Methods and apparatus for secure optical communications links

Details Methods and apparatus for secure optical communications links Methods and apparatus for secure optical communications links

1997-03-17

1999-01-26

Cain, David

Cryptography

Communication system using cryptography

Wireless communication

380 21, H04K 100

Patent

active

058646256

ABSTRACT:
Methods and apparatus for providing a secure optical communications link are disclosed. Communications information is encrypted with a security key. An optical beam is then modulated with both the security key and the encrypted communications information, with different modulation schemes being used for each. The dual-modulated optical beam is then transmitted to a receiver. At the receiver, the optical beam is split into first and second optical beams. First and second demodulators are then employed to demodulate the optical beams to recover the encrypted communications information and its data rate, and the security key and its data rate. The encrypted communications information, the security key, and the data rate information are then sent to decryption and timing circuitry which decrypts the encrypted communications information to obtain the original unencrypted communications information.

REFERENCES:
patent: 4901367 (1990-02-01), Nicholson
patent: 5737420 (1998-04-01), Tomko et al.
patent: 5793871 (1998-08-01), Jackson

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