Question: Consider two DES keys: K1 = 11 22 33 44 55 66 77 88 AA BB CC DD EE FF FF FF K2 = 11

Consider two DES keys:

K1 = 11 22 33 44 55 66 77 88 AA BB CC DD EE FF FF FF

K2 = 11 22 33 44 55 66 77 88 11 22 33 44 55 66 77 88

One of the two keys enables fast decryption with the 1-DES cipher (a single application of 1-DES). Which one? Explain your answer.

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