Updates to the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile
draft-ietf-pkix-rfc5280-clarifications-04

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Last updated 2012-03-12
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INTERNET-DRAFT                                                 D. Cooper
Intended Status: Proposed Standard                                  NIST
Updates: 5280 (if approved)                               March 12, 2012
Expires: September 13, 2012                                             

        Updates to the Internet X.509 Public Key Infrastructure
       Certificate and Certificate Revocation List (CRL) Profile 
            <draft-ietf-pkix-rfc5280-clarifications-04.txt>

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Abstract

   This document updates RFC 5280, the Internet X.509 Public Key
   Infrastructure Certificate and Certificate Revocation List (CRL)
   Profile.  This document changes the set of acceptable encoding
   methods for the explicitText field of the user notice policy
   qualifier and clarifies the rules for converting internationalized
   domain name labels to ASCII.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Update to RFC 5280, Section 3.2: Certification Paths and
       Trust  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Update to RFC 5280, Section 4.2.1.4: Certificate Policies  . .  3
   4.  Update to RFC 5280, Section 6.2: Using the Path Validation
       Algorithm  . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   5.  Update to RFC 5280, Section 7.3: Internationalized Domain 
       Names in Distinguished Names . . . . . . . . . . . . . . . . .  5
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . .  6
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  7
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     8.1.  Normative References . . . . . . . . . . . . . . . . . . .  7
     8.2.  Informative References . . . . . . . . . . . . . . . . . .  7
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . .  7

1.  Introduction

   This document updates the Internet X.509 Public Key Infrastructure
   Certificate and Certificate Revocation List (CRL) Profile [RFC5280].

   The ASN.1 [X.680] syntax for the user notice certificate policy
   qualifier allows for the explicitText field to be encoded using one
   of four possible encoding methods: IA5String, VisibleString,
   BMPString, or UTF8String.  RFC 5280 permits certification authorities
   (CA) to encode strings in the explicitText field as either UTF8String
   or IA5String while forbidding the use of VisibleString and BMPString.
   However, after RFC 5280 was published, an examination of existing
   certificates found that the VisibleString encoding was commonly used.
   This document brings the requirements into closer alignment with
   existing practice by stating that the explicitText field may be
   encoded in either UTF8String, VisibleString, or BMPString while
   forbidding the use of IA5String.

   Section 7.3 of RFC 5280 specifies rules for converting
 

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