Question: SupposethatX = ( x 1 , . . . , xn ) andX = ( x 1 , . . . , xn ) aretwosequencesofn

SupposethatX=(x1,...,xn)andX=(x1,...,xn)aretwosequencesofn plaintext blocks. Define same(X,X)= max{j : xi = xi for all i <= j}. Suppose X and X are encrypted in CBC or CFB mode using the same key and the same IV. Show that it is easy for an adversary to compute same(X, X)

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