8-bit blocks, and double-size key (i.e. 16-bit key) using two-s complete representation of negative numbers. Assume +^2^8 and XOR as the two operations.

K = 0000 0110 0000 0011

K^0= 0000 0110

K^1= 0000 0011

P = 1101 1010

1) perform the encryption operation of the given plaintext.

C = (P XOR K^0) +^2^8 K^1

2) show how to recover the original plaintext from the cipher text by performing decryption.

P = (C +^2^8 -K^1) XOR K^0