BANK IBPS SO Mock Test (Pre + Mains) 2024 Computer Networks Network Security

Let P be the plaintext, k be the key, E_k be the function to encrypt the plaintext and D_kbe the function to decrypt the ciphertext. What is valid function to get the plain text?

1

E_k(P)

2

D_k(P)

3

D_k(E_k(P))

4

E_k(D_k(P))

5

None of these

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