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This problem concerns the following mode of operation. ,, Consider the following substitution attack scenario. (1) Alice encrypts a message (x1,x2) consisting of two blocks,
This problem concerns the following mode of operation. ,, Consider the following substitution attack scenario. (1) Alice encrypts a message (x1,x2) consisting of two blocks, generates cipher text blocks (y1,y2), and sends to Bob. (2) Oscar has known a pair of plaintext and ciphertext (x1,y1). He intercepts (y1,y2), replaces y1 with y1 and sends (y1,y2) to Bob. (3) Bob receives (y1,y2). Would Bob's decryption result in (x1,x2) ? Show all your work
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