Research And Implementation Of PPTP VPN Communication Data Decryption Scheme Based On Heterogeneous Platform

As a mature communication technology,VPN is used to establish a private network for communication encryption.Compared with the traditional leased DDN?Digital Data Network?line or Frame Relay communication mode,it saves expensive network communication and maintenance costs,so it is widely used in individuals and enterprises.However,due to the large amount of domestic VPN traffic and the confidentiality of its communication data,this has made it difficult for the Ministry of Industry and Information Technology to effectively supervise and identify it.Therefore,it is of great significance to implement an efficient VPN data decryption scheme.Data decryption is a job that requires a lot of computation.Traditional general purpose processor CPUs have difficult to meet its computing needs.Heterogeneous computing breaks through the performance bottleneck of the CPU by using different types of instruction sets and architecture computing units,thus effectively solving the problems of computing power,energy consumption and scalability.Therefore,heterogeneous computing is seen as the third era after the installation of single-core,multi-core processor computers.In view of this,this paper proposes a data decryption scheme based on heterogeneous platform by analyzing the authentication protocol and data encryption protocol used in PPTP VPN communication.The solution uses an optimized data decryption mode—VPN-DES mode,and implements an FPGA DES algorithm module based on multiple sets of full pipeline architectures.The VPN-DES mode enables PPTP VPN authentication and decrypts encrypted communication data,and reduces the password space that requires violent exhaustion to 2⁵⁶.The VPN-DES mode is designed with the FPGA+CPU of the heterogeneous platform full pipeline architecture.While giving full play to the advantages of FPGA high-performance computing and CPU management,it can also traverse the full password space in a limited time.Therefore,this solution has PPTP.VPN 100%data decryption rate.The experimental results show that compared with the CPU and CPU+GPU decryption design,the performance of the scheme is 12.8 times higher than that of the CPU+GPU,and is about 50,000 times higher than that of the CPU.