Question

What do you mean by second preimage resistance in the context of hash functions?
a. Except for few hash values H, it is difficult to find a message M such that the hash of M is H.
b. Given a message M1, it is difficult to find another message M2 such that the corresponding hash values are the same.
c. It is difficult to find two messages M1 and M2 such that their hash values are the same.
d. None of these.

Answer 1

option B is correct answer.

explanation : Acccording to second preimage resistance for a given message M1 , it is difficult to find out another message M2 such that H(M1) = H(M2) .

Answer 2

Answer:

By second preimage resistance in the context of hash functions, we mean - option b) Given a message M1, it is difficult to find another message M2 such that the corresponding hash values are the same.

A property of hash function that is infeasible computationally in order to get or find an input which is secondary and gives the same output as that of the input.

This is called second preimage resistance.