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EAP Archie draft-jwalker-eap-archie-00.txt

EAP Archie draft-jwalker-eap-archie-00.txt. Jesse Walker, Intel Corporation Russ Housley, Vigil Security. Background. Fact : IETF EAP WG has asked IEEE 802.11 TGi for guidance

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EAP Archie draft-jwalker-eap-archie-00.txt

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  1. EAP Archiedraft-jwalker-eap-archie-00.txt Jesse Walker, Intel Corporation Russ Housley, Vigil Security Walker & Housley

  2. Background • Fact: IETF EAP WG has asked IEEE 802.11 TGi for guidance • Observation: The mandatory-to-implement EAP authentication method (MD5 Challenge) is unsuitable for 802.11  This increases market confusion around security! • Question: Is there a suitable replacement algorithm? • Answer: Not really Walker & Housley

  3. Goals Design a candidate for a better EAP default: • Based on a long-lived pre-shared secret • Light weight; no public key operations • Mutual authentication • Prevent man-in-the-middle attacks • Protect against dictionary attacks if key is not weak • Guarantee a fresh session key Walker & Housley

  4. Request: AS-ID, SessionID Response: Hash1, STA-ID, SNonce, Binding, MIC1 Confirm: Hash2, ANonce, Binding, MIC2 Finish: Hash3, MIC3 The Archie Exchange AS STA PSK PSK Walker & Housley

  5. Next Steps Resolve: • Can MD5 Challenge be deprecated? Augmented? Delimited (so it is banned for wireless?) • Change to make EAP-Archie suitable for PPP? • Interest in evolving EAP-Archie into a standards track protocol? Walker & Housley

  6. Feedback? Walker & Housley

  7. Backup Walker & Housley

  8. Archie PRF Algorithm Archie-PRF Input: Key K, Label L, Nonce N, Output Length OL Output:OL-octet string Out Out = “” fori = 1 to (OL+15)/16 do Out = Out | AES-CBC-MAC(K, L | N | i | OL) return first OL octets out of Out Walker & Housley

  9. SK = Session Key = Archie-PRF(PSK, “Archie session key” | ASNonce | PeerNonce)  TLS Master Key Pairwise Key = Archie-PRF(SK, “Archie pairwise key” | BSSID | STA MAC Addr) PMK EAP Archie Key Hierarchy PSK = Long-lived Pre-Shared Key = KCK | KEK | KDK Walker & Housley

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