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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

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 a. ECB? b. CBC? c. OFB? d. CTR? e. CFB? Explain how you got each

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