Design and Implementation of Encrypted File System Based on FPGA

摘要

Data Encryption Standard (short for DES) algorithm is widely used in encryption design. By adopting DES algorithm,this paper aims to encrypt and decrypt data files based on FPGA. In this thesis, the author deeply analyzes DESalgorithm and the workflow, such as IP substitution, S-box substitution, P-box substitution and key substitution. Then byvirtue of an analysis on core technology of DES algorithm, DES algorithm is utilized to realize encryption anddecryption of data files, among which, the encryption and decryption processes of DES algorithm are basically the same,except for a small part. For example, when generating the key, the encryption algorithm cyclically moves to the left, butthe decryption algorithm cyclically moves to the right, etc. Since the encryption and decryption parties must use the samekey, DES algorithm is also a symmetric algorithm. This paper uses DES algorithm to implement data file encryption anddecryption based on FPGA.