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Mar
3
answered Security of Pohlig-Hellman exponentation cipher?
Mar
3
revised Why do we assume un-security of communication channel on every cryptography system
clean up a little bit of the English.
Mar
3
comment Are there any practical implementation of a homomorphic hashing or signature scheme?
@PaŭloEbermann, I don't think you did anything wrong. The original question was poorly posed: it asked for an implementation, but it didn't specify what particular scheme it wanted an implementation of. There are many schemes in this space, and it's odd to ask for an implementation without knowing which scheme you want an implementation of. I think your edits improved the question.
Mar
2
comment What is “Blinding” used for in cryptography?
@HenrickHellström, the defense I have described (namely, blinding $x$) is a standard defense against timing attacks on RSA. To my knowledge, this method of blinding defends against all known timing attacks against RSA (i.e., against all attacks that are capable of recovering $d$). I do not know of any timing attack that works if $x$ is blinded in this way (i.e., any timing attack that can recover $d$ without knowledge of the value-to-be-raised). If you know of anything that contradicts this, I'd certainly be interested to hear.
Mar
2
comment Finding roots in $\mathbb{Z}_p$
@fgrieu, good question. Actually, now that I take another look at those two papers, the running time seems to be linear in $n$, whereas we'd really want a running time that is poly($\log n$). I don't know whether there are efficient algorithms for large $n$.
Mar
2
revised Finding roots in $\mathbb{Z}_p$
added 26 characters in body; added 155 characters in body
Mar
2
answered Can I combine two PRNGs to make use of more seed data?
Mar
2
revised Finding roots in $\mathbb{Z}_p$
added 214 characters in body
Mar
2
revised Finding roots in $\mathbb{Z}_p$
deleted 37 characters in body
Mar
2
revised Finding roots in $\mathbb{Z}_p$
added 478 characters in body
Mar
2
answered Finding roots in $\mathbb{Z}_p$
Mar
2
comment Timing attack on modular exponentiation
Since you asked about blinding, some info on blinding is available on this site and on Wikipedia.
Mar
2
comment Timing attack on modular exponentiation
Welcome to Crypto.SE, Smit Johnth. Please understand: we expect you to do a little bit of background research on your own before asking here. In particular, information on this is already available on Wikipedia. There's also info elsewhere on this site (e.g., crypto.stackexchange.com/q/3775/351). I recommend you do a little more background reading, then come back if you have a question not already answered in standard resources.
Feb
27
comment Are there any practical implementation of a homomorphic hashing or signature scheme?
@sashank, Your question is very broad. It would help if you gave more specific requirements specific to your particular problem, about exactly what algebraic structure you have on $A$ and $B$ in your particular application. Also, on this site we expect you to do some background research of your own to learn what is already known.
Feb
27
revised Are there any practical implementation of a homomorphic hashing or signature scheme?
added 942 characters in body
Feb
27
answered Are there any practical implementation of a homomorphic hashing or signature scheme?
Feb
27
revised Are there any practical implementation of a homomorphic hashing or signature scheme?
correct a typo
Feb
27
comment Are there any practical implementation of a homomorphic hashing or signature scheme?
sashank, I think you might need to specify more precisely exactly what you mean by homomorphic hashing.
Feb
27
revised Is TrueCrypt's multiple/cascading encryption safe?
Eliminate a lot of the ranty bits. Focus on the question, and remove the undocumented assertions. Be less argumentative. Try to identify a question that is objectively answerable.
Feb
23
answered Why nobody considers counter re-keying as a standard Block Cipher Mode?