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Which is NOT a characteristic of a hash function in cryptography?
The hash function is reversible.
Once you hash something, you cannot unhash it.
The hash size is independent from the input's length.
Hashing two different inputs does not give the same output.
Hash functions are one-way (not reversible). The other three options are characteristics of a hash function. *** The answer says hash function is reversible ** Which is wrong, it should say either non-reversible or "once you hash something you cannot unhash it form the hash is the correct answer. The question is asking for what isn't a characteristic of a hash function all but the "hash function is reversible" are correct statements. >> EDIT: It is possible for two different inputs to produce the same hash, just saying. <<Of course it is. Problematic question
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