MysteryTwister C3
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Level II Challenges (96)

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

Double-Column Transposition/Granit — Part 2

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This challenge series is about the GRANIT cipher, a method that can be done manually. It has been used for instance by the former GDR spy Günter Guillaume till about 1960.
Part 1, 2 and 3 of this series use the same keyword for generating the key matrix, but different permutation keys. This part has a ciphertext-only challenge and the ciphertext has 110 characters.
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Published on: 2015-07-01 18:21
Maximum number of attempts for this challenge: 15

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   +++    [13:27 - 23.08.2017] tenchijin solved the Level II challenge 'Broadcasting and low exponent — RSA-Attack'    +++    [10:07 - 23.08.2017] nurnicu solved the Level I challenge 'Number Sequence — Part 2'    +++    [18:15 - 22.08.2017] D3d4lu5 solved the Level II challenge 'ASAC — A Strong(er) ADFGVX Cipher — Part 1'    +++    [18:13 - 22.08.2017] D3d4lu5 solved the Level II challenge 'Double Column Transposition — Part 3'    +++    [18:11 - 22.08.2017] D3d4lu5 solved the Level II challenge 'Double Column Transposition — Part 2'    +++