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I like crypto. Need I say more?


Nov
5
comment secret sharing of product of 2 numbers
@freak_warrior, FYI I asked a specific question about the multiplicative version: crypto.stackexchange.com/questions/11535/…
Nov
5
comment Is multiplicative secret sharing secure?
Is it also (information theoretically) secure for the multiplicative group of the finite field $GF(2^n)$?
Nov
5
asked Is multiplicative secret sharing secure?
Nov
5
reviewed Approve suggested edit on Threshold cryptosystem with a required share
Nov
5
awarded  Nice Question
Nov
5
comment What is so special about elliptic curves?
The ECs that you see that look nice are over the reals. The elliptic curves over finite fields do not look that way at all. In fact they look pretty random which is another reason they are good for cryptography. AFAIK other functions over finite fields do not form a group.
Nov
5
answered What is so special about elliptic curves?
Nov
4
comment secret sharing of product of 2 numbers
@freak_warrior, no $a_j+b_j$ gives a share of $a+b$, $a_jb_j$ gives a share of $ab$ but with the caveats listed above.
Nov
2
comment RSA 896 vs 1024 vs 2048 in Javascript?
Why are you not using RSA for key exchange and then use symmetric encryption for confidentiality and integrity?
Nov
2
answered secret sharing of product of 2 numbers
Nov
2
comment secret sharing of product of 2 numbers
What secret sharing technique are you using? Shamir?
Nov
1
revised Question about the definition of a perfect cipher
deleted 7 characters in body
Nov
1
comment Question about the definition of a perfect cipher
@PaŭloEbermann correct and important since the keyspace is larger than the ciphertext space. I'll fix it.
Nov
1
answered Question about the definition of a perfect cipher
Nov
1
comment Question about the definition of a perfect cipher
P.S., you are correct in your probability. Try applying Bayes rule.
Nov
1
comment Question about the definition of a perfect cipher
Welcome to Crypto.SE. I hope you find the site useful. Is this homework? If so, we allow homework questions, but expect you to describe what you have tried that hasn't worked, etc. See here.
Nov
1
comment How to develop a public key cryptosystem based on a hard problem?
I think what we are seeing here is that there is no set process for taking a hard problem and turning it into a public key cryptosystem. I agree with DrLecter that you probably need to post more details here about your specific problem before we can help.
Oct
30
answered XOR secret sharing scheme
Oct
29
answered Why do authors say conflicting things regarding leak-free stages in their paper?
Oct
29
comment Why do authors say conflicting things regarding leak-free stages in their paper?
I think they are saying assuming leak free is necessary to prove security for their protocol, but it woul be really cool (thus an open problem) to design a protocol that can tolerate leaks in any stage.