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I like crypto. Need I say more?


Oct
29
comment XOR secret sharing scheme
if $a=a_1\oplus a_2\oplus\dots\oplus a_n$, if you have less than $n$ shares you cannot reconstruct $a$. Are you sure you aren't wanting shamir secret sharing?
Oct
29
comment XOR secret sharing scheme
with xor secret sharing $t=n$, no?
Oct
29
comment XOR secret sharing scheme
I don't think you can with xor sharing. You could with additive secret sharing or shamir secret sharing. You can certainly get the xor of a and b.
Oct
29
comment What is the definition of “security beyond the birthday paradox”?
@DrLecter you should write that up as an answer.
Oct
29
comment PAK Diffie-Hellman vs. sharing high-entropy key
Do either of you care to put your comments as answers?
Oct
28
asked Why is a simple hash into $G_2$ for (certain) pairing based crypto not possible?
Oct
28
awarded  Announcer
Oct
23
comment How difficult is it to brute force d in RSA: d = (1/e) mod φ in a CPT attack?
$\varphi$ is euler's totient function
Oct
23
answered How difficult is it to brute force d in RSA: d = (1/e) mod φ in a CPT attack?
Oct
23
comment How difficult is it to brute force d in RSA: d = (1/e) mod φ in a CPT attack?
you can also omit odd values for $\varphi$ since $p,q$ are prime (hence odd), $p-1,q-1$ are both even, so $(p-1)(q-1)$ is even.
Oct
22
comment Genuine encryption from only one source?
Signatures can only be created with the private key. Publishing the public key will not allow them to sign anything.
Oct
22
reviewed Leave Open Logics for Cryptographic Information Games
Oct
22
comment MARS and RC6 in CUDA
@pg1989 actually the question is asking for references to existing cuda implementations of block ciphers, which is a pretty poor question. it could probably be made much better by focusing more on what you said.
Oct
22
reviewed Leave Open MARS and RC6 in CUDA
Oct
22
comment Genuine encryption from only one source?
The token could have an expiration date, or users could download from the server a revocation list.
Oct
21
comment FHE - Brakerski's “Scale Invariant” Scheme
I believe this is the paper: eprint.iacr.org/2012/078.pdf
Oct
21
comment Genuine encryption from only one source?
Cross posted: stackoverflow.com/questions/19503224/… please note that cross posting is discouraged.
Oct
21
answered Genuine encryption from only one source?
Oct
21
comment Security of cloud computational protocols in UC Framework?
@curious, the benefit of this paradigm is in proving complex protocols. Say I have a complex protocol $\pi$ that can be broken up into 3 sub protocols, $\pi_1\circ\pi_2\circ\pi_3$, where $\circ$ is some sort of composition. If I have proved the security of each sub protocol in the UC framework, I can replace them with their ideal functionalities $\mathcal{F}_1,\mathcal{F}_2,\mathcal{F}_3$ in the complex protocol to make proving the complex one easier. I don't believe you get this ability in game-based proofs.
Oct
21
revised Security of cloud computational protocols in UC Framework?
added 33 characters in body