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EAP-POTP The Protected One-Time Password EAP Method

EAP-POTP The Protected One-Time Password EAP Method. Magnus Nystrom, David Mitton RSA Security, Inc. Background. EAP-POTP is an EAP method designed for One-Time Password (OTP) tokens EAP-POTP offers; Strong user authentication Mutual authentication Protection of OTPs in transit

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EAP-POTP The Protected One-Time Password EAP Method

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  1. EAP-POTPThe Protected One-Time Password EAP Method Magnus Nystrom,David Mitton RSA Security, Inc. IETF 64, Vancouver, Canada

  2. Background • EAP-POTP is an EAP method designed for One-Time Password (OTP) tokens • EAP-POTP offers; • Strong user authentication • Mutual authentication • Protection of OTPs in transit • Establishment of key material • Fast session resumption • …capabilities that are missing from existing EAP methods used with OTP tokens IETF 64, Vancouver, Canada

  3. Objectives • End-to-end protection of OTP value • Provide key material for lower layers (MSK, EMSK) • Minimal initial configuration • Minimize number of roundtrips • No PKI requirements • But complements PEAP, TTLS, and other tunneling methods • Meet RFC 3748, RFC 4017 requirements as well as requirements in keying-08 • Support OTP “corner cases” such as • Next OTP • New PIN mode IETF 64, Vancouver, Canada

  4. Typical Deployment,Wireless Authentication IETF 64, Vancouver, Canada

  5. Method Specifics • Packet format builds on the use of TLVs • Similar to PEAP • “Hardens” OTPs to protect against eavesdroppers and MITMs • Extensible to various OTP types • Optional channel binding • Session Resumption mechanism For further information, see the presentation made to the EAP WG at IETF-62http://www.drizzle.com/~aboba/IETF62/eap/ietf62_eap_potp.ppt IETF 64, Vancouver, Canada

  6. A few Security Features • Freshness: each peer contributes a nonce • Channel binding: the client indicates the server it thinks it’s talking to • Protected Pin change • Protected results: Client confirmation exchange • Selection: Server realm ID in initial request IETF 64, Vancouver, Canada

  7. Some Recent Updates • Introduction of Protected TLV • To take advantage of established key material already in the EAP session itself • Essentially, the protected TLV wraps other TLVs and integrity-protects them • Session resumption defined for basic mode IETF 64, Vancouver, Canada

  8. Planned Updates & Current Status • Planned Updates • Protected ciphersuite negotiation • Use of dedicated session resumption key for session resumption (and not EMSK) • Status • Commercial implementations of protocol version 0 exist. Will work on distinguishing differences. • RSA willing to contribute the method to the EMU community if there is interest in adopting it as a standards-track work item IETF 64, Vancouver, Canada

  9. IPR • RSA offers a reciprocal royalty-free license under RAND to all implementers • For details, see http://tinyurl.com/cvrfs IETF 64, Vancouver, Canada

  10. Documents & Information • draft-nystrom-eap-potp-03.txt • Part of One-Time-Password Specifications http://www.rsasecurity.com/rsalabs/otps • CT-KIP: Cryptographic Token Key Initialization Protocol • OTP PKCS#11 Mechanisms • OTP CAPI – MS CryptoAPI OTP extensions • OTP WSS Token: WS-Security OTP Token format • OTP Validation Service: Web service for OTP validation • Mailing list: subscribe otps to majordomo@majordomo.rsasecurity.com • Archive available by sending get otps otps.05to the above email address IETF 64, Vancouver, Canada

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