标签: 跳码

一种宽带跳码通信系统设计及基带FPGA实现

引言基于密码的访问控制系统应用在当今是非常普遍的,但人们对其提供的安全等级经常估计过高.通信传输速度和系统计算能力的提高使得系统受到恶意攻击或"密码扫描"的风险增加.在使用不安全的传送方式时,可能发生密码被盗取的现象.例如典型的通过电话线的调制解调器连接,这种使用固定密码的方法很不理想.……

ThisapplicationnotedescribestheworkingofaKEELOQ®codehoppingdecoderimplementedonaMicrochipMidrangeMCUs(PIC16C6X,PIC16C7X,PIC16C62X)Thesoftwarecanbeusedtoimplementastandalonedecoderorbeintegratedwiththeuserapplication.ThedecodersupportstheMicrochip’sHCS200,HCS201,HCS300,HCS301,HCS360,andHCS361KEELOQhoppingcodeencoders.Thedecodersupportsnormalandsecurelearning.Twomanufactur-erscodesallowdifferentmanufacturerstoshareapub-lickey,butretaintheirownprivatekeys.AN672PICMCUMid-RangeCodeHoppingDecoderAuthor:VivienDelportFIGURE1:MICROCHIPMIDRANGEMicrochipTechnologyInc.DECODEROVERVIEWLRNIN118RFINThisapplicationnotedescribestheworkingofaLRNOUT217NCKEELOQcodehoppingdecoderimplementedonaNC316OSCINMicrochipMidrangeMCUs(PIC16C6X,PIC16C7X,……