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The RAR5 archive format encrypts file data using AES in CBC mode, and generates a 256-bit key using PBDKF2-HMAC-SHA256 (32768 iterations default?). If an attacker is able to view many files encrypted this way all with the same key, the attack is to recover the key from the ciphertext. This is not an easy task, even if the IV was reused. In WinRAR, the IV ...

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