Caesar Cipher

The Caesar Cipher (also known as shift cipher) is a method of encrypting messages. In this cipher, the original message (plaintext) is replaced with a letter corresponding to the original letter shifted by N places according to the English alphabet. It is therefore a Substitution cipher where letter at ‘L th’ position is shifted to ‘L+N th’ position, where N is the same for all the letters.

Using this method, the original message that is understandable to any English speaking user, needs to be deciphered before arriving at context.

Example

This example uses a right shift of 3.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
| | | | | | | | | | | | | | | | | | | | | | | | | |
V V V V V V V V V V V V V V V V V V V V V V V V V V
D E F G H I J K L M N O P Q R S T U V W X Y Z A B C

Plain text:

I LOVE WORKING ON GITHUB

Cipher text:

L ORYH ZRUNLQJ RQ JLWKXE

Further Reading

Caesar Cipher

Fun Trivia:

This cipher is named after Julius Caesar, who used this in his private correspondence.