Security access control method for chip storage circuit

Abstract

The invention discloses a security access control method for a chip storage circuit. Based on a nonvolatile storage circuit, subarea access control is conducted, an authentication and access control circuit is designed for each subarea, the authentication and access control circuits all skip in a mode of a state machine, authentication and access control signals under different states are output, and authorized access of the storage circuit is achieved. Two levels of authentication of identity authentication and access control authentication are adopted and finished by pure hardware circuits, and higher safety is achieved. The method is applicable to application specification integrated circuit (ASIC) chips and SoC chips of an integrated nonvolatile storage, even other circuit systems with the nonvolatile storage.

Description

technical field [0001] The invention belongs to the field of safety protection design of a non-volatile storage circuit in a chip, and in particular relates to a method for controlling security access of a chip storage circuit. Background technique [0002] For the chip, its most important protection objects are usually stored in the non-volatile memory of the chip, such as user sensitive data, software execution code, various operating data and system status information generated during runtime, etc., so it is not volatile Volatile memory is the key protection object of chip security protection. The protection of non-volatile memory focuses on ensuring authorized access to memory circuits and resisting layout analysis. The security access control circuit described in the present invention just realizes the authorized access to the storage circuit. [0003] The so-called authorized access to storage circuits includes two layers of meaning. The first layer of meaning means ...

AI Technical Summary

Problems solved by technology

For SoC chips, due to the availability of CPU resources, most authorized access control circuits use a combination of software and hardware, such as reading the authentication code into the CPU, and the CPU performs the comparison of the authentication code. This authentication method is simple and easy to implement. , but there is a risk of being attacked by software. The attacking software can control the CPU to perform a false comparison, or force the comparison to pass, so as to obtain the corresponding access rights through identity authentication

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