文章针对当前主流的FPGA知识产权保护方法进行研究,重点讨论了直接加密法和鉴权法两种加密策略,并以Xilinx Virtex-5系列FPGA为背景,从安全性、应用需求及实用性三方面详细分析了各自的特点,最后使用Xilinx FPGA和专用加密芯片进行了实现和验证。验证结果表明本文实现的两种方法都能够有效保护FPGA设计,对FPGA知识产权保护方法的选用和实现具有一定的借鉴意义。 This article focuses on the current mainstream FPGA intellectual property protection methods, focusing on the direct encryption and authentication methods of two encryption, and Xilinx Virtex-5 series FPGA as the background, from the security, application requirements and practical aspects Detailed analysis of their respective characteristics, the final use of Xilinx FPGA and dedicated encryption chip was implemented and verified. The verification results show that the two methods in this paper can effectively protect the FPGA design and have some reference to the selection and implementation of FPGA intellectual property protection methods.