Let F be a secure block cipher. Show how to find a collision in the H(k, m1||m2||m3) = c3 where ci = F (k, mi ⊕ ci−1) for i ∈ {2, 3} and c1 = F (k, m1). Here we are interpreting k as the salt.

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Q: Show how Alice computes hash(2ab mod p, 2bW mod p) in Protocol 12-3.

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