Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1995-12-18
1996-11-12
Cangialosi, Salvatore
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 54, 380 59, H04L 900
Patent
active
055747906
ABSTRACT:
A multiple-reader system for authentication of articles uses a first reader (400) which employs predetermined modulated illuminating light (20) and a multiplicity of discriminating variables, such as wavelengths (110), amplitudes (120), and time delays (140) relative to the modulated illuminating light (20) to characterize fluorescent light (70) detected from fluorescent indicia on the articles. The fluorescent indicia may also incorporate spatial distributions such as bar codes as discriminating features. Additional readers (410 and 420), which may be readers of fluorescent marks and/or readers of other indicia, are synchronized with the fluorescence reader by timing signals. The discriminating features may be re-programmed by the user of the authentication system. Thus the discriminating features define a user-determined and programmable encryption of the articles' authentic identity. The outputs provided by individual readers (400, 410 and 420) are combined by a computer (85) programmed to produce the authentication result. The fluorescence authentication reader includes integration and synchronization of multiple readers of various types, an improved coaxial optics subsystem (450), and electronic circuitry with improved time-base stability, which cooperate in enhancing signal
oise ratio. The resultant stable triggering of the authentication output of the individual fluorescence reader, combined with time synchronization of the individual fluorescence reader with other readers, provides a reliable integrated multi-reader authentication system.
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Liang Louis H.
Marinello Daniel A.
Ryan William J.
Silverglate David
Wray Donald L.
Angstrom Technologies, Inc.
Cangialosi Salvatore
Touw Theodore R.
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