Method of authenticating a print medium offline

Details Method of authenticating a print medium offline Method of authenticating a print medium offline

2005-05-09

2008-11-04

Nguyen, Minh Dieu (Department: 2137)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C726S026000, C380S051000, C380S055000, C705S002000, C705S075000, C455S410000, C455S411000, C358S001140, C358S001150, C358S001180, C283S017000

Reexamination Certificate

active

07447908

ABSTRACT:
A method of using a mobile device to authenticate a print medium offline before completing printing onto the print medium, the mobile device including processing means, a printhead and a sensor, the print medium comprising a laminar substrate, the method comprising the steps of: using the sensor to sense coded data provided on a surface of the substrate; using the processing means: determining, from the sensed coded data: an identity of the print medium; and at least part of a signature, the signature being a digital signature of at least part of the identity; determining, using the at least part of the signature, a determined signature; generating, using the determined signature and a public key stored in the mobile device, a generated identity; comparing the identity to the generated identity; and authenticating the print medium using the results of the comparison; and in the event the authentication step is successful, using the printhead to print onto the print medium.

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