Abstract: This paper presents a new security encryption model based on improved LFSR（Linear Feedback Shift Register），which combines the high flexibility and low cost of the shift register and the characteristics of the high-speed and reconfigurable performance of FPGA，thereby allowing the system to achieve the purpose of low-cost，real-time allocation algorithm and reorganization of security policy document.This paper elaborates on the model of improved linear feedback shift register encryption algorithm encryption theory，and then introduces the FPGA algorithms and Reconstructable technologies.Finally，with the diagram analysis about the encryption and the valuation of total function，it is proved the arithmetic has good cost advantage and reconfiguration ability as safe is assured.

摘要： 提出了一种改进的线性反馈移位寄存器结构的安全加密模型，利用移位寄存器的灵活性高和成本低的特点结合FPGA器件的高速度和可重构的性能，从而使系统达到低成本、可实时配置算法文件和重组安全策略的目的，并详细论述了该模型的改进后的线性反馈移位寄存器加密算法的加密原理，然后介绍了该算法的FPGA实现及可重构技术，最后，通过对改进算法的加密时序图的分析和总体性能的评估，证明了该算法在保证安全性能的基础上具有很好的成本优势和可重构性。