4 Block cipher operation (9 points) Alice and Bob choose to use a 16-bit block cipher shown below to 16-bit block. encrypt every 16-bit block to another 16-bit input- 4 bits 4 bits 4 bits 4 bits 4 bits 4 bits 4 bits 4 bits 16-bit scrambler 16-bit output The substitution table, T, that works on every 4-bit sub-block is as follows: Plaintext CiphertextPlaintext Ciphertext 1000 0110 0010 1001 011 0001 0010 1001
