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System and Method for Secured Host-slave Communication

  • US 20160098359A1
  • Filed: 12/09/2015
  • Published: 04/07/2016
  • Est. Priority Date: 09/08/2011
  • Status: Active Grant
First Claim
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1. A supply item for an imaging apparatus, comprising:

  • a processor and memory coupled thereto having stored therein program code instructions which, when executed by the processor, cause the processor to;

    following a predetermined event, determine a session identifier value;

    determine a new seed value based on a secure hash algorithm calculation on a seed value stored in the memory;

    calculate a slave random number from a predetermined number of bits resulting from a secure hash algorithm calculation on the session identifier value, the new seed value, and a serial number of the supply item;

    receive a host number from the imaging apparatus;

    calculate a session key by generating a cryptographic value using a secret key maintained in the memory and a concatenation of the host number, the slave random number, and the session identifier value, the session key being a single session key comprising a set of bits including a first subset of the set of bits and a second subset of the set of bits, the first and second subsets of the set of bits being separate from each other; and

    use the first subset of the set of bits to perform encryption and decryption operations on data to be transmitted and data received by the supply item, respectively, and the second subset of the set of bits to generate a new address value for the supply item for communicating with the imaging apparatus.

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