Method for electronic transaction with digital signature
Patent 5018196 Issued on May 21, 1991. Estimated Expiration Date: 
July 5, 2009. 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.
July 5, 2009. 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 ReferencesSoftware distribution system Blind signature systems Reliable document authentication system Public key/signature cryptosystem with enhanced digital signature certification Digital signature system and method based on a conventional encryption function Electronic transaction system Patent #: 4885777 InventorsAssigneeApplicationNo. 375828 filed on 07/05/1989US Classes:380/30, Public key705/75, Transaction verification713/176Authentication by digital signature representation or digital watermarkExaminersPrimary: Tarcza, Thomas H.Assistant: Swann, Tod R. Attorney, Agent or FirmInternational ClassH04K 009/00Foreign Application Priority Data1988-12-23 JPAbstractA mediation can be requested to a computer connected to a communications network when transacting parties A and B effect an electronic transaction and trouble takes place during the transaction. The transaction is effected by a procedure where the transacting party B transmits its preliminary digital signature to the transacting party A. When the transacting party B agrees with the contract document M transacting part A has submitted, the transacting parties A and B exchange their formal signature with each other. These signatures are obtained by coding data including a hash total h(M) obtained by transforming the contract docmument M, identifiers of the transacting parties A and B and a data identifier indicating whether the data are prepared for the preliminary on the formal signature by the public key cryptosystem using a secrete key for one of the transaction parties. When a trouble takes place, the mediation organization decodes the signatures submitted by the transacting parties as evidences by using a public key and checks as the basic of h(M) and the identifiers of the transacting parties whether the evidence data concern the same transaction or not. Finally, it decides the sort of the signatures based on the data identifiers and deduces a conclusion of the mediation.Other References
Field of SearchPublic key | |
