Network message security method and apparatus
November 25, 2012. 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 ReferencesDevice for encrypting each input data bit by at least one keying bit decided by a code pattern and a bit pattern of a predetermined number of preceding encrypted bits Statistical contention control for star configured communication networks Substitution permutation enciphering device Data transmission security arrangement for a plurality of data stations sharing access to a communication network Computer 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 Repeaters for secure local area networks Network message security method and apparatus Patent #: 5177788 InventorsAssigneeApplicationNo. 982217 filed on 11/25/1992US Classes:713/162Having particular address related cryptographyExaminersPrimary: 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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