Cryptography – Key management – Key distribution
Reexamination Certificate
2004-10-29
2009-02-17
Tran, Ellen (Department: 2134)
Cryptography
Key management
Key distribution
Reexamination Certificate
active
07492903
ABSTRACT:
In the method of the present invention, one of each pair of photons connected through entanglement is distributed to a transmitting station, relay stations and a receiving station. After the photons reach secure sites, such as the relay stations, a base for detecting photons is determined between adjacent sites, and then photons are detected in each site, which makes it possible to obtain a secret key used for secure information transmission between relay stations using bases coincide with each other every time. Also, in the present invention, a high-quality random number sequence serving as a secret key is automatically generated in a physical manner every time by detecting a superposition state of an entanglement and procedures corresponding to those in which a secret key itself is transmitted in a form of a quantum cryptogram are performed.
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Fujii Mikio
Ichimura Kouichi
Ohkuma Kenji
Shiokawa Noritsugu
Torii Kentaro
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Tran Ellen
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