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Rarity → MS Office 95 password recovery
Overview of MS Office 95 password protection:
MS Office 95 used its own weak encryption algorithm, which XORed different data with the same key, that it is cryptographically wrong. As far as Office files usually contain known text, so it is possible to do password recovery almost instantly.
File extensions: doc, xls MS Office 95 crypto algorithms: proprietary MS Office 95 encryption weakness: repeated usage of cipher keystream (details...) Possible attacks against MS Office 95: password decryption using known-plaintext Attacks complexity: 24