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1.OSIOSI2.DDOSDDoSDoSC/SDoSRDoS3.SSLSSL(1):SSL,(2):SSL(HASH),,,(3):,(),SSL,4.1:IPDHCPPINGDHCPIP2.DNSDNS11SYNSmurf2()34ARP2PKSKPKSKPKSKPKSKPKPKSKPKSK3(VPN)451.TCPSYN2.COOKIESYN671.2.3.81.2.IP(=64KB)TCP3.1DoSDenialofserviceDoS2CACACACACACA3SSLSSLSecureSocketLayer()/SSLTCPSSL45(1)(2)(3)(4)(5)5EDI6ARPARPARP(1)ABMACBIPARP(2)ARPIPIPBARPMAC(3)ABARPIP-MACARPARPARPIPMACARPARPARP7IPDHCPIP8CPU91231011TCPTCPSYNTCPSYNTCPSYNSYN+ACKTCPACKACKTCPTCPTCP12CACACACACA12MD1.3CA4CACA5CAMD2.6MD1MD2CA1.1.IPIPIPLANIPWANIPNATNATNATNATHTTPNATPCWab1.1.1.100--256kbps,512kbps.--NATNAThttp_limitPCWeb65kb/s520kb/s512kbps2.2.1ntbackup231.2.3.4.5.DDoSSYN/ICMP6.7.8.TCP/IP9.Sniffer10.(1)(2)(3)(4)(5)ping11.12.IPSIPSIPSHIPS)(NIPS)AIPHIPSNIPSNIPSAIPNIPSIPS13.1151.UNIX/LINUXWindows//2000/2003/2007dosIP2.IDSDMZDC3.TROJIAREMOVERQQMSN4.UTMUTMTCP/IPUTMVPNUTMHTTPMailUTMUTMVoIPH.323SIPIMP2PUTMUTMUTM5.30%TCP/IPOSITCP/IPOSIDoSDenialofserviceDoSCACACACACACASSLSSLSecureSocketLayer()/SSLTCPSSL5(1)(2)(3)(4)(5)EDI20ARPARP10(1)ABMACBIPARP(2)ARPIPIPBARPMAC(3)ABARPIP-MACARPARPARPIPMACARPARPARP10IPDHCPIP*1.2.123451238SupervisorReadWriteCreateEraseModifyFileScanAccesscontrol456782-4#3.DES?DESKeyData64Mode?164IPL0,R0216Li=Ri-1Ri=Li-1f(Ri-1,Ki)K1K2K1648key643R16,L16IP-164#4.RSA?AMB?1Bpq?2Bn=pq?3Be(n)ep-1)q-1,1?4Bd()d?ed-1p-1)q-1?5Bnen,d?AneM?C()=Me(modn)?BM=Cd(modn)#5.???*6.?*7.?????#8.(1KDC2CACertificateAuthorityPGPintroduder)#9.(E-mailWeb?#10.?(?#11.(*12.(56#13.()#14.(KK12ScriptActiveXAsp3?*15.DoS(12#16.(#17.(*18.(712#19.Web(#20.((10201#1.(2.2.3#3.#4.#5.DESRSA?DESKeyData64Mode?164IPL0,R0216i=Ri-1Ri=Li-1f(Ri-1,Ki)K1K2K1648key643R16,L16IP-164?AMB?1Bpq?2Bn=pq?3Be(n)ep-1)q-1,1?4Bd()d?ed-1p-1)q-1?5Bnen,d?AneM?C()=Me(modn)?BM=Cd(modn)6.#467..7#8.()812#9.E-mailISp#10.

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