Netscape Certificate Management System 6.2, Руководство администратора

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What Is a Distinguished Name?
782 Netscape Certificate Management System Administrator’s Guide • June 2003
Distinguished Name Components
A DN identifies an entry in an LDAP directory. Because directories are
hierarchical, DNs identify the entry by its location as a path in a hierarchical tree
(much as a path in a file system identifies a file). Generally, a DN begins with a
specific common name, and proceeds with increasingly broader areas of
identification until the country name is specified. DNs are typically made up of the
following components (which are defined in the X.520 standard):
CN=common name, OU=organizational unit, O=organization, L=locality,
ST=state or province, C=country name
These components are described in Table I-1. For more information on
distinguished names, see RFC 2253 (which replaces RFC 1779). You can find RFC
2253 at this URL:
http://www.ietf.org/rfc/rfc2253.txt
Note that if used in conjunction with an LDAP-compliant directory, Certificate
Management System by default recognizes components that are listed in Table I-2.
Table I-1
Definitions of standard DN components
Component Name Definition
CN
Common name A required component that identifies the person or object defined
by the entry. For example:
• CN=Jane Doe
• CN=corpDirectory.example.com
E
(deprecated)
Email address Identifies the email address of the entry. For example:
jdoe@example.com
The use of this component is discouraged by the PKIX standard;
instead, it recommends the use of Subject Alternative Name Extension
to associate an email address with a certificate; see
“subjectAltName” on page 766. The reason for this is because it is
usually too hard to have a
E
in a directory structure; email
addresses change too frequently.
OU
Organizational unit Identifies a unit within the organization. For example:
• OU=Sales
• OU=Manufacturing
O
Organization Identifies the organization in which the entry resides. For example:
• O=Example Corporation
• O=Public Power & Gas