The Caesar Cipher a simple encryption technique used since the time of Roman Empire, named after Julius Caesar. It is a type of substitution cipher in which each letter in the alphabet is shifted by a certain number of positions down the alphabet.
The Caesar Cipher is suitable for beginners to learn about encryption, but it is not secure against modern decryption methods such as a brute force attack.
For example, a shift value of 4 would change the plaintext message "SEE YOU TONIGHT" to the ciphertext message “WII CSY XSRMKLX”. To decrypt the message, the process is simply reversed.
On this interactive page, you'll be able to see how this cipher works, trying it out for yourself, helping you understand how encryption can be used to keep messages secret.
Shift Value: