Patents by Inventor Jeffrey Charles Crigler

Jeffrey Charles Crigler 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).

  • Patent number: 5673316
    Abstract: A method and apparatus to create, distribute, sell and control access to digital documents using secure cryptographic envelopes. An envelope is an aggregation of information parts, where each of the parts to be protected are encrypted with a corresponding part encryption key. These encrypted information parts along with the other information parts become part of the envelope. Each part encryption key is also encrypted with a public key, and these encrypted part encryption keys are also included in the envelope. The envelope also includes a list of parts where each entry in the list has a part name and a secure hash of the named part. The list is then signed with a secret key to generate a signature, which is also included in the envelope. The signature can be verified using a second public key associated with first secret key, and the integrity of any information part in the envelope can be checked by computing a second hash and comparing it with the corresponding hash in the list of parts.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: September 30, 1997
    Assignee: International Business Machines Corporation
    Inventors: Joshua Seth Auerbach, Chee-Seng Chow, Marc Adam Kaplan, Jeffrey Charles Crigler