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Level II Challenges (139)

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

Double-Column Transposition/Granit — Part 1

[drobick-01] - 0 users already solved this challenge, 2 are working on it.

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. In this part a codebook is used additionally, and the given ciphertext has 70 characters.

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Published on: 2015-07-01 18:20
Maximum number of attempts for this challenge: 15

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