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May
4
comment Where can I learn the basics of AES?
How about A Stick Figure Guide to the Advanced Encryption Standard
May
4
comment PGP digital signature vs SHA256 HMAC Comparison
I'm not sure I understand your statement "...uses Lim-Lee primes and they don't provide the prime factorization. So you can't test that they are any good in practice." If you have the private key, you can easily factor. Then test the primes.
May
2
comment Is it a bad idea to use PGP encryption for structured/predictable data?
PGP should work just fine. It is meant to take any sort of data as input and securely encrypt it.
May
1
answered PGP digital signature vs SHA256 HMAC Comparison
Apr
30
comment Alice and Bob's crush
Impossible. If bob says "yes" and alice says "no" then they learn that their answers are not the same, so the other person's must be the opposite. So they know the other person's.
Apr
29
reviewed Approve Is it safe to derive two different keys with the same password and key derivation function using two different salts?
Apr
29
comment Key distribution and computation for homomorphic encryption
I just came across this paper: Ciphers for MPC and FHE
Apr
28
comment How to attack the Two Time Pad?
possible duplicate of this and this
Apr
28
comment How to attack the Two Time Pad?
@yamm, it also tells you that if you encrypt two 128 bit keys and the attacker is able to learn bits on one (say through a side channel attack), they know bits on the other. This is significant because say one key is used near the attacker (that is how they have access to the side channel) and the other key is used on the other side of the world. That said, security is all about tradeoffs, so this is nothing new. The real question is what do you really gain by doing this as opposed to some other method that does not have this "feature"?
Apr
27
comment Paillier cryptosystem preserve ordering of sums for two integer sequences
Okay, I figured you had the public key and the randomness mixed up.
Apr
26
comment Paillier cryptosystem preserve ordering of sums for two integer sequences
To do the homomorphic operation, all encryption must be with the same public key.
Apr
25
comment If you hashed a hash an infinite number of times would you end up with a unique hash?
No, because you would never stop hashing, so you would never end up with anything.
Apr
24
comment How to securely map an element from an smaller domain to the other element in a large domain
If the technique is public, what stops the adversary from running it herself?Typically the answer to that is a secret key, but you don't want to use secret keys. So, maybe there is no solution?
Apr
24
revised How to securely map an element from an smaller domain to the other element in a large domain
edited title
Apr
24
revised Prime factorization
added 25 characters in body
Apr
24
comment Prime factorization
Sounds like we have at least a few good answers here in the comments. Anyone care to write theirs up?
Apr
23
revised Common Modulus Attack in RSA
added 4 characters in body
Apr
23
answered Common Modulus Attack in RSA
Apr
23
revised Common Modulus Attack in RSA
added 2 characters in body
Apr
23
comment Why does second pre-image resistance imply pre-image resistance
I don't really agree with this answer, because to me, the identity function is not a hash function. Look at the definitions of hash function and cryptographic hash function on Wikipedia. I see problems with the identity function with relation to both of those definitions.