# Security based on PRF

I've seen that there is several kinds of PRF, and sometimes people speak about strong PRFs.

When proofs of a protocol or algorithm are given based on the assumption of the use of a PRF, are they speak implicitly about strong PRFs?

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Yes. ${}{}{}\;$ –  Ricky Demer Nov 9 '13 at 9:52
Thank you both for the answer and edit of the question. –  Dingo13 Nov 9 '13 at 14:23