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20054412()JournalofBeijingNormalUniversity(NaturalScience)Apr.2005Vol.41No.2(,100875,),,,.;;;TP3093(2001AA144130):20042092070(chaos),.,,.1990,Ott,GrebogiYork[1]OGY,.,PecoralCarrol[2],()(),Lyapunov,2;.,,.,,.0.12ÛX=F(t,X)ÛX=F(t,X),t,X,X.2X(t;t0,X0)X(t;t0,X0).t+,X(t;t0,X0)-X(t;t0,X0)0,ÛX=F(t,X)ÛX=F(t,X)2.:2n(),().Xd.,XrLyapunov,2.,2,,2,.0.2,,1990,.,,:()[324];[5].,[6].,[7],,,,.[8],[9].11.1,,,1(),2,.2:143,..,,.,K1,K2,K3,,KiI1,I2,I3,,Ii,,S1,S2,S3,,Si;,,:,,,K1,K2,K3,,Ki(0ji,Kj=Kj),[10].1.2NLogistic:xn+1(i)=(1-ai)f[xn(i)]+aif[xn(i-1)]i=1,2,,m;xn+1(i)=(1-i)f[xn(i)]+if[xn(i-1)]i=m+1,m+2,,N;Kn=[Int(xn(N)10v)]Mod2u;Sn=(Kn+In)Mod2u;xn(0)=Sn/2u;f(x)=4x(1-x).,Kn,In,Sn,,aii,Sn.,[10](1).11.3,,.,.:Vm=me-m(N-(m-1)/2),,,Lm(L=0.5),PmVm:Pm=Vm/Lm.0.88,=0.35,=7.810-5,N=30,m=4;Pm=10-35.,1cm2,.10000,1023a.,1015a,...,:144()41Jm=1Pm=1056.[11].22.1WindowsVisualC++.Windows2000.,,..,,(2).22,,,,;,.:;(),,,;.,,,,,,,,,.2.2,:1).,.,.2),.3)(,2,2),,,..4),,2,.5),,.,,.2:145,,,.3,,.11025Hz,8,22kBs-1()..Huffman,,.:,.(32),Win2000,P3,256M.2M.4[1]OttE,GrebogiC,YorkJA.Controllingchaos[J].PhyRevLett,1990,64:1196[2]PecoralLM,CarrolTL.Drivingsystemswithchaoticsignals[J].PhysRev,1991,A44(4):2374[3],.[J].,2003,25:42[4],.Standard[J].:,2003,33(9):90[5],.[J].,2003(8):1210[6],,.[J].,1999,22(3):12[7],.[J].,2002,28(2):37[8],.[J].,2003,14(5):991[9],.[J].,2002,31(5):407[10],,.[J].,2001,50(10):1856[11]HuGang,WangShihong,KuangJinyu.Chaossecurecommunicationsinalargecommunity[J].PhysRev,2002,E66(6):65202ANACTUALIZATIONOFSPATIOTEMPORALCHAOSCRYPTOGRAPHYSPEECHCOMMUNICATIONMEETINGSYSTEMWenXiaodongHuangRonghuaiHuGangYeWeipingGiDuoying(InformationScienceCollege,BeijingNormalUniversity,100875,Beijing,China)AbstractThesecurenetworkspeechreal2timecommunicationsystemcombinesboththecontrollablespatiotemporalchaosmethodandatraditionalcryptographymethodintoamulti2endmeetingmixedaudiomodel.Thissystemassuresthesafetyofinformationtransportandtheabilityformeetingattendeestospeakfreelyusingamixedaudiomethodandsendinginformationfromtheattendeesinencrypteddata.Keywordssecuritycommunication;spatiotemporalchaos;sequencecipher;speechcommunication