Document security utilizing color gradients

Details Document security utilizing color gradients Document security utilizing color gradients

2004-11-17

2011-10-18

Reagan, James A (Department: 3621)

Data processing: financial, business practice, management, or co

Business processing using cryptography

Postage metering system

C705S041000, C705S405000, C705S408000, C705S410000, C380S051000

Reexamination Certificate

active

08041645

ABSTRACT:
The present invention includes apparatus and methods for printing and verifying postage stamps on demand via a personal postage stamp printer. The indicium by which the stamp is printed includes a color stripe and a data field including authentication data that corresponds to the color stripe. To authenticate the stamp, the authentication data in the data field is read and compared with authentication data extracted from the color stripe.

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