Identifier Glossary

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Portability must be included as part of a thoroughgoing review/rewrite of the section of eduPerson (200806) on "Identifier Concepts:"

1) uniqueness

2) persistence
2a) reassignable

3) mutable
3a) resynchable

4) palatable

5) opacity

6) correlatable

7) privacy

8) portable

Many of these properties need to have more possible values than True or False.

The Trouble with Glossaries – RL "Bob" Morgan

[Few of the properties] are properties of the identifiers themselves, most are properties of the use of the identifiers in the context of many interacting systems.

Look at reassignment. It has to do with practices at the IdP, whether an identifier continues to apply to the same entity or can be used for a different one. The identifier stays the same, it's the mapping to the "real world entities" that might change. So the model needs to include those entities, the IdM system that maintains (or doesn't) the mapping, and the interest of the RP in the continuity of the mapping.

Full Size

Here's a trial run with further revisions (dependency is indicated by indentation)

From perspective of the University of Wisconsin-Madison as IdP

Properties of Identifier Usage ePPN UUID PVI ePTID
– Scope
  • Uniqueness
within scope global within scope global
– Reversible reversible reversible reversible reversible
– Persistence persistent persistent persistent persistent
– Transparency transparent opaque opaque opaque
  • Palatibility
palatable no palatable no
– Mutable mutable on approved user request mutable only in case of mistaken identity mutable only in case of mistaken identity mutable
  • Reassignable
potentially no potentially no
  • Resynchable
resynchable no no resynchable
– Correlatable correlatable correlatable correlatable only within specific application group
– Portable no potentially no no

NOTE: Name identifiers are a threat to privacy to the extent that they are transparent, reversable, resynchable,

correlatable and portable

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