Written in C

Hard-code a string of your choice. Print out your string.

Generate a random key of chars the same length as your string. Print out the key.

Exclusive OR each character in your string with the corresponding character in the random key to generate ciphertext. Print the ciphertext.

Exclusive OR each character in the ciphertext with the corresponding character in the random key to generate the original text. Print out the original text.

Using:

Modulo arithmetic can be used to get random numbers in a specific range: rand() % (max + 1 min) + min