Level II Challenges (155)
Page 1 of the challenges in
Level II, ordered by date posted (the most recent appear first).
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During the cold war the foreign intelligence agency of Germany established so-called stay-behind units. Their radio messages were encrypted by a OTP method, but the keys were used multiple times.
This challenge is about the effect of this multiple usage on the security of the method. You are given 5 messages, all 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.
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Author:
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Published on: 2015-08-23 19:00 |
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Maximum number of attempts for this challenge: 15 |
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All successful users of this challenge
| Rank |
User (#14) |
Achieved points (Global score) |
y-m-d - h:m:s |
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Armin Krauss (argh)
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1725 (206664) |
2015-08-26 17:13:36 |
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Kurt Gebauer (Yokozuna)
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1576 (276906) |
2015-08-28 22:20:36 |
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Alain (Integral)
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1456 (207924) |
2015-09-04 16:37:12 |
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Bart den Hartog (Bart13)
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1398 (148936) |
2015-09-10 14:30:56 |
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#5 |
Julia Bernotat (El Greco )
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1337 (81129) |
2015-09-21 21:32:23 |
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#6 |
Robert (rm)
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1292 (56475) |
2015-10-08 21:06:29 |
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#7 |
Matthias Kotzerke (Esdeath)
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1182 (4004) |
2016-03-30 19:45:17 |
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#8 |
Em Doulgerakis (Greko)
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1172 (145241) |
2016-05-16 09:35:38 |
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#9 |
Alain Collignon (vexilla72)
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1152 (123466) |
2016-10-10 18:28:06 |
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#10 |
D3d4lu5 (D3d4lu5)
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1130 (363488) |
2017-08-08 22:49:04 |
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#11 |
Nicolas (nicosPavlov)
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1120 (257791) |
2018-04-01 11:44:13 |
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#12 |
Dominik M. (Sgt. Pepper)
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1117 (127349) |
2018-06-21 23:00:27 |
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#13 |
Eugene (lim0n)
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1106 (172873) |
2019-09-28 17:08:21 |
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#14 |
Polaris (Polaris)
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1100 (32963) |
2020-08-16 17:37:58 |
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