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Used in the Baseline Functional Requirements v1.0

"Intermediation" (or "Transaction Intermediation") is defined in the IDEF Functional Model in part as a "Processes and procedures that limit linkages between transactions and facilitate credential portability."

The Functional Model, published as a PDF here: download link, generally sorts core identity management operations into five categories of activities and services, including identity transaction intermediation: a full description of this activity type can be found in that document. Among other things, the Functional Model sets forth the following table of functions included within "transaction intermediation" in its Functional Elements Descriptions Matrix:

Blinding Process by which service providers involved in a transaction are prevented from observing each other (i.e., a relying party does not know which credential service provider an entity is utilizing in a transaction or vice versa). Based upon the transaction type and the number of service providers involved, blinding may be done to prevent a single, multiple, or all service providers from viewing the other participating services.
Pseudonymization/ Anonymization Process by which an intermediary prevents service providers from linking a digital identity with a particular person or entity.
Exchange Process by which one protocol is translated to another for consumption by different entities involved in a transaction.