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P15 gets XORed with

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P15 gets XORed with

(a) K3

(b) K14

(c) K1

(d) K6

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The correct answer is (c) K1

Explanation: XOR P1 with the key K1, XOR P2 with K2, and so on for all bits of the key (possibly up to P14). Repeatedly cycle through the key bits until the entire P-array has been XORed with key bits.
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