介绍des加密以及解密的三片文章，是用FPGA实现的。能加深对des加密以及解密的原理的理解。对用FPGA来实现des加密以及解密有帮助。-Descr iption des encryption and decryption of the three articles is the use of FPGA implemented. Can deepen their understanding of des encryption and decryption of the principle of