Controlled-content recoverable blinded certificates

Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Central trusted authority provides computer authentication

Reexamination Certificate

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Details

C713S180000, C380S030000, C380S044000

Reexamination Certificate

active

07370196

ABSTRACT:
In a cryptographic system, a certificate is used to provide information regarding a client device. The certificate is blindly signed by a certifying authority to preserve the anonymity of the client device. However, information is encoded into the signature so that a content server can readily verify security attributes of the client device and make decisions regarding the delivery of electronic content to the client device based on those security attributes.

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Chaum David; “Online Cash Checks”; 1998; pp. 288-293, in parent app.
Stubblebine et al.; “Unlinkable Serial Transactions: Protocols and Applications”; ACM Transactions on Information and Systems Security, vol. 2, Issue 4, Nov. 1999; pp. 354-389; ISSN:1094-9224.

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