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comment Implementation Attacks on Hashes
@RichieFrame hello! So should l look at cache timing attacks and side channel attacks? What literature is out there about this for hasing?
Aug
15
asked Implementation Attacks on Hashes
Dec
28
awarded  Student
Oct
13
comment Is SHA-256 a one way permutation when restricting the domain to {0,1}^256?
"This is why we can say with a good degree of confidence that no hash is a permutation." I disagree with that statement. Permutations that may appear to have a random output are quite feasible. Assuming what I stated before, the simplest that comes to mind is a generator of a galois field that was selected at random and kept secret to everyone. Is it cryptographic? no. do the outputs appear random? Well, if the generator was larger than $\sqrt{n}$ where $n$ was the size of the galois field, then you might be on to something that may appear random and is a permutation.
Oct
11
comment Is SHA-256 a one way permutation when restricting the domain to {0,1}^256?
The second answer is basically what I am looking for i.e."No. Cryptographic hash functions model a random function, not a random permutation. A significant fraction of output hash values are expected to be unreachable and another fraction have multiple preimages."
Oct
11
comment Is SHA-256 a one way permutation when restricting the domain to {0,1}^256?
I notice someone had asked something similar. It does not seem to be that case that anyone had said "yes" or "no" and "here is why...".
Oct
11
asked Is SHA-256 a one way permutation when restricting the domain to {0,1}^256?