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Authenticating a replaceable printer component

  • US 9,619,663 B2
  • Filed: 10/11/2016
  • Issued: 04/11/2017
  • Est. Priority Date: 05/29/2008
  • Status: Active Grant
First Claim
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1. A memory device for use in a printing system, the memory device comprising:

  • a non-volatile memory device storing a first secret;

    a logic device; and

    a communication link to communicatively link the memory device to a printer controller of the printing system;

    wherein the logic device is programmed togenerate a first session-key identifier, and an associated first session-key based on the first secret;

    provide the first session-key identifier to the printing system in response to a request from the print system to establish a communication session;

    receive a read request from the printing system, the read request including a first message authentication code calculated using a second session-key from the printing system; and

    respond to the read request by providing a response including another message authentication code calculated using the first session-key;

    wherein the logic device is programmed toin response to the read request, calculate a second message authentication code and a third message authentication code, both based on the first session-key; and

    wherein the third message authentication code is to match a fourth message authentication code of the print system, the fourth message authentication code calculated using a second session key, based on the first session key identifier and a second secret, and a cryptographic algorithm.

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