3DES Example
1 Input is 168 bit key and 64 bit Plain Text
2 Generate 3 keys 56 bits in length
3 Encrypt Using First Key and DES
4 Encrypt Using Second Key and DES*
5 Encrypt Using Third Key and DES
6 3DES Encrypted Cipher Text
* One commercial variation is to use Second Key to DECRYPT instead of ENCRYPT on this Step
Introduction to Encryption