Back to results
US 11,531,477 B2Granted
Methods for restricting read access to supply chips
AssigneeLexmark International, Inc.
InventorsStephen Porter Bush, Jennifer Topmiller Williams
Life of this patent
Estimating the term…
Abstract
An example method for restricting read access to content in the component circuitry and securing data in the supply item is disclosed. The method identifies the status of a read command, and depending upon whether the status disabled or enabled, either blocks the accessing of encrypted data stored in the supply chip, or allows the accessing of the encrypted data stored in the supply chip.
Claims5
A method for securing data in a supply chip, comprising:
- receiving, by the supply chip, a read command from a testing device;
- upon receiving the read command, identifying a status of processing the read command;
- determining whether the status is one of disabled and enabled;
- upon a determination that the status is disabled, blocking the testing device from accessing encrypted data stored in the supply chip;
- upon a determination that the status is enabled, sending a response by the supply chip to the testing device that includes an address or region of memory storing encrypted data, and allowing the testing device to access the encrypted data stored in the supply chip;
- and
- storing the encrypted data temporarily in the memory of the testing device when decrypting the encrypted data such that no data is displayed or logged in the memory of the testing device following the decryption.
4 more elements
Dependencies are inferred from the claim text.