System for advanced protection of consumable or detachable elements
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United States of America Patent
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Aug 21, 2018
Grant Date -
Jan 25, 2018
app pub date -
Feb 8, 2016
filing date -
Feb 6, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A method of authenticating a consumable or detachable element of a continuous inkjet printer, (CIJ), comprising: the controller of the printer generating and dispatching a 1st item of random information to an authentication circuit of the element; encrypting the 1st item of random information by the authentication circuit using a 1st encryption algorithm and a 1st secret key to form a 1st item of encrypted random information; dispatching the 1st item of encrypted random information to the controller; encrypting the 1st item of random information by the controller using a 2nd encryption algorithm and a 2nd secret key to form a 2nd item of encrypted random information; and comparing the 1st item of encrypted random information with the 2nd encrypted item of random information. If the consumable element is authenticated, a shared key part of a 3rd key is dispatched by the consumable or detachable element to the CIJ.
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