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bio website cs.mu.oz.au/~mgiuca
location Australia
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seen Mar 20 at 9:28

I work for Google Australia on the Google App Engine (Python) team.

comment Using a Non-Random IV with modes other than CBC
"CFB and OFB require only uniqueness ... The is no need for unpredictability" -- This is not what it says in NIST SP800-38A: "For the CBC and CFB modes, the IVs must be unpredictable." It does not explain why, and I don't understand why the IV must be unpredictable for CFB. It does say that OFB does not require an unpredictable IV.