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* '''static''': the identifier is created at the time of user creation at the IdP
→Persistent user identifiers
=== Persistent user identifiers ===
For most services, it is necessary to store application-specific data, such as user edits for a wiki page. This data is stored in a database , which is local to the SP, while the key between the user and the database entry is the '''persistent user identifier'''.
Persistent identifiers can be:
* '''computed''': the identifier is generated run-time from one or more attributes of the user (usually by some cryptographic hashing algorithm).
* '''stored''': the identifier is stored in the user's digital identity at the IdP, thus it is persistent even when other user information is changed. Uniqueness of the identifier must be preserved.
