MysteryTwister C3
NUMBER OF ACTIVE MEMBERS:

9977
Follow us: Facebook Twitter

Server maintenance from November 29 to December 2, 2019

MysteryTwister C3 will be offline due to maintenance work starting on Friday November 29, 2019 at 9:00 AM UTC.
 



Level II Challenges (134)

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] - 13 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.
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: 2015-08-23 19:00
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#13) Achieved points (Global score) y-m-d - h:m:s

Armin Krauss (argh) 1725 (188214) 2015-08-26 17:13:36
Kurt Gebauer (Yokozuna) 1576 (177433) 2015-08-28 22:20:36
Alain (Integral) 1456 (207924) 2015-09-04 16:37:12
Bart den Hartog (Bart13) 1398 (145694) 2015-09-10 14:30:56
#5 Julia Bernotat (El Greco ) 1337 (81129) 2015-09-21 21:32:23
#6 Robert (rm) 1292 (56475) 2015-10-08 21:06:29
#7 Matthias Kotzerke (Esdeath) 1182 (4004) 2016-03-30 19:45:17
#8 Em Doulgerakis (Greko) 1172 (131437) 2016-05-16 09:35:38
#9 Alain Collignon (vexilla72) 1152 (96903) 2016-10-10 18:28:06
#10 D3d4lu5 (D3d4lu5) 1130 (297709) 2017-08-08 22:49:04
#11 Nicolas (nicosPavlov) 1120 (151166) 2018-04-01 11:44:13
#12 Dominik M. (Sgt. Pepper) 1117 (97919) 2018-06-21 23:00:27
#13 Eugene (lim0n) 1106 (68786) 2019-09-28 17:08:21
You must be logged in to solve the challenge
Pages [1] 1 Show All  
 
 
powered by the CrypTool project  CrypTool

 

   +++    [00:51 - 17.11.2019] alfred_noble solved the Level II challenge 'A really long number sequence'    +++    [23:44 - 16.11.2019] Reslo solved the Level I challenge 'Number Sequence'    +++    [13:49 - 16.11.2019] lim0n solved the Level II challenge 'Holographic Encryption — Part 2'    +++    [01:01 - 16.11.2019] RogueRamblers solved the Level II challenge 'ORYX Stream Cipher — Part 3 (revised)'    +++    [20:54 - 15.11.2019] alfred_noble solved the Level I challenge 'Pigpen with a twist — Part 1'    +++