Overview#

X500UniqueIdentifier (x500UniqueIdentifier) is a binary method of identification useful for differentiating objects when a Distinguished Name has been reused.

In X.520, this AttributeTypes is called 'uniqueIdentifier' which is a different attribute type from both the LDAP 'uid' and LDAP UniqueIdentifier AttributeTypes.

LDAP Attribute Definition#

The X500UniqueIdentifier AttributeTypes is defined as:

• OID of 2.5.4.45
• NAME: X500UniqueIdentifier
• DESC:
• OBSOLETE flag (only if present)
• Supertype:
  • (only if present)
• EQUALITY: BitStringMatch
• ORDERING:
• SYNTAX: 1.3.6.1.4.1.1466.115.121.1.6 (Bit String)
• NO-USER-MODIFICATION (only if present)
• USAGE: DirectoryOperation
• Extended Flags:
  • X-ORIGIN: RFC 4519
• Used as MUST in:
• Used MAY in:
  • !! More Information

There might be more information for this subject on one of the following:

• 2.5.4.45
• 2.5.6.7
• InetOrgPerson
• LDAP Object Identifier Descriptors