System for authenticating modules installed in machines,...

Details System for authenticating modules installed in machines,... System for authenticating modules installed in machines,...

2008-01-22

2008-01-22

Ngo, Hoang (Department: 2852)

Electrophotography

Diagnostics

Unit or part identification

Reexamination Certificate

active

11172309

ABSTRACT:
A method of operating a machine, such as a digital printing apparatus, involves installing into the machine a module having a first random number generator associated therewith, and, incidental to installing the module, initiating a second random number generator associated with the machine. The series of random numbers from each generator are checked against each other over time.

REFERENCES:
patent: 4961088 (1990-10-01), Gilliland et al.
patent: 6986057 (2006-01-01), Cusey et al.

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