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Requesting Anonymous Certificates

Delivering Anonymous Certificates Presented to: IDTrust2009 Presented by: James L. Fisher (jlf@...org) Date: April 16, 2009. Requesting Anonymous Certificates. Anonymous CA. Authorizer (Z). User. Request for anon key pair + cert = f( assignedGroup, Encr z (trueID) ).

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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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