Privacy Req 4
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PRIVACY-4. CREDENTIAL LIMITATION
Entities MUST NOT request USERS’ credentials unless necessary for the transaction and then only as appropriate to the risk associated with the transaction or to the risks to the parties associated with the transaction.
Intermediaries may not have a direct relationship with individuals whose data moves through their systems, but should facilitate endpoints' ability to conform to this Requirement.
See the IDESG Functional Model for definition of Transaction Intermediation for the scope of “intermediaries.” The functional model describes Transaction Intermediation as “Processes and procedures that limit linkages between transactions and facilitate credential portability." This includes functions defined as “Blinding,” “Psuedonymization/Anonymization,” and “Exchange.”
Credentials bound to identifiers, like attributes bound to identifiers, carry increased risk of inappropriate disclosure when stored. See generally PRIVACY-1. This requirement PRIVACY-4 assumes that the privacy risk analysis required by PRIVACY-5 will inform an entity's decisions about credential retention.
References and Guidance (non-normative)
Further reference materials to aid organizations interested in conforming to these Requirements can be found at the wiki page Supplemental Privacy Guidance; this has been archived at https://workspace.idesg.org/kws/public/download.php/56/Supplemental-Privacy-Guidance.docx