MysteryTwister C3
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Level II Challenges (96)

Page 1 of the challenges in Level II, ordered by date posted (the most recent appear first).

Flawed Usage of a OTP Cipher by the BND

[drobick-04] - 10 users already solved this challenge.
 
 
 

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.
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Published on: 2015-08-23 19:00
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#10) Achieved points (Global score) y-m-d - h:m:s

Armin Krauss (argh) 1725 (155287) 2015-08-26 17:13:36
Kurt Gebauer (Yokozuna) 1576 (120839) 2015-08-28 22:20:36
Alain (Integral) 1456 (198642) 2015-09-04 16:37:12
Bart den Hartog (Bart13) 1398 (116412) 2015-09-10 14:30:56
#5 Julia Bernotat (El Greco ) 1337 (81129) 2015-09-21 21:32:23
#6 Robert (rm) 1292 (56012) 2015-10-08 21:06:29
#7 Matthias Kotzerke (Esdeath) 1182 (4004) 2016-03-30 19:45:17
#8 Em Doulgerakis (Greko) 1172 (109970) 2016-05-16 09:35:38
#9 Alain Collignon (vexilla72) 1152 (51007) 2016-10-10 18:28:06
#10 D3d4lu5 (D3d4lu5) 1130 (52138) 2017-08-08 22:49:04
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   +++    [14:51 - 17.08.2017] Cysol solved the Level I challenge 'Number Sequence'    +++    [14:45 - 17.08.2017] Sabine solved the Level I challenge 'Monoalphabetic Substitution'    +++    [00:17 - 16.08.2017] squaredoc solved the Level I challenge 'Number Sequence — Part 7'    +++    [20:54 - 15.08.2017] MandelToast solved the Level I challenge 'Number Sequence — Part 7'    +++    [20:11 - 15.08.2017] MandelToast solved the Level I challenge 'Factorization Cipher — Part 1'    +++