Method for allocating useful data to a specific originator
Patent 5208858 Issued on May 4, 1993. Estimated Expiration Date: 
January 24, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 24, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPublic key/signature cryptosystem with enhanced digital signature certification Method and apparatus for verifying the integrity of a file stored separately from a computer Method and apparatus for controlling the use of a public key, based on the level of import integrity for the key Patent #: 5073934 InventorsAssigneeApplicationNo. 645496 filed on 01/24/1991US Classes:380/43, Key sequence signal combined with data signal380/28, PARTICULAR ALGORITHMIC FUNCTION ENCODING380/30, Public key380/42, Data stream/substitution enciphering713/175, By generation of certificate713/176Authentication by digital signature representation or digital watermarkExaminersPrimary: Buczinski, Stephen C.Attorney, Agent or FirmInternational ClassesH04L 009/02H04K 001/00 H04K 009/00 Foreign Application Priority Data1990-02-05 DEAbstractThe hash result of useful data is transmitted to a multiply-protected central server in which it is transformed into a signature on the basis of a crypto operations system combination with a private key code of the originator. The signature is deposited in the central server and is available as what is referred to as a "digital signature" for the transmission of the useful data.Other References
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