A symmetric block encryption algorithm is shown below. 16-bit blocks of plaintext P are encrypted using a 32-bit key. Encryption is defined as: C= (P EX_OR Ko) + K1 Cis the ciphertext, K is the secret key, Ko is the leftmost 16 bits of K, K1 is the rightmost 16 bits of K, EX_OR is bitwise exclusive OR, and + is binary addition. a. The ciphertext C must be the same size as the plaintext P, that is, it must not be larger than 16 bits. How can this be achieved? b. Show the decryption equation. How will the encrypted message be decrypted?

A symmetric block encryption algorithm is shown below. 16-bit blocks of plaintext P are encrypted using a 32-bit key. Encryption is defined as: C= (P EX_OR Ko) + K1 Cis the ciphertext, K is the secret key, Ko is the leftmost 16 bits of K, K1 is the rightmost 16 bits of K, EX_OR is bitwise exclusive OR, and + is binary addition. a. The ciphertext C must be the same size as the plaintext P, that is, it must not be larger than 16 bits. How can this be achieved? b. Show the decryption equation. How will the encrypted message be decrypted?

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...

See similar textbooks

Related questions

Q: Let the input size of a block cipher be 16 bits and the block cipher is used in the electronic code…

A: Answer : The Electronic Code Book (ECB) mode uses simple substitution, making it one of the easiest…

Q: In an RSA system, the public key (n,e) of a given user is (323, 11). 1. What is the value of the…

A: 1. What is the value of the exponent in the private key(n,d) of the user? 2. Suppose you want to…

Q: Stream ciphers are malleable] Suppose that the message "Pay $1.00 to Bob" is encrypted using a…

A: Answer: I have given answered in the handwritten format in brief explanation

Q: In the RSA public-key encryption scheme, each user has a public key, e, and a private key, d.…

A: Lets see the solution in the next steps

Q: Let the input size of a block cipher be 16 bits and the block cipher is used in the electronic code…

A: Electronic Code Book (ECB) is a mode of operation for a block cipher, with the characteristic that…

Q: In a public key cryptosystem using RSA algorithm, user uses two prime numbers 5 and 7. He chooses 11…

A: Please refer to the following step for the complete solution of the problem above.

Q: Suppose we will use Advanced Encryption Standard (AES) to encrypt a block of plaintext and the known…

A: Introduction

Q: 6. In a Rivest, Shamir and Adleman (RSA) cryptosystem, a particular user uses two prime numbers P…

A: Given that, P=23 and Q=29 These two number P and Q are the prime numbers. In RSA algorithm, n= P*Q

Q: 1.In an RSA cryptosystem, a particular A uses two prime numbers p = 13 and q =17 to generate her…

Q: An encryption function is given as f(p) = (2p + 1) mod 26 where p is the position of the input…

A: As per Q n A guidelines, we are allowed to solve only 1 question, so solving Cryptography question.

Q: Bob uses the RSA cryptosystem to allow people to send him encrypted messages. He selects the…

A: Answer to the above question is in step2.

Q: Suppose Data Encryption Standard (DES) is used to encrypt the following 64-bit block of plaintext: 6…

A: (1) The plain text (hex 64bit): 63FAC0D0AAAAA34D9F793 The initial 64-bit key is:…