Cryptography. Data Encryption Standard (DES) implementation

The purpose of this article is an analysis of the main concepts related to the Data Encryption Standard (DES) algorithm and the discussion of two poss ible low cost implementations. One of them was tested sending messages via electronic mail. DES is a 64 bit block cipher for data protection. The algorithm provides a see of functions on 16 rounds which transform 64 bib of plaintext into 64 b its of ciphertext. The encrypting process uses a symmetric algorithm. The u sers select one of the 2(56) possible keys and can change It at any time. Two implementations of the DES's algorithm are described. The cryptographic mode selected was apr electronic codebook because, at least initially, it represented the easiest way to face the design. The software implementation was developed using C language The hardware implementation is based on Dig ital Signal Processing (DSP) technology.