This question concerns block cipher modes. We will use a simple affine cipher, which can be expressed in Cas follows.char cipher(unsigned char block, char key){return (key+11*block)%256;}Note that the block size is 8 bits, which is one byte (and one ASCII character). We will work with the fixed key 0x08.We now encrypt various plaintexts using modes for this cipher. In every case in which the mode requires an IV, the IVwill be OXAA. In the case of CTR mode, we use a (nonce || counter) arrangement in which the nonce is the left 5 bits ofOXAA 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 "spider" using CTR mode. Please enter your answer in hex. (Please do **not** enter an 0x,as this has been done.)Oxb) Encrypt the plaintext "spelling" using ECB mode. Please enter your answer in hex.Oxc) Encrypt the plaintext "mealy" using CFB mode. Please enter your answer in hex.Oxd) Encrypt the plaintext "mottos" using CBC mode. Please enter your answer in hex.Oxe) Encrypt the plaintext "downward" using OFB mode. Please enter your answer in hex.Ox

INTRODUCTION: Programming is instructing a computer to do something for you with the help of a…

Answered: This question concerns block cipher…

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+11"block)%256; }

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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