Cryptoinformation repeater, subscriber terminal connected thereto, and cryptocommunication method
Patent 5642420 Issued on June 24, 1997. Estimated Expiration Date: 
December 19, 2014. 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.
December 19, 2014. 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 ReferencesApparatus and method for cryptographic identity verification Method and apparatus providing registered mail features in an electronic communication system Apparatus, system and method for transmitting secure signals over narrow spaced channels Method and apparatus for key-management scheme for use with internet protocols at site firewalls Patent #: 5416842 InventorsApplicationNo. 358721 filed on 12/19/1994US Classes:380/30Public keyExaminersPrimary: Cangialosi, SalvatoreAttorney, Agent or FirmForeign Patent References
International ClassH04L 009/00Foreign Application Priority Data1994-03-03 JPAbstractA cryptographic information repeater installed in a system for transmitting information among a plurality of subscribers interconnected by a communication line. The repeater acts as a managing center for managing cryptokeys. Therefore, confidentiality can be effectively preserved because a common secret key is not shared by all the subscribers. When some subscriber withdraws or a new user enters, it is only necessary to update the database concentrated in the cryptographic information repeater. Therefore, if the number of subscribers increases, it will not be cumbersome to manage the data. | |
