How Not to Encrypt a File — Courtesy of Microsoft
Robert Parks
8616

Are you sure there is a problem using IV=Key? (Assuming that you don’t send the IV along with the ciphertext [which the author mentioned] and you refresh the key for every byte stream [which probably wasn’t mentioned]).

See here: https://crypto.stackexchange.com/questions/16161/problems-with-using-aes-key-as-iv-in-cbc-mode

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