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Suppose that (E ,D) is a perfectly secure cipher defined over (K,M, C) where K = M. Let (E ' , D ') be a
Suppose that (E ,D) is a perfectly secure cipher defined over (K,M, C) where K = M. Let (E ' , D ') be a cipher, where E'((k1, k 2 ), m)=(E(k 1,k 2 ), E(k 2,m)) . Show what D' has to be, and prove that (E ' , D ') is perfectly secure.
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