Patents by Inventor Wakefield S. Stornetta, Jr.

Wakefield S. Stornetta, Jr. 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: 5373561
    Abstract: A cryptographic certificate attesting to the authenticity of original document elements, such as time of creation, content, or source, will lose its value when the cryptographic function underlying the certifying scheme is compromised. The present invention provides a means for extending the reliability of such a certificate by subjecting, prior to any such compromise, a combination of the original certificate and the document digital representation from which that certificate was derived to a scheme based on a different and ostensibly less vulnerable function. The new certificate resulting from this procedure extends the validity of the original authenticity by implacably incorporating the original certificate at a time when that certificate could only have been derived by legitimate means.
    Type: Grant
    Filed: December 21, 1992
    Date of Patent: December 13, 1994
    Assignee: Bell Communications Research, Inc.
    Inventors: Stuart A. Haber, Wakefield S. Stornetta, Jr.
  • Patent number: 5136647
    Abstract: A system for time-stamping a digital document, including for example text, video, audio, or pictorial data, protects the secrecy of the document text and provides a tamper-proof time seal establishing an author's claim to the temporal existence of the document. Initially, the author reduces the document to a number by means of a one-way hash function, thereby fixing a unique representation of the document text. In one embodiment of the invention the number is then transmitted to an outside agency where the current time is added to form a receipt which is certified by the agency using a public key signature procedure before being returned to the author as evidence of the document's existence. In later proof of such existence, the certificate is authenticated by means of the agency's public key to reveal the receipt which comprises the hash of the alleged document along with the time seal that only the agency could have signed into the certificate.
    Type: Grant
    Filed: August 2, 1990
    Date of Patent: August 4, 1992
    Assignee: Bell Communications Research, Inc.
    Inventors: Stuart A. Haber, Wakefield S. Stornetta, Jr.
  • Patent number: 5136646
    Abstract: A system for time-stamping a digital document, for example any alphanumeric, video, audio, or pictorial data, protects the secrecy of the document text and provides a tamper-proof time seal establishing an author's claim to the temporal existence of the document. Initially, the document may be condensed to a single number by means of a one-way hash function, thereby fixing a unique representation of the document text. The document representation is transmitted to an outside agency where the current time is added to form a receipt. The agency then certifies the receipt by adding and hashing the receipt data with the current record catenate certificate which itself is a number obtained as a result of the sequential hashing of each prior receipt with the extant catenate certificate. The certified receipt bearing the time data and the catenate certificate number is then returned to the author as evidence of the document's existence.
    Type: Grant
    Filed: March 8, 1991
    Date of Patent: August 4, 1992
    Assignee: Bell Communications Research, Inc.
    Inventors: Stuart A. Haber, Wakefield S. Stornetta, Jr.
  • Patent number: RE34954
    Abstract: A system for time-stamping a digital document, including for example text, video, audio, or pictorial data, protects the secrecy of the document text and provides a tamper-proof time seal establishing an author's claim to the temporal existence of the document. Initially, the author reduces the document to a number by means of a one-way hash function, thereby fitting a unique representation of the document text. In one embodiment of the invention the number is then transmitted to an outside agency where the current time is added to form a receipt which is certified by the agency using a public key signature procedure before being returned to the author as evidence of the document's existence. In later proof of such existence, the certificate is authenticated by means of the agency's public key to reveal the receipt which comprises the hash of the alleged document along with the time seal that only the agency could have signed into the certificate.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: May 30, 1995
    Assignee: Bell Communications Research, Inc.
    Inventors: Stuart A. Haber, Wakefield S. Stornetta, Jr.