QUESTION 1 In block cipher required where each 64-bit block is encrypted and decrypted independently OCBC cipher block chaining O ECB electronic Codebook O Cipher feedback O Output feedback Which from the following is describe Cipher Block Chaining Mode CBC, where is Pj and Pj-1 are plaintext and previous plaintext, and Cj and Cj-1 ciphertext and previous cipher text, K is a key and E encryption function O Cj = E(K, [Cj-1 XOR Pj]) O Cj = E(K, Pj) O Cj = Pj_E(K, [Cj-1 XOR Pj-1]) O None of above