Question: What properties must a hash function ( H ) have to be useful for message authentication? For any given value h , it is computationally
What properties must a hash function H have to be useful for message authentication?
For any given value h it is computationally infeasible to find M such that HM h
For any given block M it is computationally infeasible to find yM with Hy HM
For any given block M it is computationally infeasible to find any pair M y of inputs such that HM Hy
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