WirelessSec_Yuzawa05Oct2002
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1 2002/10/05 IP Mobility Wireless Network 802.1x ( ) 2002/11/18 0 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 2002/10/05 EBUG ftp.jp.freebsd.org netbsd 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 1
2 2002/10/05 1. IP Mobility LAN IEEE802.11Wireless Network 4. IEEE IEEE802.1x/I-D Radius EAP TYPE /10/05 LAN IP Mobility LAN PC LAN PDA Hot Spot Hot Zone IMT-2000 NTT FOMA ALL IP 4G IP Mobility Vertical Handover Mobile IPv IETF Internet ITS DSRC 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 3
3 2002/10/05 LAN Local Area Network LAN LAN Hand off 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 LAN IEEE Apple imac (Air Port) LAN (1999) Lucent LAN Intersil 2.4GHz 5GHz, 25GHz (SpeedNet, WIS) (NTT, Y!BB Mobile) (MIS) Yahoo! BB 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 5
4 2002/10/ b? LAN Office Apple Home Networking Home RF b Home RF (FHSS) b LAN Bluetooth LAN Bluetooth LAN Embedded 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 LAN NTT com LAN LAN IP Mobility Network Mobile Ad-hoc Network 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 7
5 2002/10/05 M (NTT ) Mzone (NTT ) (NTT-ME) LAN (NTT-BP) NTT, NTT-BP NTT-ME, am/pm JR MIS, Yahoo! BB Mobile Yahoo! Café,, /11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 Hot Spot Mobile Internet Service b ASTEL PHS PHS IP MIS Mobile IP LIN6 Packet Air, Air Broadband Communications 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 9
6 2002/10/05 FWA: xdsl, FTTH SpeedNet (IEEE FH) Wireless Internet Service (IEEE802.11b) NTT-ME SOMA Networks (2.6G OFDM 12Mbps) NTT Communications B FWA NTT 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 LAN LAN Non-PC Ultra Wide Band Software Defined Radio Cognitive Radio 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 11
7 2002/10/ /11/18 12 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 2002/10/05 Ubiquitous Networking IPv6 Perimeter Model( 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 13
8 2002/10/05 Perimeter Security Perimeter Model CodeRed Nimda Host Security 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 CodeRed IPv6, Ubiquitous Networking Host to Host Security Model 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 15
9 2002/10/ /11/18 16 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 2002/10/ LAN 7.IPv6 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 17
10 2002/10/05 LAN (War Driving) LAN HotSpot 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 LAN LAN, Internet IP LAN TCP/IP 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 19
11 2002/10/ Wireless Network 2002/11/18 20 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 2002/10/ Wireless Networks IEEE Wi-Fi (Wireless Fidelity) b Ethernet ether 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 21
12 2002/10/ Wireless Networks L2 GW V-LAN,L3 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 CSMA/CA CSMA (Carrier sense Multiple Access) STA STA CA (Collision Avoidance) CD (Collision detection) collision CA STA RTS CTS DATA ACK STA Other STA 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 23
13 2002/10/ WECA STA AP Client AP 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 TCP/IP Layer L5,6,7 Application SSL/TLS L4 TCP/UDP L3 IP IPsec L1, security 802.1x MAC Address TCP/IP WirelessLAN Security 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 25
14 2002/10/05 IEEE (d,e,f,h,q,x) (c,g,w) CSMA/CD Token Bus Token Ring Distributed Queue Dual Bus Wireless LAN Demand Priority IEEE Std Edition 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 IEEE IEEE802.11b 2.4GHz IEEE802.11g 2.4 GHz LAN (11Mbps) 2.4 GHz LAN (54Mbps) PHY IEEE802.11a 5GHz IEEE802.11h IEEE802.11d IEEE802.11c 5GHz LAN (50Mbps) MAC IEEE802.11e IEEE802.11f IEEE802.11i QoS 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 27
15 2002/10/05 IEEE b 11Mbps 2~3Mbps MHz GHz Bluetooth CCK DSSS 11Mbps 5M/11Mbps DSSS: (Direct Sequence Spread Spectrum ) 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 IEEE a 54Mbps 24 30Mbps GHz GHz OFDM /11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 29
16 2002/10/ a/11b NIC Service Set Identifier (SSID): Open or Shared Key Authentication : MAC Address Authentication : Wired Equivalent Privacy (WEP) PDA PIN 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 LAN WEP LAN PC 802.1x LAN 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 31
17 2002/10/05 Service Set Identifier (SSID) LAN 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 SSID ESS-ID ESS-ID ESS-ID ESS-ID trivial default ESS-ID 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 33
18 2002/10/ Association Negotiation 2 Shared Key Authentication Challeng WEP Open Authentication( AP 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/ Association Negotiation Man-in-the-middle-attack WEP XOR XOR 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 35
19 2002/10/ MAC MAC AP DS B C STA3 STA1 AP MAC address list IEEE802.1 STA D B C 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/ MAC Open Authentication / Shared Key Authentication WEP MAC 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 37
20 2002/10/05 Wired Equivalent Privacy (WEP) WEP 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 24bit IV Wired Equivalent Privacy (WEP) 40/104bit PRNG RC frame CRC32 ICV XOR PRNG: 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 39 Pseudo Random Number Generator IV: Initialization Vector ICV: Integrity Check Value FCS: Frame Check Sequence XOR: exclusive OR CRC: Cyclic Redundancy Checksum MAC: Media Access Control
21 2002/10/05 WEP 1. AP (WEP) 2. WEP bit 3. IV( ) 24bit WEP 60bit/128bit 4. 40bit/128bit RC4 5. CRC32 6. RC4 7. IV IV IV:Initialization Vector= RC4:Ron s Code 4 Ron Rivest 1 DES RSA Security SSL 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 WEP WEP UCB RC4 Algorism Stream Cipher key XOR IC CRC32 check sum Maryland Network Name SSID-MAC Un-authenticated DH Key Agreement Man-in-the-middle Attack WEP Scalability 802.1x, EAP-TLS 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 41
22 2002/10/ Security Security MAC RADIUS address UserID password (EAP,802.1x ESSID ANY ESSID ANY (STA),Frame capture AP beacon (AP) user User Session Session (EAP,802.1x) WEP IV(Initialization vector) IV(Initialization vector) bit (WEP2,802.1x) 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 dynamic secure roaming AP roaming ( ( ) ) Overhead Overhead deployment secure 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 43
23 2002/10/ i i(MAC Enhancements for Enhanced Security) Temporal Key Integrity Protocol (TKIP) WEP re-keying Message Integrity Code (MIC) WEP 16bytes 802.1X keying/rekeying Advanced Encryption Standard (AES) RC4-base WEP/WEP2 128bit Encryption of management frames re-key WEP dynamic Roaming and key hand-off Reuse 802.1X EAPOL-Key message 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/ x 2002/11/18 45 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc.
24 2002/10/05 Supplicant ( ) Authenticator (AP,Switch) 802.1x Authentication server (RADIUS) Supplicant PAE EAP over LAN Supplicant Access service Authenticator PAE EAP over RADIUS Authentication server Port unautenticate PORT MAC disable LAN PORT IEEE 802.1x - Port-Based Network Access Control LAN PAE: Port Access Entity 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/ x EAPOL 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 47
25 2002/10/05 EAP PPP EAP Octet RFC2284(PPP Extensible Authentication Protocol) numb er field EAP 1 Code (EAP type) 3 = Success 4 = Failure EAP type ( smart card, Kerberos, Public key, One time password etc.) 2 Identifie r EAP session 802.1x EAP EAP over LAN EAP over RADIUS PPP: Length Data description 1 = Request 2 = Response Header Packet Length Data EAP type EAP packet format Point to Point Protocol 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 EAP over LAN(EAPoL) Octect Supplicant PAE number 1-2 PAE Ethernet Type Authenticator PAE 3 Protocol Version EAP 4 Packet Type Session WEP Descriptor Format , n Pakcet Body Length Packet Body [0x03] PAE (Port Access Entity: ) Ethenet [0x888E] EAPoL [0x01] EAP-Packet: [0x00] EAP Body EAP EAPOL-Start [0x01] EAP EAPOL-Logoff [0x02] EAP EAPOL-Key [0x03] Body Key EAPOL-Encapsulated-ASF-Alert [0x04] SNMP EAP 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 49
26 2002/10/05 EAP over RADIUS Octect RADIUS EAP-Message(79) number Message-Authenticator(80) 1 Code RFC2869 RADIUS Extension) RADIUS(EAP RADIUS Proxy ) 2 Identifier 2 -n Authentic ator Attributes Authenticator value specific authentication 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc Length RAIUS type 1 Access-Request 2 Access-Accept 3 Access-Reject 4 Accounting-Request 5 Accounting-Response 11 Access-Challenge 12 Status-Server (experimental) 13 Status-Client (experimental) 255 Reserved Request,replies matching 4096byte RADIUS format 2002/10/ x Supplicant( ) Authenticator (AP) Authentication server Associate (SSID) (RADIUS) EAPoL-Start Access EAP-type EAP-Request/Identify EAP-Response/Identify EAP-Request(EAP-type) EAP-Response RADIUS-Access-Request RADIUS-Access-Challenge RADIUS-Access-Request EAP-Request EAP-Response EAP-Success EAPoL-Key(key) RADIUS-Access-Challenge RADIUS-Access-Request RADIUS-Access-Accept Access 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 51
27 2002/10/05 EAP-type ( ) ( ) EAP-MD5 EAP-TLS TLS(SSL) EAP-LEAP Cisco Radius EAP-TTLS TLS EAP-SKE Shared Key Exchange: PEAP Protected Extensible EAP-SRP Secure Remote Password Authentication Protocol: PPP EAP-TLS PPP EAP GSM EAP TLS EAP EAP-AKA EAP-SIM UMTS AKA EAP-MAKE Mutual Authentication Procotol: AKA UMTS SIM Diffie-Hellman PKI AKA GSM UMTS AKA GSM UMTS SIM (GSM Subscriber EAP-GSS Identification Module) 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 TLS(Transport Layer Security) Hello_request Client_hello Server_hello Certificate negociation Server_hello_ done Protocol version, session ID, Client_key _ Exchange Protocol version, session ID, Certificate_ Verify X.509.v3 Finished Hand Shake Protocol Server_key _ Exchange Ceritificate_ request RSA Diffie&Hellman Change_cipher_sp ec Hand Shake Protocol RFC2246(TLSver1.0) TLS(ver1.0) SSL(3.0) 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 53
28 2002/10/05 Client TLS negotiate Client_hello(Cipher Suites) Server_hello(Cipher Suites ) Server_Certificate SSL server Server_Key Exchange(Certificate ) Certificate_request Server_Hello_Done Client_Certificate Client_KeyExchange(premaster secret) Certifivate Verify( ) Change_Cipher Spec( ) Finished Change_Cipher Spec( ) Finished 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 EAP-TLS RFC2716(EAP TLS Authentication Protocol) EAP Identity/Success/Failure fragment reassembly AP (TLS Session ID) Client AP EAP-TLS 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 55
29 2002/10/05 TLS negoiation EAP-TLS 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 EAP-TTLS(Tunneled TLS) draft-ietf-pppext-eap-ttls-02 ( ) EAP Identity/Success/Failure fragment reassembly AP (TLS Session ID) AP EAP-TTLS TTLS-server Client TLS handshake TLS tunnel 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 57
30 2002/10/05 EAP-TTLS TLS Negotiation TLS Tunnel 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 PEAP(Protected EAP) draft-josefsson-pppext-eap-tls-eap-05( ) EAP Identity/Success/Failure tunnel fragment reassembly PEAP request/response Flag filed) AP (TLS Session ID) TLS PEAP TLS handshake TLS tunnel 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 59
31 2002/10/05 AP EAP pass TLS negotiation PEAP TLS Tunnel 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 PEAP key 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 61
32 2002/10/ /11/18 62 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 2002/10/05 IPsec VPN PO WE RFA ULT DA TA ALA RM L3 password VPN STA AP VPN 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 63
33 PW R OK W IC0 AC T/C H0 ACT /C H1 W IC 0 AC T/C H0 AC T/C H1 ET H AC T CO L 2002/10/05 SSH IPsec ssh tunnel passcode Spilit-tunnel 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 Web (captive portal) Authentication RADIUS, LDAP, passwd, Kerberos etc AP The Internet Access Control + WEB WEB SSL secure authentication 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 65
34 2002/10/05 APOP delegate SMTP-Auth SMTP over SSL sftp NAT-Traversal Firewall+NAT 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/ /11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 67
35 2002/10/ LAN 7. IPv6 P2P, 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/ /11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 69 Radius CA (CRL) DRM AAA
36 2002/10/05 LAN WEP + MAC 802.1x (EAP) L3 (VPN) 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 LAN 2.4GHz PCIMCA OS IP-GW BSD Linux :-) 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 71
37 IEEE /10/ /11/18 72 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 2002/10/05 IEEE (1) STA Wireless Medium AP: Association :STA AP BSS:basic service set BSA:BSS basic service area) BSSID BSS ID AP MAC address SS:BSS STA MAC service data unit Station Service) BSA BSA BSS BSS STA1 STA1 STA3 STA2 Ad hoc network SS STA2 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 73 AP Infrastructure network
38 2002/10/05 IEEE (2) DS:BSS Distribution System) DSS:BSS service Distribution System Service) ESS:DS BSA Extended Service Set) ESA:ESA Extended Service Area) ESSID:ESS Roaming: BSA STA3 Roaming STA3 ESS STA1 BSS1 BSS2 STA4 STA2 STA3 AP DSS AP DSS DS Extended Service Set 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc /10/05 STA frame Class 1 State1: Unautenticated Unassociated DeAuthentication frame Class 1&2 Class 1&2&3 Authentication Authentication Reassociation State2: Authenticated Unassociated State3: Authenticated Associated DeAuthentication Disassociaton STA Class 1 Class 2 Class 3 control managem ent managem ent control managem ent Data frameswith FC bits To DS fromds both false 2002/11/18 Copyright 2002 Tomoharu SATO/Internet Research Institue Inc. 75 data data RTS,CTS,ACK,CF-END,CF-END+ACK Proberequest/response,Beacon, Authentication,Deauthentication Data frameswith FC bits To DS fromds both false Association request/response Reassociation request/response, Disassociation PS-Poll Deauthentication
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