Additive Ciphers
J. Hicks Cipher Disk, London 1893
The additive cipher is one of the most simple ciphers.
It is one in which the letters of the alphabet are shifted a certain number but remain in the same order.
The number in which the alphabet is shifted is called a key. The link below is to an applet I created showing how an additive cipher works.
It is based off of a MOD26, where there are 26 letters in the alphabet.
Additive Crypto-Applet