@Misc{EFLRx99b,
  author = 	 { C[arl] Ellison and B[ill] Frantz and B[utler] Lampson and R[onald L.] Rivest and B[rian M.] Thomas and T[atu] Ylonen },
  title = 	 { SPKI Certificate Theory },
  date =         { 1999-09 },                  
  OPTyear = 	 { 1999},
  OPTmonth = 	 { September },
  howpublished = { Internet Network Working Group Request for Comments: RFC 2693 (September 1999). },
  abstract =     {
   The SPKI Working Group has developed a standard form for digital
   certificates whose main purpose is authorization rather than
   authentication.  These structures bind either names or explicit
   authorizations to keys or other objects.  The binding to a key can be
   directly to an explicit key, or indirectly through the hash of the
   key or a name for it.  The name and authorization structures can be
   used separately or together.  We use S-expressions as the standard
   format for these certificates and define a canonical form for those
   S-expressions.  As part of this development, a mechanism for deriving
   authorization decisions from a mixture of certificate types was
   developed and is presented in this document.
   This document gives the theory behind SPKI certificates and ACLs
   without going into technical detail about those structures or their
   uses.                  
                 },                  
}