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PKCS #9 v2.0

PKCS #9 v2.0. Magnus Nyström RSA Laboratories PKCS Workshop, 1999. Background. Historically, PKCS #9 has specified selected attributes They have been used in PKCS #6, PKCS #7 and PKCS #10

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PKCS #9 v2.0

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  1. PKCS #9 v2.0 Magnus Nyström RSA Laboratories PKCS Workshop, 1999

  2. Background • Historically, PKCS #9 has specified selected attributes • They have been used in PKCS #6, PKCS #7 and PKCS #10 • With increasing popularity for LDAP-accessible directories, more attributes (and a supporting object class) were needed

  3. Overview of differences from v1: • Two new (auxiliary) object classes: • pkcsEntity • naturalPerson • New attributes for use with these classes (e.g. “pseudonym”) • Some other new attributes: • Random nonce • Sequence number

  4. Overview of differences, cont.. • Some older attributes have been updated (DirectoryString, internationalization) • “Compilable” ASN.1 module included • Collected undocumented OIDs and attributes defined elsewhere • BNF Schema summary included for easier integration in LDAP services

  5. The pkcsEntity object class • pkcsEntity OBJECT-CLASS ::= { SUBCLASS OF {top} KIND auxiliary MAY CONTAIN {PKCS9AttributeSet} ID pkcs-9-oc-pkcsEntity }

  6. The PKCS9AttributeSet • PKCS9AttributeSet ATTRIBUTE ::= { userPKCS12 | pKCS15Token | encryptedPrivateKeyInfo, …}

  7. The userPKCS12Attribute • Intended to store PKCS #12 PFX PDUs in directories • Multi-valued

  8. The pKCS15Token attribute • Intended for storage of PKCS #15 soft-tokens in directories (once such tokens are defined in PKCS #15…) • Multi-valued

  9. The encryptedPrivateKeyInfo attribute • Intended for storage of simple encrypted private keys in directories • Note: No (explicit) integrity check! • Multi-valued

  10. The naturalPerson object class • naturalPerson OBJECT-CLASS ::= { SUBCLASS OF {top} KIND auxiliary MAY CONTAIN {NaturalPersonAttributeSet} ID pkcs-9-oc-naturalPerson }

  11. The NaturalPersonAttributeSet • NaturalPersonAttributeSet ATTRIBUTE ::= { emailAddress | unstructuredName | unstructuredAddress | pseudonym | dateOfBirth | placeOfBirth | gender | countryOfCitizenship | countryOfResidence, …}

  12. The pseudonym attribute • Useful attribute in distinguished names for anonymous (at least in some sense) certificates • Intended to be used in IETF’s qualified certificates • Multi-valued (?)

  13. The dateOfBirth attribute • Specifies the date of birth • Intended to be used in IETF’s qualified certificates • Single-valued...

  14. The placeOfBirth attribute • DirectoryString • Intended to be used in IETF’s qualified certificates • Single-valued...

  15. The gender attribute • Printable string (‘M’ or ‘F’) • Intended to be used in IETF’s qualified certificates • Single-valued

  16. The countryOfCitizenship and countryOfResidence attributes • Printable strings (ISO 3166) • Intended to be used in IETF’s qualified certificates • Multi-valued

  17. Other new attributes • randomNonce: For use in conjunction with signatures to prevent replay attacks. Especially when no signingTime is available. • sequenceNumber: For the same use. Similar to numbering your checks.

  18. Modified (extended) old attributes • unstructuredName, unstructuredAddress, challengePassword, signingDescription: Syntax now extended to allow internationalization (implementations SHOULD use old syntax if possible) • signingTime: updated to be in accordance with S/MIME

  19. Time schedule • If you have any comments - please give them on or before October 25th. • Expect third draft early in November, for a short (2 w) review period (unless major changes) • v2.0 to be published in late November /early December 1999.

  20. Comments & Suggestions • Please send comments to • pkcs-tng@rsasecurity.com or • pkcs-editor@rsasecurity.com

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