05659616 is referenced by 369 patents and cites 8 patents.

A system for securely using digital signatures in a commercial cryptographic system that allows industry-wide security policy and authorization information to be encoded into the signatures and certificates by employing attribute certificates to enforce policy and authorization requirements. In addition to value limits, cosignature requirements and document type restrictions that can be placed on transactions, an organization can enforce with respect to any transaction geographical and temporal controls, age-of-signature limitations, preapproved counterparty limitations and confirm-to requirements by using attribute certificates for the transacting user. Restrictions on distribution of certificates can be set using attribute certificates. Certificates can be used also to ensure key confinement and non-decryption requirements of smartcards in this system.

Title
Method for securely using digital signatures in a commercial cryptographic system
Application Number
277438
Publication Number
5659616
Application Date
July 16, 1996
Publication Date
August 19, 1997
Inventor
Frank Wells Sudia
New York
NY, US
Agent
Cushman Darby & Cushman IP Group of Pillsbury Madison & Sutro
Assignee
Certco
NY, US
IPC
H04K 1/00
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