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Attribute space: LoAs , aggregation and reputation

Attribute space: LoAs , aggregation and reputation. Setting the Landscape. LoLoAs (not an erratum). The LoA concept has originally been associated to quality of credentials Two-factor authentication vs username/password… SAML AuthN Context emphasized this

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Attribute space: LoAs , aggregation and reputation

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  1. Attribute space: LoAs, aggregation and reputation

  2. Setting the Landscape

  3. LoLoAs (not an erratum) • The LoA concept has originally been associated to quality of credentials • Two-factor authentication vs username/password… • SAML AuthN Context emphasized this • NIST (and NIST-like) classifications did as well • Attributes constitute the core of an identity • LoA on asserted attributes are key to take informed decisions • And that brings us to different Levels of Levels of Assurance

  4. The Axes

  5. Attribute Authorities • Entities providing additional attributes about users • Not available at their home IdP • Mostly because of management reasons • Key for the VO promise • Explosion of authoritative AttAuts is a concern • And they may pose additional privacy challenges • Several implementations currently available • VOMS (originally X.509-based, now with SAML gateway) • SWITCH VO management system (Shib-based) • FEIDE VO PoC (OAuth) • RedIRIS AA (SAML-based) • GN3 JRA3T2 (starting) • …

  6. Attribute Aggregators • User-controlled sources of attributes • Collecting them from AttAuts • The SHINTAU project • Shib-based • Demo available at http://issrg-beta.cs.kent.ac.uk:8080/loademo.html • The Kantara UMA Working Group • Mostly influenced by the OAuth community • Attribute access can be considered a particular case • No implementation yet • http://kantarainitiative.org/confluence/display/uma/

  7. Reputation Systems • AttAggs that offer additional interfaces to update attribute values • Social trust and beliefs • Social does not mean necessarily “massive” • The next step in IdM? • Object of a work-item in TF-EMC2 • Few (if any) implementations • The ARETUSA model for BitTorrent • Plans to extend the RedIRIS AA

  8. The Possible Next Steps • Attribute source discovery • Open AttAut, AttAgg, Reputation sources? • Are they total or partial members of federations? • Representation for attribute sources and LoAs • Meta-attributes? • Evaluation procedures for trust on attributes • Attribute algebra? • LoA set operations? • Keeping all this in the appropriate practical limits • Avoid to make this an academic issue

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