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
Systems and methods 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
In an imaging system having an imaging device and a supply item, each with a security device chip and having access to memory, a method of determining authenticity of the supply item installed and connected to the imaging device, either or both the imaging device and supply item having a conductor for passing current to the security device chips, comprising:
- generating an authentication challenge to the supply item, the challenge having one or more commands for execution by the supply item;
- transmitting the challenge to the supply item;
- receiving the challenge at the supply item;
- executing the one or more commands of the challenge at the supply item, the executing drawing the current over the conductor and generating a magnetic field;
- and
- characterizing the magnetic field, thereby indicating an authentication response to the challenge.
In an imaging system having an imaging device and first and second toner cartridges, each of the imaging device and the toner cartridges having a security device chip and having access to memory, a method of determining authenticity of the toner cartridges installed and connected to the imaging device, at least one of the imaging device and the toner cartridges having a conductor for passing current to the security device chips, comprising:
- generating in the imaging device an authentication challenge to the toner cartridges, the challenge having one or more commands for execution by the security device chips of the toner cartridges;
- transmitting the challenge from the imaging device to both the toner cartridges;
- receiving the challenge at said both the toner cartridges;
- executing the one or more commands of the challenge at the security device chips of both the toner cartridges, the executing drawing the current over the conductor and generating a plurality of unique magnetic fields;
- measuring the unique magnetic fields, thereby indicating authentication responses from said both toner cartridges to the challenge for the imaging device to determine the authenticity of said both toner cartridges.
Dependencies are inferred from the claim text.