cryptomedium
Vigeneru
duckerz
Task: Decrypt Vigenère-encrypted Russian text and find the hidden flag word. Solution: Used Index of Coincidence to find key length (7), chi-squared test to recover key, then found hidden phrase in decrypted text and hashed it with SHA256.
$ ls tags/ techniques/
index_of_coincidencechi_squared_testvigenere_cryptanalysis
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