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Spirale — Part 1 Level 2

by Philippe Allard, published on 8/23/2015

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.