The SAML V2.0 Pairwise Subject Identifier (pairwise-id) is a user identifier attribute defined in the SAML v2.0 Subject Identifier Attributes Profile. It is a long-lived, non-reassignable, unidirectional identifier suitable for use as a unique external key specific to a particular relying party. Its value for a given subject depends upon the relying party to whom it is given, thus preventing unrelated systems from using it as a basis for correlation.
See: SAML v2.0 Subject Identifier Profile - Pairwise Subject Identifier→
Use in the InCommon Federation
The InCommon Technical Advisory Committee (TAC) is developing adoption and implementation guidance for the SAML v2.0 Subject Identifier Attributes Profile. To learn more, visit the TAC wiki.