基于Simulink的序列密码仿真研究

提出了利用Simulink对序列密码编码系统仿真的方法。根据基于移位寄存器产生伪随机序列的原理，使用Simulink的存储器模块模拟移位寄存器，以此为基础加上逻辑运算、双路选择等模块建立密钥序列生成器的仿真模型，并使用子系统技术，建立信息加（解）密系统的仿真模型。还以3种基本的序列模型m序列、前馈序列和钟控序列为例，给出了密钥序列生成器以及序列密码加（解）密系统的仿真设计。

System Simulation of Stream Ciphers Based on Simulink

The simulating method by Simulink is proposed in this paper. According to the principles of generating pseudorandom sequences based on feedback shift register. Memory modules are used to simulate shift register. Moreover, modules such as Logical Operator and Switch are employed to construct the simulating models of key sequence generators. In addition, subsystem technology is adopted to design the encryption and decryption system simulating models. In this paper, m-sequence, feed-forward sequence and clock control sequence are taken as examples to introduce the design of key sequence generators simulating models. The applications in the teaching and research of stream ciphers show that the proposed method is visual and easy to use, which makes it useful in practicality.