Assume the Cipher-Block Chaining mode is used with a block cipher. The initialization vector is 1010 0101 1100 0011. The plaintext to be encrypted is ASSIGNMENT#7. The block cipher is using 2-byte (16 bits) blocks with ASCII encoding.

[a] What is the binary input to the encryption algorithm for the first block?

[b] If the ciphertext for first block is 0001 1110 1010 1100, what is the binary input to the encryption algorithm for the second block?