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1 0 . The DES block cipher uses a 5 6 - bit key to encrypt a plaintext message. ( a ) If an operation
The DES block cipher uses a bit key to encrypt a plaintext message.
a If an operation consists of randomly choosing a possible DES key and testing if it is correct, how many operations are required to guarantee that the cipher will be broken? points
b If each operation took seconds about nanoseconds approximately how many days would it take to perform this attack? points
c If this attack were performed in parallel on processors, approximately how many days would it take for one of the attacks to succeed? points
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