About this article
Published Online: Feb 02, 2013
Page range: 125 - 146
DOI: https://doi.org/10.2478/v10037-012-0016-y
This content is open access.
In this article we formalize DES (the Data Encryption Standard), that was the most widely used symmetric cryptosystem in the world. DES is a block cipher which was selected by the National Bureau of Standards as an official Federal Information Processing Standard for the United States in 1976 [15].