Data Encryption Standard
The Data Encryption Standard (DES) represents a secret key encryption scheme, which was officially selected as the Federal Information Processing Standard for the USA by the National Bureau of Standards (today National Institute of Standards and Technology - NIST) in 1976 (Davies & Price, 1989). Later it was distributed on the international level and enjoyed by a great number of people. It is based on 56-bit key, which today is regarded as not sufficient due to the fact that it can be rather easily cracked with the use of brute force (Schneier, 2004). There is also evidence that the cipher has certain ...
