Network Working Group D. Cooper Request for Comments: 5280 NIST Obsoletes: 3280, 4325, 4630 S. Santesson Category: Standards Track Microsoft S. Farrell Trinity College Dublin S. Boeyen Entrust R. Housley Vigil Security W. Polk NIST May 2008 Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile Status of This Memo This document specifies an Internet stan