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OTP-PKCS #11

This document outlines the PKCS #11 specifications for One-Time Passwords (OTPs), detailing the general objects, attributes, and procedures for OTP retrieval and verification. It aims to support applications accessing OTP tokens in an interoperable manner, facilitating the development of OTP-consuming applications for vendors and enhancing user experience. Key components include defined OTP key types, mechanisms, and enhanced attributes for various OTP algorithms. The document is intended for review and finalization, with updates reflecting ongoing discussions in the field.

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OTP-PKCS #11

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  1. OTP-PKCS #11 Magnus Nyström, RSA Security 23 May 2005

  2. Objectives • Describes general PKCS #11 objects, attributes, and procedures for retrieval and verification of OTPs • Intended to meet the needs of applications wishing to access connected OTP tokens in an interoperable manner • Eases the task for vendors of OTP-consuming applications • Enables a better user experience

  3. Principles of Operation

  4. PKCS #11 OTP Objects • OTP key type with a defined set of new, common, attributes • OTP Format (Hex, Decimal, …) • OTP Length • PIN related: PIN Pad, Default PIN, … • Challenge/Counter/Time-based • Service Name (Identifier) • Common OTP mechanism object attributes • Minimum and Maximum OTP length • Note: Added since initial draft, based on mailing list discussions

  5. PKCS #11 OTP Functions • Retains existing v2.20 function set • General approach is to use C_Sign and C_Verify • Follows PKCS #11 HMAC approach

  6. PKCS #11 OTP Mechanisms • Defines five OTP mechanisms based on the foregoing • CKM_SECURID, CKM_SECURID_TRADITIONAL, CKM_SECURID_KEY_GEN, CKM_HOTP, CKM_HOTP_KEY_GEN • HOTP mechanisms added since initial draft • Defines additional key attributes for keys of type CKK_SECURID and CKK_HOTP • CKA_ACCEPT_{TIME, COUNTER} • CKA_TIME_INTERVAL/CKA_COUNTER_VALUE

  7. Current status • Agreement on mailing list on current design, content • Document stable since 3rd draft (April 1st) • Agreement also among workshop participants? • Final Draft published on May 11 • 30-day review, ending on June 9 • Intent is to publish v1.0 shortly thereafter • New mechanisms for other OTP algorithms can be added later on • Similar to how new mechanisms can be added to PKCS #11 in general • This document provides a framework – and defines some initial mechanisms using the framework

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