中文摘要：

手机的普及使得个人信息安全问题受到广泛关注，其中手机短信息的安全性尤为重要．本文致力于设计实现手机短信息加密与安全传输的硬件系统，采用混沌A5／1混合算法，提出一种基于现场可编程门阵列（FPGA）的手机短信息加密系统设计方案．使用由Logistic混沌序列做初始密钥而改进的A5／1混合算法作为加密算法，分析其伪随机性并证明圆周相关与线性相关的关系；采用SIM300模块设计实现手机功能，仿真普通手机短信息和加密短信息的传输；开发一套软件测试平台，可以在计算机上呈现硬件系统的测试结果．经测试表明，本文提出并实现的硬件系统可以加密手机短信息并保证其正常传输，从而提高了手机短信息的安全性．

英文摘要：

More and more people having cell phone, they must pay more attention to message security of their personal privacy, in which cell phone short message security is the most important. In this paper, we focus on designing an encryption hardware system of cell phone short message with chaos and A5/1 hybrid algorithm and realizes it on field programmable gate array. In the encrypted core, chaotic sequences of logistic map are used as initial keys of A5/1 algorithm for encrypting short messages, and in this paper we prove the relationship between linear correlation and circle correlation in the pseudo-randomness research of chaotic sequences serving as the initial keys. The SIM300 modules are used to realize cell phone functions, simulate short messages of common cell phone and the encrypte short messages after processing by our system by wireless transmitting through the base station. In addition, in this paper we design a software test platform, and it can show the results of this hardware system on computer. The test results indicate that the proposed system and its hardware implementation can encrypt/decrypt short messages and ensure their normal transmission, which can improve the security of short message and ensure its integrity and reliability during transmitting.