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The attacker knows at least one sample of both the plain text and the cipher text.

5 votes
2 answers
567 views

Affine plaintext attack with GCD != 1

I'm trying to crack an affine cipher, but when cracking I cannot find the inverse of a number because the GCD is not 1. This is my plaintext and this is my ciphertext: PLAIN: 072097 108108 CIPHER: 0 …
Wouter Doeland's user avatar