Question: Suppose that we have an encryption scheme whose plaintext space is M = { m in { 0 , 1 } 2 n } and

Suppose that we have an encryption scheme whose plaintext space is M={m in
{0,1}2n} and whose key space is K={k in {0,1}n}. Suppose that Enck(m)= m (k||F (k))
where F is a secure length-preserving pseudorandom generator

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