Field initialized authentication system for protective security of electronic information networks
Patent 4731841 Issued on March 15, 1988. Estimated Expiration Date: 
June 16, 2006. 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.
June 16, 2006. 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 ReferencesRecipient and message authentication method and system Apparatus and method for cryptographic identity verification Protection system for intelligent cards System and process for identification of persons requesting access to particular facilities Encryption system key distribution method and apparatus Patent #: 4578531 InventorsAssigneeApplicationNo. 06/874381 filed on 06/16/1986US Classes:713/159, Including intelligent token380/28, PARTICULAR ALGORITHMIC FUNCTION ENCODING380/30, Public key704/272Novelty itemExaminersPrimary: Cangialosi, SalvatoreAssistant: Lewis, Aaron J. Attorney, Agent or FirmInternational ClassesG07F 7/10 (20060101)H04L 9/32 (20060101) AbstractAn authentication system for electronic information networks having small hand-held portable authenticating devices which are remotely initialized and can use 4 bit microprocessors in a challenge-response security system and yet permit practical communication of the large numbers which are necessary for sufficient security.Other References
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