MysteryTwister C3

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Level II Challenges (95)

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

Spirale — Part 1

[allard-01] - 2 users already solved this challenge, 2 are working on it.

Spirale is a OTP cipher designed to be simple to implement by hand. It is resilient to errors as they have only a local effect without obscuring all the ciphertext.
Part 1 is a partly-known plaintext challenge with a 314-letter ciphertext. The first 75 letters of the plaintext are known.
Part 2 of this series uses the same four keys as this one.

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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2015-08-23 19:04
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

S Combes (jerva) 1378 (77932) 2015-09-12 21:12:42
J-L Morel (Rossignol) 1143 (23146) 2017-01-19 15:14:20
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   +++    [20:18 - 26.06.2017] george4096 solved the Level II challenge 'ORYX Stream Cipher — Part 4a'    +++    [19:43 - 26.06.2017] D3d4lu5 solved the Level I challenge 'Zodiac Cipher'    +++    [19:41 - 26.06.2017] D3d4lu5 solved the Level I challenge 'Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1'    +++    [21:32 - 25.06.2017] kasia-tutej solved the Level II challenge 'Brute-Force-Attack on Triple-DES with Reduced Key Space'    +++    [10:46 - 25.06.2017] kynguyenngoc solved the Level II challenge 'Cracking SHA1-Hashed Passwords'    +++