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Sep
13
revised Salsa20 in Davies-Meyer mode with a fixed key (message): is it one-way?
Make the title match the question.
Sep
13
comment Difference between linear cryptanalysis and differential cryptanalysis
What research have you done? Have you read about linear cryptanalysis and differential cryptanalysis? There's lots written about them; that would be the best place to start.
Sep
13
awarded  Good Question
Sep
12
comment Break a simple compression function of a cryptographic hash function
This question appears to be off-topic because it does not comply with our policy about homework. It does not show prior research or any research effort. It is just a "Please solve my homework for me", with a plain problem copied out of a textbook/homework problem.
Sep
12
answered Break a simple compression function of a cryptographic hash function
Sep
12
comment Break a simple compression function of a cryptographic hash function
Also, you should specify how long unsigned long long is, on your machine model. Is it a 64-bit integer? You should specify what you mean by "sum of the last compressions". Do you mean the sum of all previous results from the compress function? If so, is it addition modulo $2^{64}$ (not, say, xor)?
Sep
12
comment Break a simple compression function of a cryptographic hash function
In what context did you run into this? Is it a homework, or did you find it in some real system (if so, which?)? If it is a homework, what have you tried so far? We don't do your homework for you; we expect you to tell us what you've tried and where you got stuck. I suggest you edit the question to make these points more explicit.
Sep
12
answered Combining multiple symmetric encryption algorithms - implications?
Sep
12
comment Can the AES encryption and decryption algorithms be described as a polynomial for a specific key?
@pg1989, right, that's why I said it does not seem to help cryptanalyze AES. :-)
Sep
12
answered Possible ECC backdoor and its impact on Internet traffic
Sep
12
answered Can the AES encryption and decryption algorithms be described as a polynomial for a specific key?
Sep
12
awarded  Notable Question
Sep
12
awarded  Famous Question
Sep
11
answered What key exchange do OpenSSL and CryptoAPI prefer by default?
Sep
11
awarded  Good Question
Sep
11
awarded  Notable Question
Sep
11
awarded  Nice Question
Sep
11
awarded  Popular Question
Sep
11
reviewed Approve suggested edit on How do you find a cheater in Shamir Secret Sharing?
Sep
11
revised Hide a weakness in ECC by choosing the prime or one of the curve coefficients
Make title reflect my last revision.