• OATH Reference Architecture Version 2.0
• OATH Reference Architecture Version 1.0

• HOTP: An HMAC-Based OTP Algorithm (RFC 4226)
  TXT from IETF web site | Acrobat PDF

• OCRA - OATH Challenge/Response Algorithms Specification
  Version 7 draft from IETF web site
• TOTP - Time-based One-time Password Algorithm
  Version 0 from IETF web site

Provisioning

• IETF KeyProv Working Group
  - PSKC - Portable Symmetric Key Container
  - DSKPP - Dynamic Symmetric Key Provisioning Protocol.
  Link to KeyProv WG
• IETF Bulk Provisioning Protocol
  Version 1 draft from IETF web site | Acrobat PDF

Other

• OATH Thraud Specifications Page
• ThraudReport: How to Share Transaction Fraud (Thraud) Report Data
  Version 5 draft from IETF web site