【作者】 杨卫国；

【导师】 陈桂芬；

【作者基本信息】 长春理工大学 ， 通信与信息系统， 2004， 硕士

【摘要】 本文概述了数据物理隔离技术及存储信息加密技术的发展过程。在深入研究了常见物理隔离技术实现方案中存在的各种问题后，提出了一种基于CPLD的全新实现方案；同时，对于存储信息的加密也进行了研究，详细阐述了基于移位寄存器的非线性组合序列密码的设计方法，提出了完整的设计流程，并设计了一个基于FPGA的非线性组合反馈序列密码芯片，该芯片能提供高质量的伪随机密钥流。经实验板测试表明，我们提出的物理隔离技术的实现方案能弥补现有一些系统的不足，如：各分区容量设置灵活，各分区间切换方便等。加密芯片经仿真测试表明：加密算法所生成的密钥序列具有良好的伪随机特性，并且对密钥的变化具有良好的扩散性和严格的雪崩特性(SAC)，也就是说，该算法能够产生高质量的伪随机密钥流。从而能提供很高的信息保护能力。更多还原

【Abstract】 In this thesis we genally describe the developing process of the technology of physical isolation and data encryption. After deeply studying all kinds of problems of current actualization methods, we put forward to a new actualization method of the technology of physical isolation on the base of CPLD. We make a lot of research on data encryption and describe the design method of the encryption chip on the base of LFSR (linear feedback shift register). After putting forward to the whole design procedure, we design an encryption chip on the base of LFSR, which can provide the high-quantity data stream of encrtption. Through testing the testing board, we conclude that the new actualization method has such advantages as setting randomly the capacity of a hard disk, translating the working disk conveniently and so on. By the mock test of the encryption chip, we make a conclusion that the encryption data stream which is generated by the chip has such advantages as good randomicity, good expandability in correspondence with change of password and SAC (strict avalanche criterion). That is to say, it can provide such a high-quantity data stream of encryption that we can improve the ability of data encryption.更多还原