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seen Nov 17 '13 at 18:18

Jan
4
awarded  Nice Answer
Sep
13
reviewed Close What is the relation between hash chaining and chosen prefix attack
Sep
13
reviewed Close Why do PKI schemes need security proofs?
Sep
13
reviewed Close Stream vs Block cipher: Synchronising and the receiver
Aug
27
comment Is there a cryptographic function or system in which it becomes HARDER to break as time passes?
Thanks. I found a pointer to what I was thinking of: lsv.ens-cachan.fr/Seminaires/?sem=201201171100
Aug
27
comment Is there a cryptographic function or system in which it becomes HARDER to break as time passes?
Only quantum based crypto has a chance to fit. Indeed, computational based crypto becomes easier to break as your computing power increases (and computing power isn't going to decrease, unless there is a huge societal collapse). For quantum crypto, maintaining an intercepted (quantum) state intact for a long time is hard, so there is a chance that it could give a positive answer.
Aug
26
comment estimating entropy/randomness as fail-safe mechanism
Interesting link, using an entropy estimator can be dangerous: eprint.iacr.org/2013/338
Aug
24
answered Do ciphertexts leak information about their algorithmic creators?
Aug
24
comment Is size Q equal to size SHA(Q)?
Duplicate of math.stackexchange.com/questions/475049/…
Aug
24
answered Three-way key exchange with elliptic curves without pairing
Aug
24
reviewed Close what is pairing in cryptography?
Aug
24
reviewed Close Create a field in PBC
Aug
24
reviewed Close Three-way key exchange with elliptic curves without pairing
Aug
24
answered Quadratic residue problem on composite integers
Aug
23
comment Three-way key exchange with elliptic curves without pairing
Then, there is no single-round protocol known. Use Burmester-Desmedt.
Aug
23
comment Three-way key exchange with elliptic curves without pairing
If a (symmetric) pairing is available then $e(Q_1,Q_2)^{d_3}$ is a common key.
Aug
23
comment Three-way key exchange with elliptic curves without pairing
I got this. But what is $Q_1\cdot Q_2$ ?
Aug
23
comment Three-way key exchange with elliptic curves without pairing
What do you mean by $Q_1\cdot Q_2$ ? There is no standard operation to multiply points of an elliptic curve.
Aug
23
answered what is pairing in cryptography?
Aug
22
comment Create a field in PBC
Isn't the size of ints on your machine a bit small for cryptographic data ?