![]() ![]() This is necessary, at least, so that an adversary cannot detect whether two encrypted messages have the same plaintext. ![]() (There's an option -nosalt to use a fixed IV, which is even worse for security and shouldn't be done unless the password was itself generated randomly for a single message.)Īll non-broken modes of encryption have an IV or equivalent, so that encrypting the same message twice results in different ciphertexts. When you encrypt the same message twice, the IV changes. The openssl enc command creates an IV with 8 fixed bytes and 8 random bytes (it should be 16 random bytes). The IV for CBC should be uniformly random and unpredictable. It is sent with the data so that the recipient has what they need to decrypt the message. �F݇��.CBC requires an IV: the very first block of data should be random. ![]() 1 bob bob 128 Mar 22 14:03 reply_secret.enc
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