Thomas Pornin

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19,137 reputation
13571
bio website bolet.org/~pornin
location Quebec City, Canada
age 37
visits member for 1 year, 10 months
seen 15 hours ago
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Cryptographer, programmer in several languages (C, Java, several assemblies, Pascal, Forth...). I also have a life.


242 Answers

newest activity votes
40
Best way to reduce chance of hash collisions: Multiple hashes, or larger hash?
30
How much would it cost in U.S. dollars to brute force a 256 bit key in a year?
30
What is the “Random Oracle Model” and why is it controversial?
29
What are the benefits of the two permutation tables in DES?
26
What are the practical difference between 256-bit, 192-bit, and 128-bit AES encryption?
26
Should we MAC-then-encrypt or encrypt-then-MAC?
25
Guarding against cryptanalytic breakthroughs: combining multiple hash functions
22
Why is elliptic curve cryptography not widely used, compared to RSA?
21
Is AES-256 weaker than 192 and 128 bit versions?
20
Identifying encryption method from encrypted string
19
How were the DES S-box values determined?
18
Google is using RC4, but isn't RC4 considered unsafe?
16
Is SHA-512 bijective when hashing a single 512-bit block?
16
How should I calculate the entropy of a password?
15
How can we reason about the cryptographic capabilities of code-breaking agencies like the NSA or GCHQ?
15
How does asymmetric encryption work?
15
What is a white-box implementation of a cryptographic algorithm?
15
RSA with small exponents?
14
Why can't one implement bcrypt in Cuda?
14
Should I use the first or last bits from a sha-256 hash?
14
Why does PBKDF2 xor the iterations of the hash function together?
14
Is using slow password hashing on the client side easier attackable than on the server side?
13
Does the generator size matter in Diffie-Hellman?
13
Does unbalancing a feistel cipher always improve security? Does it improve security at all?
13
How can I use asymmetric encryption, such as RSA, to encrypt an arbitrary length of plaintext?
12
Does the elliptic curve (EC) cryptosystem outperform RSA and DL cryptosystems?
12
understanding a length extension attack
12
How long would the 100 Year Cryptography Project have secured its data had it been started 100 years ago?
11
Is it safe to use file's hash as IV?
11
Which algorithms are used to factorize large integers?
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