Bkcrack - Crack Legacy Zip Encryption With Biham And Kocher's Known Plaintext Attack

Crack legacy zip encryption with Biham and Kocher's known plaintext attack.

Overview

A ZIP archive may contain many entries whose content can be compressed and/or encrypted. In particular, entries can be encrypted with a password-based Encryption Algorithm symmetric encryption algorithm referred to as traditional PKWARE encryption, legacy encryption or ZipCrypto. This algorithm generates a pseudo-random stream of bytes (keystream) which is XORed to the entry's content (plaintext) to produce encrypted data (ciphertext). The generator's state, made of three 32-bits integers, …

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