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Dec
28
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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?