Patents by Inventor Philip G. Levy

Philip G. Levy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Distributed validation of digitally signed electronic documents
    Patent number: 9800416
    Abstract: Systems and methods are presented for distributed validation of a digitally signed electronic document. A computing device accesses both a representation of the electronic document and a digital signature for the electronic document that includes a digest generated by the digital signature's creator by applying a one-way function to the electronic document. The computing device applies the same one-way function to the accessed representation of the electronic document to generate a new digest, and includes both the digital signature and the new digest in a request sent to a separate validation server. The request does not include the electronic document. The validation server generates validation results that depend on comparing the digest from the digital signature with the new digest, and that do not depend on having the electronic document available to the validation server. The computing device receives the validation results from the separate validation server.
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: October 24, 2017
    Assignee: ADOBE SYSTEMS INCORPORATED
    Inventors: Isak Tenenboym, Philip G. Levy, Marc T. Kaufman, John T. Landwehr
  • Distributed Validation of Digitally Signed Electronic Documents
    Publication number: 20160127131
    Abstract: Systems and methods are presented for distributed validation of a digitally signed electronic document. A computing device accesses both a representation of the electronic document and a digital signature for the electronic document that includes a digest generated by the digital signature's creator by applying a one-way function to the electronic document. The computing device applies the same one-way function to the accessed representation of the electronic document to generate a new digest, and includes both the digital signature and the new digest in a request sent to a separate validation server. The request does not include the electronic document. The validation server generates validation results that depend on comparing the digest from the digital signature with the new digest, and that do not depend on having the electronic document available to the validation server. The computing device receives the validation results from the separate validation server.
    Type: Application
    Filed: January 11, 2016
    Publication date: May 5, 2016
    Inventors: Isak Tenenboym, Philip G. Levy, Marc T. Kaufman, John T. Landwehr
  • Distributed validation of digitally signed electronic documents
    Patent number: 9276749
    Abstract: Systems and methods are presented for distributed validation of a digitally signed electronic document. A computing device accesses both a representation of the electronic document and a digital signature for the electronic document that includes a digest generated by the digital signature's creator by applying a one-way function to the electronic document. The computing device applies the same one-way function to the accessed representation of the electronic document to generate a new digest, and includes both the digital signature and the new digest in a request sent to a separate validation server. The request does not include the electronic document. The validation server generates validation results that depend on comparing the digest from the digital signature with the new digest, and that do not depend on having the electronic document available to the validation server. The computing device receives the validation results from the separate validation server.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: March 1, 2016
    Assignee: Adobe Systems Incorporated
    Inventors: Isak Tenenboym, Philip G. Levy, Marc T. Kaufman, John T. Landwehr
  • Distributed Validation of Digitally Signed Electronic Documents
    Publication number: 20140040611
    Abstract: Systems and methods are presented for distributed validation of a digitally signed electronic document. A computing device accesses both a representation of the electronic document and a digital signature for the electronic document that includes a digest generated by the digital signature's creator by applying a one-way function to the electronic document. The computing device applies the same one-way function to the accessed representation of the electronic document to generate a new digest, and includes both the digital signature and the new digest in a request sent to a separate validation server. The request does not include the electronic document. The validation server generates validation results that depend on comparing the digest from the digital signature with the new digest, and that do not depend on having the electronic document available to the validation server. The computing device receives the validation results from the separate validation server.
    Type: Application
    Filed: July 31, 2012
    Publication date: February 6, 2014
    Inventors: Isak Tenenboym, Philip G. Levy, Marc T. Kaufman, John T. Landwehr