Encryption method and device for protecting embedded algorithm of processor and storage medium

Abstract

The invention discloses an encryption method and device for protecting an embedded algorithm of a processor and a storage medium, and the method specifically comprises the steps of measuring internal RC oscillation frequencies of a plurality of chips of the same model, taking the internal RC oscillation frequencies as preset information of the chips of the model, and storing the preset information in a specific position in an external storage chip FLASH; encrypting the measured internal RC oscillation frequency of the chip and writting into an encryption program of the corresponding chip, and forming verification information; comparing the verification information with preset information, and if verification is wrong, entering an abnormal execution program; if verification is correct, measuring the internal RC oscillation frequency of the chip, comparing the internal RC oscillation frequency with preset information, and entering a normal execution state if the internal RC oscillation frequency is within an error range; otherwise, entering an abnormal execution program. According to the invention, for a chip without a preset ID, the preset ID is replaced by RC oscillator frequency discreteness to serve as a judgment basis, double-layer decoding obstacles are arranged, and the invention is high in safety, simple in processing mechanism, low in cost and higher in applicability.

Description

technical field [0001] The invention belongs to the technical field of computers, and relates to an encryption method, device and storage medium for protecting a processor embedded algorithm. Background technique [0002] In the key technology of wireless charging equipment, there are many problems to be solved, including how to ensure the impedance matching between various components, and how to accurately measure voltage and current in complex working conditions, etc. And these problems all need the algorithm of some kind of processor to assist in completing. [0003] Due to cost considerations, most current wireless charging hardware devices store the key algorithm data in the external FLASH, and the data is exposed to the outside. There is no protection mechanism for the algorithm built in the memory; The key algorithm can be obtained by means of decompilation and other means, or the storage chip can be directly removed and installed on its own device, and then run ille...

AI Technical Summary

Problems solved by technology

[0004] Some of the existing protection mechanisms can only protect the processors with a unique ID as a prerequisite for protection, but there are also many low-end processors in the market. Due to production costs and other reasons, many MCU chips do not have a unique ID function preset.

There are also some protection mechanisms with complex processing mechanisms and high hardware costs.

Images