ABSTRACT
The Data Encryption Standard (DES) was developed in the early 1970s at IBM, and later, in 1977, the algorithm was submitted to the National Bureau of Standards (NBS) to be approved as Federal Information Processing Standard 46 (FIPS 46). With the consultation of the National Security Agency (NSA), the NBS accepted a slightly changed version of DES as FIPS 46 in the same year to provide security for the unclassified electronic data of the U.S. government. The data are encrypted using DES in 64-bit blocks, which are encrypted using a 56-bit symmetric key to provide confidentiality and privacy.
