Network message security method and apparatus
Patent 5177788 Issued on January 5, 1993. Estimated Expiration Date: 
October 15, 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.
October 15, 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 ReferencesComputer access security code system Dynamic substitution combiner and extractor Scrambling/descrambling method using a memory for storing initial pseudo-random bit patterns respectively for submultiframes Patent #: 5007088 InventorsAssigneeApplicationNo. 776145 filed on 10/15/1991US Classes:713/162, Having particular address related cryptography713/155Central trusted authority provides computer authenticationExaminersPrimary: Cangialosi, SalvatoreAttorney, Agent or FirmForeign Patent References
International ClassH04L 009/00AbstractA security system for local area networks (LAN) to prevent eavesdropping of or to control access to LAN traffic at repeater or concentrator ports. The security system determines which repeater ports are to have security activated according to a given set of criteria. For ports with security activated, the contents of the data field of data frame transmitted from the repeater port to the local device are replaced with an arbitrary bit pattern.Other References
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