Ricky Demer
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 Jul 28 comment Signature and hash function properties "collision resistance implies preimage resistance" only in the sense that second-preimage resistance also implies preimage resistance. $\;$ Jul 27 comment CPA-security of a pseudorandom permutation encryption scheme You appear to be missing the "prove that this scheme is CPA-secure for ..." part. $\;$ Jul 26 comment Show How to Efficiently Solve the Computational Diffie-Hellman Assumption given an Algorithm that Solves the Square-DH Problem cross-posted from MSE after less than 2 minutes, and answered there $\;$ Jul 26 comment Example: pre-image resistance to second pre-image resistance You would need to make the same tests as for any arbitrary construction: crypto.stackexchange.com/q/183/991 Jul 26 comment Converting a pre-image resistant hash to second pre-image resistant The only better description I can think of would be a summary of the abstract. $\;$ Jul 26 revised Converting a pre-image resistant hash to second pre-image resistant gave paper's title Jul 25 answered Simulator in Private Outsourced Computation over Outsourced Datasets Jul 25 revised Can a 1 byte difference in AES 128 bit keys make huge difference in output? fixed title's grammar Jul 23 comment What is k in RSA? No, since the image should have an open-parenthesis just before the $k$. $\;$ Jul 23 revised How can I generate a good password from a SHA512 hash? general copy-editing Jul 23 comment What is k in RSA? You go to the "Computation" section of the page I linked to. $\;$ Jul 23 answered What is k in RSA? Jul 23 revised How can I read the AE figures? replaced noun-phrase with question and replaced "in-" with "input" Jul 22 answered Converting a pre-image resistant hash to second pre-image resistant Jul 22 comment Shuffleless PRNG function with non-repeating values? There is a much cheaper and more efficient method; it just only does the $\hspace{1.76 in}$ currently-relevant parts of each shuffle. $\;$ Jul 22 comment Shuffleless PRNG function with non-repeating values? "without shuffles/arrays" seems like a rather arbitrary requirement. $\;$ Jul 22 comment i cant understand the meaning and the difference between linearity equation and affine and non linearity? The expression with $\oplus$s. $\;$ Jul 22 comment i cant understand the meaning and the difference between linearity equation and affine and non linearity? That expression is affine even if $\: a_{\hspace{.02 in}0}\hspace{-0.03 in} = 0 \;$. $\;\;\;\;$ Jul 20 comment Implementing forward secrecy in OpenPGP with public key authentication In other words, do you also require forward authenticity? $\;$ Jul 20 comment Implementing forward secrecy in OpenPGP with public key authentication "forward secrecy" ... "sent from that user." $\:$ Do you actually mean forward security? $\:$ The situations for secrecy and authenticity are rather different. $\;\;\;\;$