Cryptographic privacy protection in TCPA

[Ben Laurie]

Nomen Nescio wrote:
> Some of the claims seem a little broad, like this first one:
> 
> 
>>1. A method for establishing a pseudonym system by having a certificate
>>authority accepting a user as a new participant in said pseudonym system,
>>the method comprising the steps of: receiving a first public key provided
>>by said user; verifying that said user is allowed to join the system;
>>computing a credential by signing the first public key using a secret
>>key owned by said certificate authority; publishing said first public
>>key and said credential.
> 
> 
> Wouldn't this general description cover most proposed credential systems
> in the past, such as those by Chaum or Brands?

Or, indeed, X.509.

Cheers,

Ben.

-- 
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