Authentication using magnetic field based on current drawn by security device
AssigneeLexmark International, Inc.
InventorsJAMES HOWARD ELLIS, JR., TIMOTHY JOHN RADEMACHER
Life of this patent
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Abstract
A method for determining authenticity of a security device of a component in an imaging device includes receiving, by the security device, an authentication challenge including one or more commands and executing, by the security device, the one or more commands in response to receiving the authentication challenge. A magnetic field profile is generated based on current drawn by the security device from a power source while the security device is executing the one or more commands, the generated magnetic field profile indicating an authentication response of the security device to the authentication challenge for use in determining authenticity of the security device.
Claims20
A supply item for installation in an imaging device, comprising:
- a housing;
- and
- a security chip connected to the housing, the security chip for receiving an authentication challenge including one or more commands when the supply item is installed in the imaging device, wherein when the security chip receives the authentication challenge the security chip is operative to execute the one or more commands while drawing current from a power source of the imaging device such that a magnetic field is generated around a conductor carrying the current drawn by the security chip while executing the one or more commands, the generated magnetic field indicating an authentication response of the security chip to the authentication challenge.
A supply item for installation in an imaging device, comprising:
- a housing;
- and
- a security chip connected to the housing, the security chip for receiving an authentication challenge including one or more commands when the supply item is installed in the imaging device, wherein when the security chip receives the authentication challenge the security chip is operative to execute the one or more commands while drawing current from a power source of the imaging device, and generate a magnetic field profile based on a magnetic field that is generated around a conductor carrying the current drawn by the security chip while executing the one or more commands, the generated magnetic field profile indicating an authentication response of the security chip to the authentication challenge.
A supply item for installation in an imaging device having a master controller, comprising:
- a housing;
- and
- a chip connected to the housing, the chip for receiving an authentication challenge including one or more commands when the supply item is installed in the imaging device, wherein when the chip receives the authentication challenge the chip is operative to execute the one or more commands while drawing current from a power source of the imaging device, measure a magnetic field generated around a conductor carrying the current drawn by the chip while executing the one or more commands, and send the measured magnetic field to the master controller, the measured magnetic field indicating an authentication response of the chip to the authentication challenge.
Dependencies are inferred from the claim text.