(RFC 5877 published May 2010, subtype last updated May 2010)

Type name: application

Subtype name: pkix-attr-cert

Required parameters: None

Optional parameters: None

Encoding considerations: binary

Security considerations:
  An attribute certificate provides authorization information.  An
  attribute certificate is most often used in conjunction with a
  public key certificate [RFC5280], and the two certificates
  should use the same encoding of the distinguished name as
  described in the Security Considerations of this document.

Interoperability considerations:
  The media type will be used with HTTP to fetch attribute
  certificates.  Other uses may emerge in the future.

Published specification: RFC 5755

Applications that use this media type:
  The media type is used with a MIME-compliant transport to
  transfer an attribute certificate.  Attribute certificates
  convey authorization information, and they are most often used
  in conjunction with public key certificates as defined in
  [RFC5280].

Additional information:
  Magic number(s): None
  File extension(s): .ac
  Macintosh File Type Code(s): none

Person & email address to contact for further information:
  Russ Housley
  housley&vigilsec.com

Intended usage: COMMON

Restrictions on usage: none

Author:
  Russ Housley <housley&vigilsec.com>

Intended usage: COMMON

Change controller:
  The IESG <iesg&ietf.org>