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The U-Prove SDK has the following comment: (link)

// 1: CA-RA split (a party trusted by the issuer provides the gamma value)

Given that the Gamma value (if provided) overrides the Attributes value, does that mean the issuer can be separated into two IdPs that can have dedicated purposes?

e.g.

  1. One secure IdP to verify the attributes
  2. A second IdP generate the UProve token with no knowledge of the attributes

... and the only communication between the IdPs is the "gamma" value?

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Why the downvote? CA and similar technologies are on topic –  makerofthings7 Jul 30 '13 at 13:52

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