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seen Oct 9 at 20:45

Aug
31
comment Recent attacks on RSA
Seems that Schneier (and other cryptographers) agree with me: schneier.com/blog/archives/2013/08/the_cryptopocal.html
Aug
30
awarded  Good Question
Aug
30
comment Do ciphertexts leak information about their algorithmic creators?
So if I say "I have 1024 bits of ciphertext" you can definitively ascertain whether that is an output from Rijndael-1024, or it's three blocks of AES-CBC with a random IV? I can't.
Aug
25
comment Do ciphertexts leak information about their algorithmic creators?
@Ninveh You're confusing block cipher encipherment with full-blown encryption again. The concept of an "IV" does not apply to AES, Twofish, Serpent, etc. That's an idea used with modes in order to (typically) implement randomization. So you can't say "IV structure in some ciphers". In any case, the normal approach to security in crypto is to NOT try to hide which algorithms have been used at all (unless you are the NSA).
Aug
24
answered Do ciphertexts leak information about their algorithmic creators?
Aug
24
awarded  Yearling
Aug
3
accepted Recent attacks on RSA
Aug
3
comment Recent attacks on RSA
Elliptic curve cryptanalysis has had 1/100th the attention of RSA and yet these guys want to run to it? I'm guessing if we start to convert to ECC, the recommended key lengths will quickly increase in the next few years.
Aug
3
comment Recent attacks on RSA
Thanks for posting this. I am not an algebraist, but breakthroughs in discrete log for small-characteristic finite fields doesn't seem particularly related to factoring in zero-characteristic rings like $\mathbb{Z}$. Of course it may be relevant to RSA (which is on the ring $\mathbb{Z}_N$) and despite many wrong proclamations in the cited articles, breaking RSA does not require factoring. In any case, in my opinion the presenters have overstepped in declaring a state of emergency with respect to RSA. Remember 10 years ago all the factorization papers (Bernstein and Shamir mostly)?
Aug
2
comment Recent attacks on RSA
That post refers to the Blackhat speakers as "experts in cryptography." I have been a professional cryptographer for 20 years... I have never heard of these guys...
Aug
2
revised Recent attacks on RSA
added 4 characters in body
Aug
2
asked Recent attacks on RSA
Jul
26
answered Now that quantum computers have been out for a while, has RSA been cracked?
May
23
awarded  Popular Question
Apr
24
answered Are cryptographic hash functions perfect hash functions?
Jan
24
awarded  Nice Question
Jan
24
comment Why is MixColumns omitted from the last round of AES?
@PaŭloEbermann Yes, but you need a separate set of precomputed table just for the final round. This is onerous in environments where memory is tight.
Dec
13
awarded  Popular Question
Dec
4
revised What are the practical differences between 256-bit, 192-bit, and 128-bit AES encryption?
added 114 characters in body
Dec
4
awarded  Necromancer