Please help.

For the above question, I did coding in python. But it is showing errors. Can you please help me understand where I made a mistake? Please correct the error.

This is the code I did.

(1 point) This question concerns block cipher modes. We will use a simple affine cipher, which can be expressed in C as follows. char cipher(unsigned char block, char key) \{ return (key+11block)%256; 3 Note that the block size is 8 bits, which is one byte (and one ASCII character). We will work with the fixed key 008. We now encrypt various plaintexts using modes for this cipher. In every case in which the mode requires an IV, the IV will be 0xAA. In the case of CTR mode, we use a (nonce counter) arrangement in which the nonce is the left 5 bits of 0xAA and the counter is a 3 bit counter that begins at 0 . In all of the problems given below, one character is one block. Each character of the plaintext should be regarded as its corresponding ASCII code. a) Encrypt the plaintext "brownish" using CTR mode. Please enter your answer in hex. (Please do not enter an 0x, as this has been done.) 0x