Interferometric quantum cryptographic key distribution system

Details Interferometric quantum cryptographic key distribution system Interferometric quantum cryptographic key distribution system

1993-05-25

1994-04-26

Barron, Jr., Gilberto

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 44, 380 59, 359112, 359118, H04L 908, H04L 922, H04B 1018, H04B 1020

Patent

active

053074106

ABSTRACT:
An apparatus and method for distributing cryptographic key information is described incorporating a quantum channel for conveying dim and reference light pulses, a timing channel, a source of coherent light pulses, beamsplitters, a random number generator, a phase modulator and a memory for recording the phase of transmitted dim light pulses. A cryptographic key receiver is described incorporating beam splitters, a random number generator, a phase modulator, a detector and a memory for recording the phase of received dim light pulses. The invention overcomes the problem of distributing fresh cryptographic key information between two users who share no secret information initially.

REFERENCES:
patent: 4866699 (1989-09-01), Brackett et al.
patent: 4879763 (1989-11-01), Wood
patent: 4903339 (1990-02-01), Solomon
patent: 4965856 (1990-10-01), Swanic
patent: 5140636 (1992-08-01), Albares
patent: 5191614 (1993-03-01), LeCong

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