This is verilog source code for DES(Data Encryption standard) which is used in network security.

设计一个具有较高安全性和较低成本的通用电子密码锁，其具体功能要求如下：(1) 数码输入：每按下一个数字键，就输入一个数值，并在显示器上的最右方显示出该数值，同时将先前输入的数据依序左移一个数字位置。(2) 数码清除：按下此键可清除前面所有的输入值，清除成为“0000”。(3) 密码更改：按下此键时会将目前的数字设定成新的密码。(4) 激活电锁：按下此键可将密码锁上锁。(5) 解除电锁：按下此键会检查输入的密码是否正确，密码正确即开锁。 -Design of a high security

This project presents FPGA implementations of the DES and Triple-DES with improved security against power analysis attacks. The proposed designs use Boolean masking, a previously introduced technique to protect smart card implementations from these