System and method for distributing key

A method and system for distributing a key is provided which make use of effects of noise caused at the time of transmitting or receiving a signal to send a key. A transmission signal is amplified at a plurality of stages while the relationship between the transmission signal and noise is being main...

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Bibliographische Detailangaben
Hauptverfasser:	SHIMIZU YASUHARU, HIROTA OSAMU, SOHMA MASAKI
Format:	Patent
Sprache:	eng
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY JAMMING OF COMMUNICATION SECRET COMMUNICATION TRANSMISSION TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	A method and system for distributing a key is provided which make use of effects of noise caused at the time of transmitting or receiving a signal to send a key. A transmission signal is amplified at a plurality of stages while the relationship between the transmission signal and noise is being maintained at a level enough to satisfy predetermined criteria for security measures against eavesdropping activities, and the key is sent over a long distance. The aforementioned operation makes it possible to transmit or distribute a key over a long distance while maintaining the relationship between the transmission signal and noise at a level enough to satisfy the criteria for security measures against eavesdropping activities.