4. Suppose that a plaintext of length 640 bits is enciphered using DES with one of...
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4. Suppose that a plaintext of length 640 bits is enciphered using DES with one of the encryption modes, yielding a ciphertext of length 640 bits. The ciphertext is then sent by radio to a receiver, who will decipher it. Now suppose that during transmission, bit 229 is complemented by radio interference. How many bits deciphered MAY be incorrect if the encryption mode is: a. ECB? b. CBC? c. OFB? d. CTR? e. CFB? Explain how you got each answer. 4. Suppose that a plaintext of length 640 bits is enciphered using DES with one of the encryption modes, yielding a ciphertext of length 640 bits. The ciphertext is then sent by radio to a receiver, who will decipher it. Now suppose that during transmission, bit 229 is complemented by radio interference. How many bits deciphered MAY be incorrect if the encryption mode is: a. ECB? b. CBC? c. OFB? d. CTR? e. CFB? Explain how you got each answer.
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Related Book For
Probability And Statistics For Engineering And The Sciences
ISBN: 9781305251809
9th Edition
Authors: Jay L. Devore
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