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No, in general you cannot. WinRAR uses AES (128 or 256 depending on version) for encryption, which does not allow key recovery even with know plaintext and ciphertext. It also uses key stretching to derive the encryption key from a password. The algorithm used is PBKDF2 with a version dependent iteration count. So a key-guessing attack is only possible for ...


When using symmetric encryption is it important to compress the data first? No, not really (unless you're concerned with bandwidth usage). On the other hand, compressing the message can leak data (for example, how compressible the data is). Could it be the case for some ciphers but not for others? No, or at least, not for any cipher that we would ...

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