Question: There is nothing exclusively special about strings and XOR in OTP. We can get the same properties using integers mod n and addition mod n

There is nothing exclusively special about strings and XOR in OTP. We can get the same properties using integers mod n and addition mod n.
This problem considers a variant of one-time pad, in which the keys, plaintexts, and ci- phertexts are all elements of Zn instead of {0,1}\lambda .
(a) What is the decryption algorithm that corresponds to the following encryption algo- rithm?

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