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fgrieu

Paris, France

I'm an engineer with experience in applied cryptography, in particular in Smart Card systems.

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Top Questions
10 votes

Are safe primes $p=2^k \pm s$ with $s$ small less recommandable than others as a discrete log modulus?

discrete-logarithm prime-numbers asked Dec 1 '11 at 6:21
crypto.stackexchange.com

9 votes

Proving knowledge of a preimage of a hash without disclosing it?

hash zero-knowledge-proofs asked Jan 28 '12 at 10:55
crypto.stackexchange.com

9 votes

C: replace AES FIPS-197 SubBytes table by constant-time code

code-challenge c cryptography asked Dec 21 '12 at 17:40
codegolf.stackexchange.com

8 votes

Duration for attacking Two-Key Triple-DES Encryption using all RAM ever built?

cryptanalysis brute-force-attack asked Apr 26 '12 at 11:49
crypto.stackexchange.com

8 votes

How to construct a good PRF from a block cipher?

pseudo-random-function asked Nov 21 '12 at 9:49
crypto.stackexchange.com

8 votes

Do FP operations give EXACTLY the same result on various x86 CPUs?

x86 floating-accuracy asked Oct 27 '12 at 16:53
stackoverflow.com

7 votes

Odds of drawing at least k identical values among m after n draws?

r binomial multinomial asked Feb 8 '12 at 13:47
stats.stackexchange.com

6 votes

How much can we compress RSA public keys?

rsa key-size compression asked Jan 18 '12 at 22:52
crypto.stackexchange.com

6 votes

Attacks of the MAC construction $\mathcal{H}(m||k)$ for common hashes $\mathcal{H}$?

hash cryptanalysis mac asked May 23 '12 at 11:32
crypto.stackexchange.com

6 votes

Why does it matter for a signature scheme to be without random oracles?

signature random-oracle-model asked Jun 29 '12 at 13:26
crypto.stackexchange.com

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Top Answers
26
How big an RSA key is considered secure today?
crypto.stackexchange.com

15
Is digest=HASH(HASH(a)+HASH(b)) equivalent to publishing two digests?
crypto.stackexchange.com

14
Is it feasible to build an index of prime factors?
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13
Is this encryption algorithm build from MD5 secure?
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12
“SHA-256” vs “any 256 bits of SHA-512”, which is more secure?
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12
What is a smart card?
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11
Does RSA work for any message M?
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10
Time Capsule cryptography?
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10
Is every output of a hash function possible?
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10
Is SHA-1 still practical secure under specific scenarios?
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10
Why exactly is Blowfish faster than AES?
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9
Encrypting small values with RSA private key
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9
What is an efficient random number generation algorithm
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9
Is Wiener's attack on RSA extendable to larger keys with low hamming weight?
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9
Do MD5's weaknesses affect Oplop?
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9
How practical are side-channel attacks and how much of a concern are they?
crypto.stackexchange.com

9
A situation where security by obscurity might be the best solution - or am I wrong?
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9
Can we replace the XOR operation in DES with some other operation?
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9
CBC-MAC , fixed length, all blocks returned
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8
Impacts of not using RSA exponent of 65537
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8
PBKDF2 for key diversification
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7
Brute forcing CRC-32
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7
Can one implement AES on 4-bit microcontroller?
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7
Permutations of pseudorandom data
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7
Is a random length-extension worth the effort?
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7
Do Cryptographic Hashing Algorithms operate only on Integers?
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7
Does omitting the first two lines of RC4's pseudorandom generation algorithm weaken the cipher?
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7
Is this password migration strategy secure?
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7
creating a small number from a cryptographically secure random string
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7
Why is asymmetric cryptography bad for huge data?
crypto.stackexchange.com

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