Cryptography/Data Encryption Standard

The Data Encryption Standard (DES) algorithm uses a key to encrypt/decipher a 64 bit block data. It first divide the data in to 64 bit data and then adds the key to every 64 bit block while encription/deciphering. At the receivers end it asks for key to decript/cipher it.

The Feistel function (F function) of DES

DES has been replaced by Advanced Encryption Standard (AES) (Advanced Encryption Standard) as the National Security Agency's official "secure encryption" algorithm.

External Links

Federal Information Processing Standards (FIPS) Publication 46-3