caesar_cypher_algorithm

C program that implements the Caesar Cypher encryption and decryption algorithms

Caesar Cypher is an ancient encryption scheme that is based solely on the displacement of each character $x$ with its encrypted correspondant $x + n$, where $n$ is the key a.k.a. the number of positions to shift the character $x$.

Example:
Cyphertext: "gur creeva cntrf jvyy uryc lbh svaq lbhe pnyyvat ohg qbag or qhcrq phg qbja gur jbbqf gurl or reqbf"
Plaintext: "the perrin pages will help you find your calling but dont be duped cut down the woods they be erdos"
(from "Mr. Robot" (Season 2, Episode 11))