)
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1660 (399565) |
2019-11-22 23:30:33 |
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#7 |
Kurt Gebauer (Yokozuna)
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1613 (282608) |
2019-11-23 22:20:16 |
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#8 |
Snake (snk)
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1444 (187783) |
2019-12-02 11:48:55 |
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#9 |
sakis55555 sakis (sakis55555)
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1252 (1352) |
2020-02-02 00:25:04 |
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#10 |
George (Theofanidis)
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1252 (122085) |
2020-02-02 08:21:12 |
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#11 |
sarah b (silva)
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1248 (47847) |
2020-02-06 10:29:55 |
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#12 |
madness (madness)
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1230 (71292) |
2020-02-27 23:03:53 |
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#13 |
Mike (RogueRamblers)
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1195 (72565) |
2020-05-12 02:33:57 |
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#14 |
Em Doulgerakis (Greko)
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1153 (193799) |
2020-12-27 11:28:04 |
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#15 |
Random Dude (rnd)
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1143 (103645) |
2021-04-10 22:59:57 |
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You must be logged in to solve the challenge |
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