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SM603M - Mathématiques pour la cryptographie (L3-NEW - 2324S6)

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Among the following matrices, which ones are invertible ?

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You receive the following ciphertext: .

Decipher the message knowing that it has been enciphered using an affine transformation on digraphs, using the usual alphabet of 26 letters (a=, b=, etc) and with the following enciphering key:

.

Your answer will be a word (no capital letters).

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durée estimée : 15 Minutes

The alphabet contains characters, we use an affine Vigenere's transformation system based on 2x2 matrices .

Here are two ciphering keys :

1) Among those two keys, only one is correct. Which of the two keys is correct ?

2) Calculate the deciphering key corresponding to the correct key.

3) Decipher the following bigram : .

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