Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
Bartleby Related Questions Icon

Related questions

Question
100%

Caesars Cypher in C programming language

How do you program an encryption and decryption for a Caesars Cypher that covers all the possible ASCII characters? In this there should be a shift over K = 5 but the example below is K = 3. This should result in actual character and not the control ASCII represenations.

For example:
>>> $ encrypt(I have a key)
N%mf{j%f%pj~
>>> $ encrypt(see me at 3)
xjj%rj%fy%8
>>> $ decrpyt(|jfw%ns%gqzj)
wear in blue

Assume that the text parsing method has been succesful and it's the encryption/decryption of the char array that needs to be factored.

Formula

Encryption -> C = E(k, P) = (P + k) (mod 26)

Decryption -> P = D(k, C) = (C - k) (mod 26)

Where k = 5

Expert Solution
Check Mark
Caesars Cypher

The Caesar cipher is a type of shift cipher. Shift ciphers work by using the modulo operator to encrypt and decrypt messages. A shift cipher has a key K that is an integer between 0 and 25.
To encrypt your message, enter your message in the plain text text box, specify a layer, and click Encrypt. To decrypt the message, enter it in the Ciphertext text box, specify the shift, and click Decrypt.
This kind of encryption aims to prevent an attacker who has a copy of the ciphertext but does not know the key from discovering the contents of the message. Since she only has 26 key choices, she can easily try all 26 keys one at a time until someone recovers the message. This type of attack is called a brute force attack.

Knowledge Booster
Background pattern image
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-engineering and related others by exploring similar questions and additional content below.
Similar questions
    Recommended textbooks for you
    Text book image
    Computer Networking: A Top-Down Approach (7th Edi...
    Computer Engineering
    ISBN:9780133594140
    Author:James Kurose, Keith Ross
    Publisher:PEARSON
    Text book image
    Computer Organization and Design MIPS Edition, Fi...
    Computer Engineering
    ISBN:9780124077263
    Author:David A. Patterson, John L. Hennessy
    Publisher:Elsevier Science
    Text book image
    Network+ Guide to Networks (MindTap Course List)
    Computer Engineering
    ISBN:9781337569330
    Author:Jill West, Tamara Dean, Jean Andrews
    Publisher:Cengage Learning
    Text book image
    Concepts of Database Management
    Computer Engineering
    ISBN:9781337093422
    Author:Joy L. Starks, Philip J. Pratt, Mary Z. Last
    Publisher:Cengage Learning
    Text book image
    Prelude to Programming
    Computer Engineering
    ISBN:9780133750423
    Author:VENIT, Stewart
    Publisher:Pearson Education
    Text book image
    Sc Business Data Communications and Networking, T...
    Computer Engineering
    ISBN:9781119368830
    Author:FITZGERALD
    Publisher:WILEY