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18/20 answers
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Apr
26
comment How secure would HMAC-SHA3 be?
@fgrieu: As far as I can tell, the argument is that Keccak provides this level of security when used with the generic sponge MAC construction (= prepend key to message; CSF §5.11.2), of which the inner HMAC pass can be seen as an instance. That security, in turn, is claimed to follow from the Keccak flat sponge claim (Keccak reference §1.5), which is a pretty strong claim that, loosely speaking, says that Keccak is as good as a random oracle against attacks using $\lll 2^{c/2}$ work.
Apr
25
answered How secure would HMAC-SHA3 be?
Apr
25
comment Solving Vignere Encryption
@vignere_solve: OK, here's the hint: I was wrong about letter case. The correct cipher alphabet has 64 characters: AZ, az, 09, + and /. It just happens that, with this particular alphabet and key, most lowercase letters are encrypted to uppercase ones, and vice versa.
Apr
23
revised Obtaining the key length from the ciphertext of an auto-encipher
edited tags
Apr
23
comment Solving Vignere Encryption
@vignere_solve: No problem. Ps. I did solve it, and it turns out that one of the early assumptions I made is wrong. However, you can still decode most of the text despite the wrong assumption, and, once you do, it's not hard to figure out what the mistake it. Let me know if you need a further hint.
Apr
23
revised Solving Vignere Encryption
nicer histograms
Apr
23
answered Solving Vignere Encryption
Apr
21
awarded  hash
Apr
20
awarded  Nice Answer
Apr
20
answered How to calculate Modulo using a standard calculator for a one time pad encryption
Apr
20
answered Security of KDF1 and KDF2 (hash based KDF's)
Apr
19
answered What does it mean when two encrypted files, encrypted with the same method but with different keys, when xor'd together, produce a repeating pattern?
Apr
15
comment Block cipher and parity of permutation
Generalizing your first example, if we start with any permutation, and extend the state space being permuted by at least one extra bit (which does not affect the permutation and is not affected by it), then the resulting extended permutation will be even.
Apr
7
awarded  Nice Answer
Apr
3
revised Cryptographic system with double keys with reversible order
TeX ≠ C
Apr
1
comment What is h in this RSA variant?
Ugh... I looked at the paper to try and fix the broken math formatting in the question, but it turns out to be like that in the paper too. :-( Honestly, most of the paper looks a lot like SCIgen output anyway.
Mar
26
revised Lamport signature: How many signatures are needed to forge a signature?
fix incorrect terminology
Mar
26
answered Lamport signature: How many signatures are needed to forge a signature?
Mar
23
answered Encryption mode with chained algorithms
Mar
23
reviewed Satisfactory Secure degree reduction for Shamir's secret sharing