33,181 reputation
566129
bio website bolet.org/~pornin
location Quebec City, Canada
age 39
visits member for 3 years, 5 months
seen Dec 14 at 14:46

Cryptographer, programmer in several languages (C, Java, several assemblies, Pascal, Forth...). I also have a life.


Dec
1
answered Are safe primes $p=2^k \pm s$ with $s$ small less recommandable than others as a discrete log modulus?
Dec
1
answered What is the appropriate public key encryption for secure coin flipping?
Nov
30
revised Software implementation of a commutative cipher?
edited tags
Nov
30
reviewed Approve Software implementation of a commutative cipher?
Nov
29
answered Are there any specific requirements for the function $F$ in a Feistel cipher?
Nov
28
answered Where is the proof of security of Diffie's cipher?
Nov
28
reviewed Approve How much would it cost in U.S. dollars to brute force a 256 bit key in a year?
Nov
27
revised How can one show that an ElGamal-like signature verification scheme is valid?
added 1 characters in body
Nov
27
answered How can one show that an ElGamal-like signature verification scheme is valid?
Nov
26
answered Verilog simulation of Data Encryption Standard
Nov
25
answered How does the wider cryptographic community view non-abelian group based cryptography?
Nov
24
answered Is a book cipher provably secure?
Nov
24
comment Security of simple xor and s-box cipher?
$S$ "exists" as code which can compute a value ($S[x]$) for every $x$. One possible implementation is as a big array. Or you could have a sequence of instructions. That's equivalent here: if you have, e.g., 2 kB of ROM (code + arrays) then you have 16384 bits, and you can possibly compute only $2^{16384}$ distinct functions with that. But there are far many more possible functions with 256-bit inputs than that. Whether you use your ROM budget for code or for data is irrelevant in this computation.
Nov
23
answered Using a Non-Random IV with modes other than CBC
Nov
23
reviewed Approve license-key tag wiki excerpt
Nov
23
reviewed Approve
Nov
23
answered Security of simple xor and s-box cipher?
Nov
22
answered Message space in security definitions
Nov
22
revised Message space in security definitions
More TeX.
Nov
22
revised Message space in security definitions
TeXified equations, fixed grammar.