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Requesting Anonymous Certificates

This document outlines the process of requesting and generating anonymous certificates through Anonymous CA Authorizer (Z). It details the steps involved in requesting an anonymous key pair and certificate, including authorization checks, eligibility verification, and the ability to generate and send the anonymous key pair and certificate. The process emphasizes confidentiality by ensuring that the authorizer knows which anonymous keys were sent but not who received them, aiming to prevent collusion. The document provides insights into managing requests and securing anonymity.

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Requesting Anonymous Certificates

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  1. Delivering Anonymous CertificatesPresented to: IDTrust2009Presented by: James L. Fisher (jlf@...org)Date: April 16, 2009

  2. Requesting Anonymous Certificates Anonymous CA Authorizer (Z) User • Request for anon key pair + cert= f( assignedGroup, Encrz(trueID) ) • Authorization request= f( Encrz(trueID) ) • Decr( Encrz(trueID) ) • Too many requests? • Authorization granted • Generate & sendanon key pair + cert • Has authZ to act • Knows which anon keyssent • Does not know whoreceived them • Checks eligibility • Knows requestor’s ID • Does not know anonkeys sent “Two to collude”

  3. Requesting Anonymous Certificates Anonymous CA Authorizer (Z) User • Request for anon key pair + cert= f( assignedGroup, Encrz(trueID) ) • Authorization request= f( Encrz(trueID) ) • Decr( Encrz(trueID) ) • Too many requests? • AuthZn granted • Generate & sendanon key pair + cert • Has authZ to act • Knows which anon keyssent • Does not know whoreceived them • Checks eligibility • Knows requestor’s ID • Does not know anonkeys sent “Two to collude”

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