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US 2022/0021544 A1Published application
Secure Serial Peripheral Interface (SPI) Flash
AssigneeMicron Technology, Inc.
InventorLance W. Dover
Life of this patent
Estimating the term…
Abstract
A secure memory device is disclosed. In one embodiment, the memory device includes a controller configured to decode and execute commands issued by a host device; a cryptographic engine, the cryptographic engine configured to authenticate a subset of the commands, the subset of the commands each including a digital signature; and a first monotonic counter, the first monotonic counter being incremented after executing at least some of the subset of the commands, wherein a value of the first monotonic counter is used to generate the digital signature.
Claims20
A memory device comprising:
- a controller configured to decode and execute commands issued by a host device;
- a cryptographic engine, the cryptographic engine configured to authenticate a subset of the commands, the subset of the commands each including a digital signature;
- and
- a first monotonic counter, the first monotonic counter being incremented after executing at least some of the subset of the commands;
- wherein a value of the first monotonic counter is used to generate the digital signature.
2 more elements
A method comprising:
- receiving, at a memory device, a secure command from a host device, the secure command comprising a first digital signature;
- authenticating, by the memory device, the secure command by generating a second digital signature for the command and comparing the second digital signature to the first digital signature;
- incrementing, by the memory device, a first monotonic counter upon successful completion of the secure command;
- generating, by the memory device, a response to the secure command, the response including a value of the first monotonic counter;
- signing, by the memory device, the response;
- and
- returning, by the memory device, the response to the host device.
4 more elements
Dependencies are inferred from the claim text.