Question
Let, E = (E, D) be a perfectly secure cipher defined over (K,M, C) where K = M. Let E 0 = (E 0 ,
Let, E = (E, D) be a perfectly secure cipher defined over (K,M, C) where K = M. Let E 0 = (E0 , D0 ) be a cipher where encryption is defined as E0 (k1,k2) (m) = (Ek1 (k2), Ek2 (m)). Show that E 0 is perfectly secure
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