MysteryTwister C3

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Level II Challenges (133)

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

Spirale — Part 1

[allard-01] - 3 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 (#3) Achieved points (Global score) y-m-d - h:m:s

S Combes (jerva) 1378 (99132) 2015-09-12 21:12:42
J-L Morel (Rossignol) 1143 (29425) 2017-01-19 15:14:20
George Lasry (george4096) 1129 (302230) 2017-08-21 20:56:27
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   +++    [13:53 - 21.09.2019] weiting solved the Level II challenge 'RSA: Two different keys — same ciphertext'    +++    [11:13 - 21.09.2019] lim0n solved the Level I challenge 'The Last Note'    +++    [23:26 - 20.09.2019] rekondo solved the Level I challenge 'Original Caesar Cipher'    +++    [23:18 - 20.09.2019] rekondo solved the Level I challenge 'Number Sequence'    +++    [22:53 - 20.09.2019] ibex solved the Level I challenge 'Advent-Challenge — Part 1'    +++