11,634 reputation
11049
bio website vyznev.net
location Helsinki, Finland
age
visits member for 2 years, 11 months
seen 19 hours ago

I'm a PhD student in biomathematics, working on stochastic individual-based models of evolution in spatially structured populations. My other interests include cryptography, programming games and puzzles, photography and graphic design.

I started programming (in AmigaBASIC) when I was 10 years old. Nowadays, I'm most comfortable using Perl, C and JavaScript. I know Java and PHP too, but I can't really say I like them. I also know some Python, but not as much as I'd like.


CC-Zero Please consider any (original) code I post to Stack Overflow and other Stack Exchange sites to be released under CC-Zero unless stated otherwise. You may do whatever you want with it and don't have to credit me in any way, although of course that would be nice.


I'm the main author and maintainer of the Stack Overflow Unofficial Patch (SOUP), a user script for browsers with GreaseMonkey-compatible user script support (Firefox, Chrome, Opera, possibly Safari) that fixes or works around a number of outstanding issues with the Stack Exchange user interface.

I tend to answer a lot more questions than I ask. Some answers I'm rather proud of:


May
9
revised Size of p in ElGamal cryptosystem?
correct spelling of ElGamal, texify, grammar
May
9
revised Why is Triple DES not vulnerable to meet in the middle attacks?
deleted 181 characters in body
May
9
revised Why is Triple DES not vulnerable to meet in the middle attacks?
texify, misc. copyedits
May
8
comment Decrypt a public encrypted message and Sign a signature, how the math is different?
@CodesInChaos: I think this could actually be a pretty good "FAQ" question, and your comment, with some embellishment (e.g. compare RSA signing with RSA encryption and DSA / ElGamal signing with ElGamal encryption), could make a good answer for it. I may try to write one later, unless someone else does it first.
May
5
comment Difference between a nonce and IV
Related, but less specific question: crypto.stackexchange.com/questions/3965/…
May
4
comment How do I produce a stream of secure random numbers from AES-Counter mode?
@owlstead: I'm not aware of any attacks for $E_K(K)$, but there's definitely an attack for, say, $E_K(D_K(0))$.
Apr
30
answered Can XEX or XTS modes be used with only one tweak?
Apr
30
answered Why is Triple DES not vulnerable to meet in the middle attacks?
Apr
26
comment How secure would HMAC-SHA3 be?
@fgrieu: As far as I can tell, the argument is that Keccak provides this level of security when used with the generic sponge MAC construction (= prepend key to message; CSF §5.11.2), of which the inner HMAC pass can be seen as an instance. That security, in turn, is claimed to follow from the Keccak flat sponge claim (Keccak reference §1.5), which is a pretty strong claim that, loosely speaking, says that Keccak is as good as a random oracle against attacks using $\lll 2^{c/2}$ work.
Apr
25
answered How secure would HMAC-SHA3 be?
Apr
25
comment Solving Vignere Encryption
@vignere_solve: OK, here's the hint: I was wrong about letter case. The correct cipher alphabet has 64 characters: AZ, az, 09, + and /. It just happens that, with this particular alphabet and key, most lowercase letters are encrypted to uppercase ones, and vice versa.
Apr
23
revised Obtaining the key length from the ciphertext of an auto-encipher
edited tags
Apr
23
comment Solving Vignere Encryption
@vignere_solve: No problem. Ps. I did solve it, and it turns out that one of the early assumptions I made is wrong. However, you can still decode most of the text despite the wrong assumption, and, once you do, it's not hard to figure out what the mistake it. Let me know if you need a further hint.
Apr
23
revised Solving Vignere Encryption
nicer histograms
Apr
23
answered Solving Vignere Encryption
Apr
23
comment What can I change in Lane to
Your question title appears to
Apr
21
awarded  hash
Apr
20
awarded  Nice Answer
Apr
20
answered How to calculate Modulo using a standard calculator for a one time pad encryption
Apr
20
answered Security of KDF1 and KDF2 (hash based KDF's)