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Security in 802.16e

Security in 802.16e. Outline. 802.16e Security Introduction 802.16e Network Architecture Security Architecture X.509 cerf. PKMv1 RSA Authentication PKMv2 RSA based Authentication EAP based Authentication Double EAP Authentication RSA and EAP Authentication.

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Security in 802.16e

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  1. Security in 802.16e

  2. Outline • 802.16e Security Introduction • 802.16e Network Architecture • Security Architecture • X.509 cerf. • PKMv1 • RSAAuthentication • PKMv2 • RSA based Authentication • EAPbased Authentication • Double EAP Authentication • RSA and EAP Authentication

  3. 802.16e Network Architecture

  4. 802.16e Network model

  5. Security Architecture • Encapsulation protocol • A set of supported cryptographic suites • The rules for applying those algorithms to a MAC PDU payload • Key management protocol • Providing the secure distribution of keying data from the BS to the SS • Authentication protocol • RSA authentication protocol • Extensible Authentica5555tion Protocol

  6. Supported Cryptographic suites in 802.16e DES: Data Encryption ; AES: Advanced Encryption Standard ; CBC: Cipher Block-Chaining; CTR: Counter ; ECB: Electronic Codebook

  7. Cryptographic technology

  8. X.509 certificate

  9. Private Key Management • PKMv1 • Use in 802.16d • Only support RSA authentication • Only BS can authenticate SS • PKMv2 • Support EAP authentication and RSA authentication • MBS (Multimedia Broadcast Services) • Key hierarchy • New cryptographic technology • BS has a certificate • BS and SS can authenticate each other

  10. PKMv1-Authentication and Authorization

  11. PKMv1: Re-authentication • Re-authentication 相較於開始的authentication少了傳送Authentication information 這個步驟 • 為了避免中斷SS和BS之間的服務或連線，SS會在key lifetime快到的時候傳送Authorization request過去,然後BS和SS會同時啟動新的AK

  12. PKMv1:TEK exchange BS Key Request [SS Certificate, SAID, HMAC-Digest] Key Reply • Encrypt TEK with SS’s public key [Key-Sequence-Number, SAID, TEK-Parameters, HMAC-Digest] Encrypted Data

  13. Key hierarchy • The PKMv2 defines hierarchy for keys • Pre-PAK (pre-Primary AK) yielded by the RSA-based authorization process • MSK yielded by the EAP based authentication process • MBSAK from which keys used to protect MBS traffic are derived.

  14. Key hierarchy (cont.)

  15. PKMv2: RSA-based Authentication BS Authentication Information [Cert(manufacturer)] Authorization Request [Cert(MS), Security-Capabilities, MSRandom(64bits),SAID] Authorization Reply [Cert(BS),pre-PAK,PAK-Lifetime,PAK-SeqNumber,MSRandom,SA-Descriptor(s), BSRandom] Authorization ACK

  16. PKMv2: RSA-based Authentication (cont.) • RSA based authentication • EIK|PAK <= Dot16KDF(pre-PAK,SS MAC address | BSID | ”EIK+PAK” , 320) • AK<= Dot16KDF(PAK,SS MAC address | BSID | PAK|”AK” ,160)

  17. PKMv2: EAP Authentication

  18. PKMv2: EAP Authentication • One level EAP based authentication • Using the authentication exchange message to get MSK (Master session key) • PMK<= truncate(MSK,160) • AK<=Dot16KDF(PMK,SS MAC Address | BSID | “AK”,160)

  19. PKMv2:Two level EAP Authentication • Step1: SS->BS: PKMv2_EAP_START (no attribute) SS<->BS: First round EAP conversation with PKMv2 EAP Transfer message without HMAC/CMAC Digest BS->SS:EAP_success BS->SS:EAP_complete [EAP payload|signedby EIK] • Step2: SS->BS:PKMv2_EAP_START signed by EIK BS->SS:PKMv2 Authenticated EAP [EAP- Identity/Request] SS<->BS:Second EAP conversation with PKMv2 Authenticated EAP message signed by EIK 當Step2successSS和BS可以generate AK from PMK1 and PMK2

  20. PKMv2 AK key derivation: Two level EAP-based

  21. PKMv2:Two level EAP Reauthentication • Step1: SS->BS: PKMv2 EAP Start signed by H/CMAC Key_U SS<->BS: EAP conversation with PKMv2 EAP Transfer message BS->SS: PKMv2 EAP Complete signed by AK • Step2:SS->BS: PKMv2 EAP Start signed by H/CMAC_Key_U SS<->BS: PKMv2 EAP Transfer signed by AK

  22. PKMv2 :RSA+EAP basedAuthentication • First round :execute RSA-based authorization • Second round:execute Double EAP mode

  23. PKMv2 AK key derivation:RSA+EAP based

  24. KEKand Message Authentication code generation

  25. KEKand Message Authentication code generation (cont.)

  26. PKMv2: SA-TEK 3-Way handshake

  27. Conclusion • Authentication & authorization • It improves single authentication to become mutual authentication between SS and BS • It reduces the possibility of fake BS attack • Data privacy • IEEE 802.16e add secure encryption standard such as AES-key-wraps. • Key exchange • Add new method to protect integrity and support MBS

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