Bob is arguing that if you use output feedback (OFB) mode twice in a row to encrypt a long message, M, using the same key each time, it will be more secure. Explain why Bob is wrong, no matter what encryption algorithm he is using for block encryption
What will be an ideal response?
Xor-ing the message M with the same pad twice will give the same message
M back again if you are using OFB, no matter what method you are using to encrypt the
blocks.
Computer Science & Information Technology
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Computer Science & Information Technology