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Apr
7
comment How could Fully Homomorphic Encryption support power operations?
My perspective: The answer says that XOR and AND are universal, and thus any operation, including addition and multiplication, can be built out of XOR and AND gates. That is a correct statement. So the answer seems fine to me. But we can agree to disagree (or have a slightly different reaction) -- nothing wrong with that!
Apr
7
comment How could Fully Homomorphic Encryption support power operations?
@poncho, I don't understand your comment. This answer looks correct to me. The answer never says "ADD==XOR", does it? XOR and AND are universal; no need for NAND.
Apr
7
comment How could Fully Homomorphic Encryption support power operations?
You already answered your own question. "It enables arbitrary functions..." Power is a function.
Apr
7
comment Is it possible to determine or estimate the period for Blum-Micali PRG?
The premise seems faulty. Cycles can occur even if there is no fixed point. So, focusing on fixed points seems mis-placed, if you really care about cycles. But, as I explain in my answer, worrying about short cycles is also mis-placed concern.
Apr
7
answered Is it possible to determine or estimate the period for Blum-Micali PRG?
Apr
6
reviewed Reject Wrong Test Vector for HKDF with HMAC-SHA256
Apr
6
comment Wrong Test Vector for HKDF with HMAC-SHA256
This question appears to be off-topic because it is about software development (try StackOverflow).
Apr
5
awarded  Favorite Question
Apr
5
comment Should we MAC-then-encrypt or encrypt-then-MAC?
I edited the answer to more clearly express the point Josef was trying to make. Personally, I think the answer is fine (I upvoted it).
Apr
5
revised Random oracle model proofs and programmability
Improve the title & question a bit.
Apr
5
reviewed Reject Random oracle model proofs and programmability
Apr
4
revised Should we MAC-then-encrypt or encrypt-then-MAC?
added 448 characters in body
Apr
3
answered Key-dependent encryption in TAHOE-LAFS
Apr
3
comment Key-dependent encryption in TAHOE-LAFS
What is ENC, specifically? How is it instantiated?
Apr
2
answered How do I create a short signature? (e.g. less than 100 bytes)
Apr
2
comment Combining multiple symmetric encryption algorithms - implications?
@StephenTouset, oh, right, thank you! Boy that was a dumb thing to write. :-) I appreciate the comment.
Apr
2
revised Combining multiple symmetric encryption algorithms - implications?
Address a typo spotted by Stephen Touset.
Mar
31
answered Operation sequence authentication shared storage
Mar
31
comment Can a commutative block cipher be indistinguishable from a random permutation, for fixed key?
@fgrieu, yes, maybe posting a separate question would be best. When you do, can you spell out how we choose a random set of permutations with the commutativity property? Is that notion uniquely defined?
Mar
30
comment HKDF vs TLS PRF. Which of the one is better?
Better, in what sense? More secure, in what sense? For what purposes? Under what threat model? This question is too vague as it stands; I suggest you edit it to make it more specific.