Question: 1 1 . Suppose a public - key cryptosystem encrypts integers ( say , modulo another integer n ) . Show that if this scheme

11. Suppose a public-key cryptosystem encrypts integers (say, modulo another integer n). Show that if this scheme has the property that Dec(Enc(x) Enc(y))= x + y for any messages x, y, then the scheme is necessarily vulnerable to a CCA2 attack.

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