System and method for distributing key

Cryptography – Communication system using cryptography – Fiber optic network

Reexamination Certificate

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C380S278000

Reexamination Certificate

active

09971077

ABSTRACT:
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.

REFERENCES:
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patent: 5850441 (1998-12-01), Townsend et al.
patent: 6271946 (2001-08-01), Chang et al.
Shor, P. (1996)Polynomial-Time Algorithms for Prime Factorization and Discrete Logarithms on a Quantum Computer, Factoring with a Quantum Computer, arXiv:quant-ph/9508027v2, Jan. 25, 1996, pp. 1-27.
Neilsen, M. A. and Chuang, I. L.,Quantum Computations and Quantum Informatics, pp. 36-39, 226-227.
Bennett, C. H. and Brassard, G.Quantum Cryptography: Public Key Distribution and Coin Tossing, International Conference on Computers, Systems and Signal Processing. Bangalore, India Dec. 10-12, 1984. pp. 175-179.
Yuen, H. P. and Kim, A. M.Classical noise-based cryptography similar to two-state quantum cryptography, Physics Letters A 241 (1998) pp. 135-138.

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