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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-889 — Part 1

[kopal-25] - 2 users already solved this challenge.

The SIGABA CSP-889 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.

Update June 2021: We replaced the used key (and this changed the ciphertext) since a part of the previous used key was leaked in the newest SIGABA template of CrypTool 2.

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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2021-06-01 13:18
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) 2000 (266541) 2021-06-02 10:40:32
George Lasry (george4096) 1725 (422251) 2021-06-03 22:50:04
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   +++    [11:38 - 16.09.2021] silva solved the Level II challenge 'Keyshanc — Part 2'    +++    [05:06 - 16.09.2021] gilotyna solved the Level I challenge 'Number Sequence — Part 2'    +++    [04:58 - 16.09.2021] gilotyna solved the Level I challenge 'Original Caesar Cipher'    +++    [04:49 - 16.09.2021] gilotyna solved the Level I challenge 'Number Sequence'    +++    [23:56 - 15.09.2021] theghost2 solved the Level I challenge 'Original Caesar Cipher'    +++