programming-challenges/challenges/caesar-cipher

caesar-cipher

Created by @Divlo on 21 October 2020.

Instructions

In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.

Example of the alphabet with a rotation by 3

Original alphabet   : ABCDEFGHIJKLMNOPQRSTUVWXYZ
Alphabet rotated +3 : DEFGHIJKLMNOPQRSTUVWXYZABC

Complete the solution function. It should return the encrypted string.

The function has the following parameter(s):

• string: a string in cleartext (everything uppercase)
• shift: an integer, the alphabet rotation factor

Source

• Wikipedia - Caesar cipher

Examples

See the input-output.json file for examples of input/output.