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Cipher block chaining (CBC) is a method for encrypting large amounts of data with a block cipher that can only encrypt fixed length plaintexts. When used with an unpredictable initialization vector (IV), it is secure against chosen plaintext attacks (CPA-secure).

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public key encryption, and because the messages are big instead of encrypting the entire message via RSA I am encrypting a random AES-128 key with the PK and then encrypting the message with that in AES-CBC … Questions: Is it safe to use the key as the IV of the CBC? The rationale here is the key is unique and random for each message and I'm not seeing a problem. …
asked Dec 28 '16 by Searinox