Question: Suppose you use the following encryption algorithm to encrypt a plain text P with keys K 1 and K 2 to get the cipher text

Suppose you use the following encryption algorithm to encrypt a plain text P with keys K1 and K2 to get the cipher text C: C = E(D(E(P, K1), K2), K1). How will you obtain P from C?

1.

P=E(D(E(P, K2), K1), K2)
2.

P=D(E(D(P, K1), K2), K1)
3.

P=D(E(E(P, K1), K2), K1)
4.

P=D(E(D(P, K1), K1), K2)

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