Introduction - If you have any usage issues, please Google them yourself
DES/RSA/MD5
The implementation of symmetric cryptography
(1) familiar with the use of the corresponding DES encryption / decryption function, complete single DES encryption / decryption of a particular file (test-1.txt) in a single machine;
(2) for DES key features (8 bytes, 64 bits, which really works for 56 bits), the design of a secret key generation mechanism (i.e. using the session key is randomly generated temporary);