Unpredictable bit stream generator

Details Unpredictable bit stream generator Unpredictable bit stream generator

1986-06-25

1988-09-06

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 102

Patent

active

047697776

ABSTRACT:
An apparatus for breaking the periodicity of the pseudorandom bit stream output from a linear sequence generator. The apparatus includes a ring oscillator which periodically corrupts the sequence of the generator. The level of the supply voltage applied to the logic elements of the ring oscillator is varied over time, thereby altering the oscillator output frequency. In a second embodiment, the temperature of the logic elements of the ring oscillator is varied over time, thereby also altering the oscillator output frequency. A system comprising four of the above-disclosed apparatus having different linear sequences and different corrupting influences, are multiplexed, wherein the multiplexing selection criterion is determined by a logical combination of the four linear sequences.

REFERENCES:
patent: 3614400 (1971-10-01), Farnett et al.
patent: 3986168 (1976-10-01), Anderson
patent: 4318008 (1982-03-01), Nall
patent: 4365145 (1982-12-01), Frentress
patent: 4396894 (1983-08-01), Willmore
patent: 4450321 (1984-05-01), Quigley et al.
patent: 4694412 (1987-09-01), Domenik et al.

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