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.
Caesars Cypher in C
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
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.
Trending now
This is a popular solution!
Step by step
Solved in 4 steps
