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OTP-PKCS #11

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

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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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