The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 28, 1997
Filed:
Aug. 17, 1994
Ralph Linsker, Millwood, NY (US);
Charles H Bennett, Croton-on-Hudson, NY (US);
IBM Corporation, Armonk, NY (US);
Abstract
A method and apparatus authenticates and provides non-repudiability for analog messages which renders it impossible for a person, including the recipient, who is not in possession of a (cryptographic) key belonging to the claimed sender, to forge the message. The recipient is able to verify that the sender possessed the correct key, and a third party (judge) can establish whether the message was forged or not. This is accomplished by interposing a digital signature generator/verifier/recorder (DS-GVR) module in the sending apparatus, such as a facsimile machine. The receiver, using another DS-GVR, can verify that a received document comes from the purported sender and has not been altered enroute. The receiver's DS-GVR module can be made to produce a machine-readable record of the signed transmission. Retention of such a machine-readable record by the receiver prevents the sender from repudiating legitimate messages, because it enables the receiver to prove to a third party such as a judge that the corresponding message was generated by the sender and not by the receiver.