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Level II Challenges (160)

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

SIGABA CSP-2900 — Part 1

[kopal-28] - 2 users already solved this challenge.
 
 
 

The SIGABA CSP-2900 was a highly secure encryption machine used by the US for strategic communication in WWII. In this series of challenges, you are provided with a ciphertext and a partially-known plaintext, here with the length of 320 and 120 characters.
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Published on: 2021-07-31 17:47
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#2) Achieved points (Global score) y-m-d - h:m:s

Scombes (jerva) 1824 (266541) 2021-08-02 01:47:14
George Lasry (george4096) 1725 (422251) 2021-08-03 09:42:56
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   +++    [02:29 - 24.09.2021] Bart13 solved the Level I challenge 'Find the right route — Part 3'    +++    [23:22 - 23.09.2021] Bart13 solved the Level I challenge 'Find the right route — Part 2'    +++    [21:33 - 23.09.2021] Bart13 solved the Level I challenge 'Find the right route — Part 1'    +++    [13:57 - 23.09.2021] dega solved the Level I challenge 'Advent-Challenge — Part 1'    +++    [20:19 - 21.09.2021] dega solved the Level II challenge 'Brute-Force-Attack on Triple-DES with Reduced Key Space'    +++