cryptography - Should nonce / IV be private as a key? -


in block cipher modes nonce / iv , counters introduced ( http://en.wikipedia.org/wiki/block_cipher_modes_of_operation). should private key , why?

no, nonce/iv there provide distinct outputs provided same input plaintext.

there's no requirements keep them confidential (but shouldn't guessable or re-used usually), , in protocols, e.g. tls >= 1.1, it's sent in clear @ beginning of every encrypted message.


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