Cryptography – Key management – Having particular key generator
Patent
1990-01-10
1990-11-20
Tarcza, Thomas H.
Cryptography
Key management
Having particular key generator
380 28, 380 13, 455 261, H04L 900
Patent
active
049724800
ABSTRACT:
A holographic device and method encrypts a time dependent data signal, s(t), by a complex time dependent phase shifting signal. This produces a new signal whose modulus is equal the absolute value of the data signal, s(t), but has widely spread the frequency of the data signal. This new complex signal is mathematically transformed, producing an amplitude and phase spectrum (or a real and imaginary transform spectrum) of signal components. The amplitude and phase signals are modulated into a radio frequency carrier (or some other radiating source) as quadrature components and transmitted. At the receiver, the quadrature signals are separated into an amplitude and phase components which are then mathematically inverse transformed. The result is a complex signal with a real and imaginary components. The resulting signal is an accurate representation of the original data signal if a complete signal is recovered. If only a portion of the frequencies transmitted are recovered, the modulus is still represents the data signal, but may have artifacts frequencies in the signal. The modulus may then be filtered to remove these artifact frequencies, recovering the reconstructed data signal.
REFERENCES:
patent: 3959592 (1976-05-01), Ehrat
patent: 4052565 (1977-10-01), Baxter et al.
patent: 4694467 (1987-09-01), Mui
patent: 4817141 (1989-03-01), Taguchi
patent: 4852166 (1989-07-01), Masson
Cain David
Charmasson Henri J. A.
General Dynamics (Space Systems Division)
Tarcza Thomas H.
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