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Обзор требований стандарта сертификатов x.509Стандарт x.509
Документы RFC
rfc765 протокол ФТП
rfc854 протокол ТЕЛНЕТ
rfc1035 доменные имена
rfc1321 алгоритм MD5
rfc1945 протокол HTTP/1.0
rfc2119 ключевые слова
rfc2246 TLS протокол v.1.0
rfc2246* TLS протокол v.1 new
rfc2437 спецификация RSA 2.0
rfc2459 x.509 профиль CRL
rfc2511 x.509 форма запроса
rfc2527 x.509 принципы
rfc2549 стандарт IP
rfc2560 x.509 - OCSP
rfc2585 x.509 FTP HTTP
rfc2616 протокол HTTP / 1.1
rfc2822 формат email
rfc2986 Спецификация CSR
rfc3029 x.509 протокол данных
rfc3161 x.509 метка времени
rfc3279 x.509 профиль CRL
rfc3280 x.509 профиль CRL*
rfc3281 атрибуты сертификата
rfc3443 процесс TTL
rfc3447 спецификация RSA 2.1
rfc3546 расширения TLS
rfc3597 обработка DNS RR
rfc3647 x.509 полис*
rfc3709 x.509 логотипы
rfc3739 x.509 профиль*
rfc3779 x.509 IP и AS
rfc4043 x.509 идентификатор
rfc4051 XML URI
rfc4055 x.509 RSA
rfc4059 x.509 гарантии
rfc4158 x.509 цепь доверия
rfc4210 x.509 протокол CMP
rfc4211 x.509 запрос*
rfc4212 x.509 CRMF PKIX
rfc4262 x.509 s/mime
rfc4325 x.509 профиль CRL**
rfc4346 TLS протокол v.1.1
rfc4366 TLS протокол v.1.1*
rfc4523 x.509 протокол LDAP
rfc5019 SMTP для особых сред
rfc5070 Обмена данными
rfc5246 TLS протокол 1.2
rfc5280 x.509 профиль CRL
rfc5480 ECC криптография
rfc5698 DSSC структура
rfc5741 RFC информация
rfc5750 s/mime v.3.2
rfc6066 TLS протокол
rfc6101 SSL протокол v.3.0
rfc6394 DNS DANE
rfc6454 Концепция Web Origin
rfc6455 WebSocket протокол
rfc6520 DTLS расширения TLS
rfc6546 RID HTTP/TLS
rfc6698 TLSA и DNS DANE
rfc6797 HSTS протокол
rfc6844 CAA DNS записи
rfc6960 OCSP статус
rfc6962 Прозрачность
rfc7489 DMARC
rfc8446 TLS 1.3

x.509 Инфраструктура открытого ключа Постоянный идентификатор


Статус этой заметки

   В этом документе указан протокол отслеживания стандартов Интернета для
   Интернет-сообщества, а также просит обсудить и
   улучшения. Пожалуйста, обратитесь к текущему изданию «Интернет
   Официальные стандарты протокола "(STD 1) для состояния стандартизации
   и статус этого протокола. Распространение этой заметки неограниченно.

Абстрактные

   В этом документе определяется новая форма имени, называемая постоянным
   идентификатор, который может быть включен в расширение subjectAltName
   сертификат открытого ключа, выданный предприятию.

   Постоянный идентификатор является необязательной функцией, которая может использоваться
   CA, чтобы указать, что два или более сертификата относятся к одному и тому же
   субъект, даже если они содержат другое имя субъекта (DN) или
   разные имена в расширении subjectAltName, или если имя или
   принадлежность этого объекта, хранящегося в субъекте или другом имени
   форма в расширении subjectAltName изменилась.

   Имя предмета, помещенное в поле темы, уникально только для
   каждый субъект, сертифицированный одним ЦС, определенным эмитентом
   имя поля. Однако новая форма имени может содержать имя, которое
   уникально для каждого субъекта, сертифицированного ЦС.

=====================================

Network Working Group                                          D. Pinkas
Request for Comments: 4043                                          Bull
Category: Standards Track                                      T. Gindin
                                                                     IBM
                                                                May 2005


                Internet X.509 Public Key Infrastructure
                          Permanent Identifier

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This document defines a new form of name, called permanent
   identifier, that may be included in the subjectAltName extension of a
   public key certificate issued to an entity.

   The permanent identifier is an optional feature that may be used by a
   CA to indicate that two or more certificates relate to the same
   entity, even if they contain different subject name (DNs) or
   different names in the subjectAltName extension, or if the name or
   the affiliation of that entity stored in the subject or another name
   form in the subjectAltName extension has changed.

   The subject name, carried in the subject field, is only unique for
   each subject entity certified by the one CA as defined by the issuer
   name field.  However, the new name form can carry a name that is
   unique for each subject entity certified by a CA.












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Table of Contents

   1.  Introduction..................................................  2
   2.  Definition of a Permanent Identifier..........................  3
   3.  IANA Considerations...........................................  6
   4.  Security Considerations.......................................  6
   5.  References....................................................  7
       5.1.  Normative References....................................  7
       5.2.  Informative References..................................  8
   Appendix A. ASN.1 Syntax..........................................  9
       A.1.  1988 ASN.1 Module.......................................  9
       A.2.  1993 ASN.1 Module....................................... 10
   Appendix B. OID's for organizations............................... 11
       B.1.  Using IANA (Internet Assigned Numbers Authority)........ 11
       B.2.  Using an ISO Member Body................................ 12
       B.3.  Using an ICD (International Code Designator) From
             British Standards Institution to Specify a New or
             an Existing Identification Scheme....................... 12
   Authors' Addresses................................................ 14
   Full Copyright Statement.......................................... 15

1.  Introduction

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

   This specification is based on [RFC3280], which defines underlying
   certificate formats and semantics needed for a full implementation of
   this standard.

   The subject field of a public key certificate identifies the entity
   associated with the public key stored in the subject public key
   field.  Names and identities of a subject may be carried in the
   subject field and/or the subjectAltName extension.  Where subject
   field is non-empty, it MUST contain an X.500 distinguished name (DN).
   The DN MUST be unique for each subject entity certified by a single
   CA as defined by the issuer name field.

   The subject name changes whenever any of the components of that name
   gets changed.  There are several reasons for such a change to happen.

      For employees of a company or organization, the person may get a
      different position within the same company and thus will move from
      one organization unit to another one.  Including the organization
      unit in the name may however be very useful to allow the relying
      parties (RP's) using that certificate to identify the right
      individual.



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      For citizens, an individual may change their name by legal
      processes, especially as a result of marriage.

      Any certificate subject identified by geographical location may
      relocate and change at least some of the location attributes
      (e.g., country name, state or province, locality, or street).

   A permanent identifier consists of an identifier value assigned
   within a given naming space by the organization which is
   authoritative for that naming space.  The organization assigning the
   identifier value may be the CA that has issued the certificate or a
   different organization called an Assigner Authority.

   An Assigner Authority may be a government, a government agency, a
   corporation, or any other sort of organization.  It MUST have a
   unique identifier to distinguish it from any other such authority.
   In this standard, that identifier MUST be an object identifier.

   A permanent identifier may be useful in three contexts: access
   control, non-repudiation and audit records.

      For access control, the permanent identifier may be used in an ACL
      (Access Control List) instead of the DN or any other form of name
      and would not need to be changed, even if the subject name of the
      entity changes.  For non-repudiation, the permanent identifier may
      be used to link different transactions to the same entity, even
      when the subject name of the entity changes.

      For audit records, the permanent identifier may be used to link
      different audit records to the same entity, even when the subject
      name of the entity changes.

   For two certificates which have been both verified to be valid
   according to a given validation policy and which contain a permanent
   identifier, those certificates relate to the same entity if their
   permanent identifiers match, whatever the content of the DN or other
   subjectAltName components may be.

   Since the use of permanent identifiers may conflict with privacy, CAs
   SHOULD advertise to purchasers of certificates the use of permanent
   identifiers in certificates.

2.  Definition of a Permanent Identifier

   This Permanent Identifier is a name defined as a form of otherName
   from the GeneralName structure in SubjectAltName, as defined in
   [X.509] and [RFC3280].




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   A CA which includes a permanent identifier in a certificate is
   certifying that any public key certificate containing the same values
   for that identifier refers to the same entity.

   The use of a permanent identifier is OPTIONAL.  The permanent
   identifier is defined as follows:

      id-on-permanentIdentifier   OBJECT IDENTIFIER ::= { id-on 3 }
        PermanentIdentifier ::=     SEQUENCE {
           identifierValue    UTF8String             OPTIONAL,
                           -- if absent, use a serialNumber attribute,
                           -- if there is such an attribute present
                           -- in the subject DN
           assigner           OBJECT IDENTIFIER      OPTIONAL
                           -- if absent, the assigner is
                           -- the certificate issuer
   }

   The identifierValue field is optional.

      When the identifierValue field is present, then the
      identifierValue supports one syntax: UTF8String.

      When the identifierValue field is absent, then the value of the
      serialNumber attribute (as defined in section 5.2.9 of [X.520])
      from the deepest RDN of the subject DN is the value to be taken
      for the identifierValue.  In such a case, there MUST be at least
      one serialNumber attribute in the subject DN, otherwise the
      PermanentIdentifier SHALL NOT be used.

   The assigner field is optional.

      When the assigner field is present, then it is an OID which
      identifies a naming space, i.e., both an Assigner Authority and
      the type of that field.  Characteristically, the prefix of the OID
      identifies the Assigner Authority, and a suffix is used to
      identify the type of permanent identifier.

      When the assigner field is absent, then the permanent identifier
      is locally unique to the CA.

   The various combinations are detailed below:

   1. Both the assigner and the identifierValue fields are present:

      The identifierValue is the value for that type of identifier.  The
      assigner field identifies the Assigner Authority and the type of
      permanent identifier being identified.



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      The permanent identifier is globally unique among all CAs.  In
      such a case, two permanent identifiers of this type match if and
      only if their assigner fields match and the contents of the
      identifierValue field in the two permanent identifiers consist of
      the same Unicode code points presented in the same order.

   2. The assigner field is absent and the identifierValue field is
      present:

      The Assigner Authority is the CA that has issued the certificate.
      The identifierValue is given by the CA and the permanent
      identifier is only local to the CA that has issued the
      certificate.

      In such a case, two permanent identifiers of this type match if
      and only if the issuer DN's in the certificates which contain them
      match using the distinguishedNameMatch rule, as defined in X.501,
      and the two values of the identifierValue field consist of the
      same Unicode code points presented in the same order.

   3. Both the assigner and the identifierValue fields are absent:

      If there are one or more RDNs containing a serialNumber attribute
      (alone or accompanied by other attributes), then the value
      contained in the serialNumber of the deepest such RDN SHALL be
      used as the identifierValue; otherwise, the Permanent Identifier
      definition is invalid and the Permanent Identifier SHALL NOT be
      used.

      The permanent identifier is only local to the CA that has issued
      the certificate.  In such a case, two permanent identifiers of
      this type match if and only if the issuer DN's in the certificates
      which contain them match and the serialNumber attributes within
      the subject DN's of those same certificates also match using the
      caseIgnoreMatch rule.

   4. The assigner field is present and the identifierValue field is
      absent:

      If there are one or more RDNs containing a serialNumber attribute
      (alone or accompanied by other attributes), then the value
      contained in the serialNumber of the deepest such RDN SHALL be
      used as the identifierValue; otherwise, the Permanent Identifier
      definition is invalid and the Permanent Identifier SHALL NOT be
      used.

      The assigner field identifies the Assigner Authority and the type
      of permanent identifier being identified.



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      The permanent identifier is globally unique among all CAs.  In
      such a case, two permanent identifiers of this type match if and
      only if their assigner fields match and the contents of the
      serialNumber attributes within the subject DN's of those same
      certificates match using the caseIgnoreMatch rule.

   Note: The full arc of the object identifier used to identify the
         permanent identifier name form is derived using:

      id-pkix OBJECT IDENTIFIER ::= { iso(1) identified-organization(3)
         dod(6) internet(1) security(5) mechanisms(5) pkix(7) }

      id-on OBJECT IDENTIFIER ::= { id-pkix 8 }   -- other name forms

3.  IANA Considerations

   No IANA actions are necessary.  However, a Private Enterprise Number
   may be used to construct an OID for the assigner field (see Annex
   B.1.).

4.  Security Considerations

   A given entity may have at an instant of time or at different
   instants of time multiple forms of identities.  If the permanent
   identifier is locally unique to the CA (i.e., the assigner field is
   not present), then two certificates from the same CA can be compared.

   When two certificates contain identical permanent identifiers, then a
   relying party may determine that they refer to the same entity.

   If the permanent identifier is globally unique among all CAs (i.e.,
   the assigner field is present), then two certificates from different
   CAs can be compared.  When they contain two identical permanent
   identifiers, then a relying party may determine that they refer to
   the same entity.  It is the responsibility of the CA to verify that
   the permanent identifier being included in the certificate refers to
   the subject being certified.

   The permanent identifier identifies the entity, irrespective of any
   attribute extension.  When a public key certificate contains
   attribute extensions, the permanent identifier, if present, should
   not be used for access control purposes but only for audit purposes.
   The reason is that since these attributes may change, access could be
   granted on attributes that were originally present in a certificate
   issued to that entity but are no longer present in the current
   certificate.





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   Subject names in certificates are chosen by the issuing CA and are
   mandated to be unique for each CA; so there can be no name collision
   between subject names from the same CA.  Such a name may be an end-
   entity name when the certificate is a leaf certificate, or a CA name,
   when it is a CA certificate.

   Since a name is only unique towards its superior CA, unless some
   naming constraints are being used, a name would only be guaranteed to
   be globally unique when considered to include a sequence of all the
   names of the superior CAs.  Thus, two certificates that are issued
   under the same issuer DN and which contain the same permanent
   identifier extension without an assigner field do not necessarily
   refer to the same entity.

   Additional checks need to be done, e.g., to check if the public key
   values of the two CAs which have issued the certificates to be
   compared are identical or if the sequence of CA names in the
   certification path from the trust anchor to the CA are identical.

   When the above checks fail, the permanent identifiers may still match
   if there has been a CA key rollover.  In such a case the checking is
   more complicated.

   The certification of different CAs with the same DN by different CAs
   has other negative consequences in various parts of the PKI, notably
   rendering the IssuerAndSerialNumber structure in [RFC3852] section
   10.2.4 ambiguous.

   The permanent identifier allows organizations to create links between
   different certificates associated with an entity issued with or
   without overlapping validity periods.  This ability to link different
   certificates may conflict with privacy.  It is therefore important
   that a CA clearly disclose any plans to issue certificates which
   include a permanent identifier to potential subjects of those
   certificates.

5.  References

5.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3280]  Housley, R., Polk, W., Ford, W., and D. Solo, "Internet
              X.509 Public Key Infrastructure Certificate and
              Certificate Revocation List (CRL) Profile", RFC 3280,
              April 2002.




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   [UTF-8]    Yergeau, F., "UTF-8, a transformation format of ISO
              10646", STD 63, RFC 3629, November 2003.

   [X.501]    ITU-T Rec X.501 | ISO 9594-2: 2001: Information technology
              - Open Systems Interconnection - The Directory: Models,
              February 2001.

5.2.  Informative References

   [RFC3852]  Housley, R., "Cryptographic Message Syntax (CMS)", RFC
              3852, July 2004.

   [X.509]    ITU-T Recommendation X.509 (1997 E): Information
              Technology - Open Systems Interconnection - The Directory:
              Authentication Framework, June 1997.

   [X.520]    ITU-T Recommendation X.520: Information Technology - Open
              Systems Interconnection - The Directory: Selected
              Attribute Types, June 1997.

   [X.660]    ITU-T Recommendation X.660: Information Technology - Open
              Systems Interconnection - Procedures for the Operation of
              OSI Registration Authorities: General Procedures, 1992.

   [X.680]    ITU-T Recommendation X.680: Information Technology -
              Abstract Syntax Notation One, 1997.

























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Appendix A.  ASN.1 Syntax

   As in RFC 2459, ASN.1 modules are supplied in two different variants
   of the ASN.1 syntax.

   This section describes data objects used by conforming PKI components
   in an "ASN.1-like" syntax.  This syntax is a hybrid of the 1988 and
   1993 ASN.1 syntaxes.  The 1988 ASN.1 syntax is augmented with 1993
   the UNIVERSAL Type UTF8String.

   The ASN.1 syntax does not permit the inclusion of type statements in
   the ASN.1 module, and the 1993 ASN.1 standard does not permit use of
   the new UNIVERSAL types in modules using the 1988 syntax.  As a
   result, this module does not conform to either version of the ASN.1
   standard.

   Appendix A.1 may be parsed by an 1988 ASN.1-parser by replacing the
   definitions for the UNIVERSAL Types with the 1988 catch-all "ANY".

   Appendix A.2 may be parsed "as is" by an 1997-compliant ASN.1 parser.

   In case of discrepancies between these modules, the 1988 module is
   the normative one.

Appendix A.1.  1988 ASN.1 Module

  PKIXpermanentidentifier88 {iso(1) identified-organization(3) dod(6)
         internet(1) security(5) mechanisms(5) pkix(7) id-mod(0)
         id-mod-perm-id-88(28) }

  DEFINITIONS EXPLICIT TAGS ::=

     BEGIN

     -- EXPORTS ALL --

     IMPORTS

  -- UTF8String, / move hyphens before slash if UTF8String does not
  -- resolve with your compiler
  -- The content of this type conforms to [UTF-8].

          id-pkix
                FROM PKIX1Explicit88 { iso(1) identified-organization(3)
                dod(6) internet(1) security(5) mechanisms(5) pkix(7)
                id-mod(0) id-pkix1-explicit(18) } ;
                -- from [RFC3280]




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     -- Permanent identifier Object Identifier and Syntax

     id-on   OBJECT IDENTIFIER ::= { id-pkix 8 }

     id-on-permanentIdentifier   OBJECT IDENTIFIER ::= { id-on 3 }

     PermanentIdentifier ::= SEQUENCE {
          identifierValue    UTF8String             OPTIONAL,
                          -- if absent, use the serialNumber attribute
                          -- if there is a single such attribute present
                          -- in the subject DN
          assigner           OBJECT IDENTIFIER      OPTIONAL
                          -- if absent, the assigner is
                          -- the certificate issuer
  }

  END

Appendix A.2.  1993 ASN.1 Module

PKIXpermanentidentifier93 {iso(1) identified-organization(3) dod(6)
       internet(1) security(5) mechanisms(5) pkix(7) id-mod(0)
       id-mod-perm-id-93(29) }

   DEFINITIONS EXPLICIT TAGS ::=

   BEGIN

   -- EXPORTS ALL --

   IMPORTS

        id-pkix
              FROM PKIX1Explicit88 { iso(1) identified-organization(3)
              dod(6) internet(1) security(5) mechanisms(5) pkix(7)
              id-mod(0) id-pkix1-explicit(18) }
               -- from [RFC3280]

        ATTRIBUTE
              FROM InformationFramework {joint-iso-itu-t ds(5) module(1)
              informationFramework(1) 4};
               -- from [X.501]

   -- Permanent identifier Object Identifiers

   id-on   OBJECT IDENTIFIER ::= { id-pkix 8 }

   id-on-permanentIdentifier   OBJECT IDENTIFIER ::= { id-on 3 }



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   -- Permanent Identifier

   permanentIdentifier ATTRIBUTE ::= {
          WITH SYNTAX     PermanentIdentifier
          ID              id-on-permanentIdentifier }

   PermanentIdentifier ::= SEQUENCE {
        identifierValue    UTF8String             OPTIONAL,
                        -- if absent, use the serialNumber attribute
                        -- if there is a single such attribute present
                        -- in the subject DN
        assigner           OBJECT IDENTIFIER      OPTIONAL
                        -- if absent, the assigner is
                        -- the certificate issuer
}

END

Appendix B.  OID's for Organizations

   In order to construct an OID for the assigner field, organizations
   need first to have a registered OID for themselves.  Such an OID must
   be obtained from a registration authority following [X.660].  In some
   cases, OID's are provided for free.  In other cases a one-time fee is
   required.  The main difference lies in the nature of the information
   that is collected at the time of registration and how this
   information is verified for its accuracy.

Appendix B.1.  Using IANA (Internet Assigned Numbers Authority)

   The application form for a Private Enterprise Number in the IANA's
   OID list is: http://www.iana.org/cgi-bin/enterprise.pl.

   Currently, IANA assigns numbers for free.  The IANA-registered
   Private Enterprises prefix is:
   iso.org.dod.internet.private.enterprise (1.3.6.1.4.1)

   These numbers are used, among other things, for defining private SNMP
   MIBs.

   The official assignments under this OID are stored in the IANA file
   "enterprise-numbers" available at:
   http://www.iana.org/assignments/enterprise-numbers








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Appendix B.2.  Using an ISO Member Body

   ISO has defined the OID structure in a such a way so that every ISO
   member-body has its own unique OID.  Then every ISO member-body is
   free to allocate its own arc space below.

   Organizations and enterprises may contact the ISO member-body where
   their organization or enterprise is established to obtain an
   organization/enterprise OID.

   Currently, ISO members do not assign organization/enterprise OID's
   for free.

   Most of them do not publish registries of such OID's which they have
   assigned, sometimes restricting the access to registered
   organizations or preferring to charge inquirers for the assignee of
   an OID on a per-inquiry basis.  The use of OID's from an ISO member
   organization which does not publish such a registry may impose extra
   costs on the CA that needs to make sure that the OID corresponds to
   the registered organization.

   As an example, AFNOR (Association Francaise de Normalisation - the
   French organization that is a member of ISO) has defined an arc to
   allocate OID's for companies:

   {iso (1) member-body (2) fr (250) type-org (1) organisation (n)}

Appendix B.3.  Using an ICD (International Code Designator) From British
               Standards Institution to Specify a New or an Existing
               Identification Scheme

   The International Code Designator (ICD) is used to uniquely identify
   an ISO 6523 compliant organization identification scheme.  ISO 6523
   is a standard that defines the proper structure of an identifier and
   the registration procedure for an ICD.  The conjunction of the ICD
   with an identifier issued by the registration authority is worldwide
   unique.

   The basic structure of the code contains the following components:

   -  the ICD value: The International Code Designator issued to the
      identification scheme makes the identifier worldwide unique (up to
      4 digits),

   -  the Organization, usually a company or governmental body (up to 35
      characters),





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   -  an Organization Part (OPI - Organization Part Identifier).  An
      identifier allocated to a particular Organization Part (optional,
      up to 35 characters)

   The ICD is also equivalent to an object identifier (OID) under the
   arc {1(iso).  3(identified organization)}.

   On behalf of ISO, British Standards Institution (BSI) is the
   Registration Authority for organizations under the arc {iso (1)
   org(3)}.  This means BSI registers code issuing authorities
   (organizations) by ICD values which are equivalent to OIDs of the
   form {iso (1) org(3) icd(xxxx)}.  The corresponding IdentifierValue
   is the code value of the scheme identified by icd(xxxx).

   As an example, the ICD 0012 was allocated to European Computer
   Manufacturers Association: ECMA.  Thus the OID for ECMA is {iso(1)
   org(3) ecma(12)}.

   For registration with BSI, a "Sponsoring Authority" has to vouch for
   the Applying organization.  Registration is not free.  Recognized
   "Sponsoring Authorities" are: ISO Technical Committees or
   (Sub)Committees, Member Bodies of ISO or International Organizations
   having a liaison status with ISO or with any of its Technical
   (Sub)Committees.

   An example of a Sponsoring Authority is the EDIRA Association (EDI/EC
   Registration Authority, web: http://www.edira.org,
   email:info@edira.org).

   The numerical list of all ICDs that have been issued is posted on its
   webpage: http://www.edira.org/documents.htm#icd-List

   Note: IANA owns ICD code 0090, but (presumably) it isn't intending to
   use it for the present purpose.

















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Authors' Addresses

   Denis Pinkas
   Bull
   Rue Jean-Jaures BP 68
   78340 Les Clayes-sous-Bois
   FRANCE

   EMail: Denis.Pinkas@bull.net


   Thomas Gindin
   IBM Corporation
   6710 Rockledge Drive
   Bethesda, MD 20817
   USA

   EMail: tgindin@us.ibm.com

































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RFC 4043                  Permanent Identifier                  May 2005


Full Copyright Statement

   Copyright (C) The Internet Society (2005).

   This document is subject to the rights, licenses and restrictions
   contained in BCP 78, and except as set forth therein, the authors
   retain all their rights.

   This document and the information contained herein are provided on an
   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS
   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND THE INTERNET
   ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
   INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
   INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
   WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Intellectual Property

   The IETF takes no position regarding the validity or scope of any
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   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
   might or might not be available; nor does it represent that it has
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   on the procedures with respect to rights in RFC documents can be
   found in BCP 78 and BCP 79.

   Copies of IPR disclosures made to the IETF Secretariat and any
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   attempt made to obtain a general license or permission for the use of
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   http://www.ietf.org/ipr.

   The IETF invites any interested party to bring to its attention any
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Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.







Pinkas & Gindin             Standards Track                    [Page 15]




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