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Oct
23
comment Should I use the first or last bits from a SHA-256 hash?
@Pacerier - No. There is no reason to believe that using the last bits would be detrimental to security (and there are very strong reasons to expect that it is not detrimental). You're misreading the contents of that link.
Oct
21
comment What's wrong with MARS?
"As I understand only MARS and Serpent implement measures to counter future cryptoanalytic attacks" - Your understanding is faulty. All of the finalists (probably all of the submissions, or essentially all of them) included measures that their designers hoped would counter future cryptanalytic attacks.
Oct
21
comment What's wrong with MARS?
Did you read any of the analysis that was published on MARS? There were a series of workshops with a whole bunch of papers that came out of the proces. Did you read NIST's document explaining their final choice of the AES? If not, those would be good documents to go read!
Oct
21
revised How to verify a number encrypted with an unknown key
Clarify the question. Especially, step 2.
Oct
21
awarded  hash
Oct
20
revised Does encrypting a hash of the message yield a secure MAC?
added 2852 characters in body
Oct
20
answered Does encrypting a hash of the message yield a secure MAC?
Oct
20
revised Does encrypting a hash of the message yield a secure MAC?
Clean up the title. It's not whether we "consider" it secure, the question is whether it *is* secure.
Oct
20
revised Proof that MACing a hash of the message is also a secure MAC
Fix title. Clean up wording. Improve tags.
Oct
20
comment Encoding information in packet lengths to actively sidestep encryption
The relevant concepts are: "side channels", "covert channels", and "steganography". As K.G. said, covert channels or stego are probably the ones most relevant to you.
Oct
14
answered Why to try get key out of white box crypto? How can one protect WBC itself?
Oct
11
reviewed Reject suggested edit on literature tag wiki excerpt
Oct
11
reviewed Reject suggested edit on literature tag wiki
Oct
10
revised NP complete problems related to permutations of binary vectors or block ciphers
added 242 characters in body
Oct
10
answered NP complete problems related to permutations of binary vectors or block ciphers
Oct
10
comment The Goldreich-Goldwasser-Micali Construction with bad PRGS
I very much doubt that GGM will offer useful security if the underlying PRG has a significant bias. I think your argument is unconvincing and your hypothesis is unlikely to hold.
Oct
8
reviewed Reject suggested edit on timestamping tag wiki excerpt
Oct
8
reviewed Reject suggested edit on timestamping tag wiki
Oct
8
comment Predicting values from a Linear Congruential Generator
See also security.stackexchange.com/q/4268/971 for more on cracking LCGs (though with a different set of assumptions).
Oct
8
answered WIN LM Password Hashes (using John the ripper)