data encryption

The Data Encryption Standard (DES,

•  is a previously predominant algorithm for the encryption of electronic data.
• It was highly influential in the advancement of modern cryptography in the academic world. Developed in the early 1970s at IBM and based on an earlier design by Horst Feistel, the algorithm was submitted to the National Bureau of Standards (NBS) following the agency's invitation to propose a candidate for the protection of sensitive, unclassified electronic government data. .
• DES is now considered to be insecure for many applications. This is chiefly due to the 56-bit key size being too small; 

 In recent years, the cipher has been superseded by the Advanced Encryption Standard (AES).

Advanced Encryption Standard (AES) is a specification for the encryption of electronic data.

• It has been adopted by the U.S. government and is now used worldwide.
•  It supersedes DES.^[3] The algorithm described by AES is a symmetric-key algorithm, meaning the same key is used for both encrypting and decrypting the data.
• Originally called Rijndael, the cipher was developed by two Belgian cryptographers, Joan Daemen and Vincent Rijmen, and submitted by them to the AES selection process.^[4] The name Rijndael (Dutch pronunciation: [ˈrɛindaːl]^[5]) is a play on the names of the two inventors.

• Key sizes	128, 192 or 256 bits