Method and apparatus for enhancing the integrity of visual authe

Details Method and apparatus for enhancing the integrity of visual authe Method and apparatus for enhancing the integrity of visual authe

1996-12-20

1999-08-03

Barron, Jr., Gilberto

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

395186, 382117, 250330, G06K 936

Patent

active

059335025

ABSTRACT:
A method and apparatus in accordance with the present invention, in response to a request for access to a secure resource, modulates an illumination light source, such as a computer display, in a pseudo-random sequence to produce time-varying light emissions that reflect off of the object being imaged by an image recognition system. The authentication system controls both the generation of the modulated light emissions and the detection of their reflection from the object, in real time. This prevents an adversary from spoofing a visual authentication system by replaying recorded images. In further aspects of the present invention, combinations of visible and infrared illuminations may be used.

REFERENCES:
patent: 4109237 (1978-08-01), Hill
patent: 4642526 (1987-02-01), Hopkins
patent: 5031228 (1991-07-01), Lu
patent: 5432864 (1995-07-01), Lu et al.

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