Mobile Phone SIM Card SWP Protocol Analysis System Design And Implementation

In recent years,with the rapid development of mobile payment,NFC technology has rapidly become a hot spot in the mobile payment industry by virtue of its security,convenience and other advantages,and mobile quick pass has become a new trend of consumption.At present,the nfc-swp scheme mainly promoted by telecom operators at home and abroad is the swp-sim card scheme,which has become the mainstream of mobile quick pass payment in the mobile payment industry.The SWP protocol analysis system based on swp-sim card proposed in this paper has the ability to capture and analyze the MAC layer data of SWP protocol,which can assist researchers to solve various card compatibility problems in the commercial process of swp-sim card.First of all,this paper describes the development of NFC mobile payment and the current situation at home and abroad,as well as the development background and application significance of SIM card SWP protocol analysis system.This paper introduces the composition of SIM card SWP protocol analysis system,which is divided into three parts:hardware design,software design and system test.Secondly,describe the hardware design of the SIM card SWP protocol analysis system,SWP protocol analysis hardware consists of signal sampling unit,signal conditioning unit,signal isolation unit,signal sampling unit and data sending unit and high capture rate and the original SWP MAC layer protocol S1,S2 data and convert them into digital signals and then transmitted to PC via USB.According to design requirements,complete the hardware architecture design,component selection,PCB circuit design and communication protocol logic design.Thirdly,the software design of the SIM card SWP protocol analysis system is described.SWP protocol analysis software consists of four modules:data reception,data parsing,data display and data storage.It is used to process the data sent from the hardware platform and realize the functions of receiving,analyzing,displaying and storing the data of S1 and S2.According to the above requirements,complete software interface design,software interface function design,data receiving thread process design,data parsing thread process design,data storage thread program design.Finally,the hardware and software testing of the SIM card SWP protocol analysis system is describe.Configure the test environment as required,and use NFC phones,dual-interface CARDS and test scripts to complete system interconnection,The data parsing capability of the SWP protocol analysis software is verified in both synchronous and asynchronous modes through system tuning.In addition,software compatibility has been verified on mainstream PC systems.