Comment by ruined
19 days ago
hashes by definition are not reversible. you could store a timestamp together with a hash, and/or you could include a timestamp in the digested content, but the timestamp can’t be part of the hash.
19 days ago
hashes by definition are not reversible. you could store a timestamp together with a hash, and/or you could include a timestamp in the digested content, but the timestamp can’t be part of the hash.
> hashes by definition are not reversible.
Sure they are. You could generate every possible input, compute hash & compare with a given one.
Ok it might take infinite amount of compute (time/energy). But that's just a technicality, right?
Sure they are. You could generate every possible input
Depends entirely on what you mean by reversible. For every hash value, there are an infinite number of inputs that give that value. So while it is certainly possible to find some input that hashes to a given value, you cannot know which input I originally hashed to get that that value.
Oh, of course, the timestamp could instead be metadata!