One time pad - Alchetron, The Free Social Encyclopedia

SOLVED:In this problem we discuss the security of performing one-time pad encryption twice: (a) Consider the following subroutine that models the result of applying one-time pad encryption with two independent keys: EAVESDROP' (m ∈{θ, 1}^λ) k1←{θ, 1}^λ k2←{0,1}^λ c:=k2⊕(k1⊕ m) return c Show that the output of this subroutine is uniformly distributed in {θ, 1}^λ. (b) What security is provided by performing one-time pad encryption twice with the same key?

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