DES算法在VoIP系统中的嵌入式设计与实现

针对目前VoIP信息加密不足，介绍了在VoIP终端设备中植入基于DES算法的加解密模块的整体设计。论文分析了硬件实现加解密的优势，设计了加密模块的顶层结构及各个模块，重点介绍了加密算法各个子模块的设计，并用ModelSim对子模块进行了功能验证和仿真，最终在FPGA中嵌入式实现了加解密算法。仿真和实测表明，算法的实现占用的FPGA资源少，速度快，性能稳定。在终端实现对语音的加解密，必将因为其更好的安全性广泛的应用于VoIP系统中。

the embedded design and implementation of DES algorithm in VoIP system

Aiming at the current condition about the lack of VoIP message encryption,an overall design of encryption and decryption module which was based on DES algorithm and implanted in the VoIP terminal equipment was introduced.The advantage of hardware implementation of DES encryption and decryption is analysed,Design the top structure of the encryption module and each module,introduced the design of each submodule with the encryption algorithm,and do submodule’s functional verification and simulation through ModelSim,eventually the encryption and decryption algorithm were embedded realized in FPGA.The simulation and test show that the algorithm is realized in FPGA occupy less resources,speed,ang stable performance.The speech encryption and decryption in terminal,will be widely used in the VoIP systems are achieved because of its better safety.