Security chip and attack detection circuit thereof

Abstract

The invention discloses an attack detection circuit for a security chip and the security chip of the attack detection circuit. The attack detection circuit comprises a sampling network, a detecting circuit and an output electrode, wherein the sampling network is used for carrying out sampling and filtering treatment on voltage burrs on a power supply and the ground and distinguishing noise signals and vibration on the power supply and the ground from the attack of the voltage burrs; the detecting circuit is used for detecting signals output by the sampling network; and the output electrode is used for treating output signals of the detecting circuit and outputting detecting results. The attack detection circuit is used for detecting the semi-invasion voltage burr attack to which the power supply of the security circuit or the ground is subjected and outputting corresponding detecting results, thus a security chip system can be warned when the power supply of the security chip or the ground is subjected to attack, appropriate security measures can be carried out by the security chip system for preventing potential safety hazards, and the fault attack resisting ability of the security chip system is increased.

Description

technical field [0001] The invention belongs to the design field of security chips, in particular to a circuit for detecting that security chips are invaded. Background technique [0002] Security chips are widely used in various fields of the information society, and their main functions include secure storage, encryption, decryption, and identification of key user data. [0003] Because of the importance of the data in the security chip, the fault attack has become one of the main attack methods to obtain the data in the security chip. Fault attack refers to making the chip work under abnormal working conditions, such as abnormal voltage, temperature, clock frequency, electromagnetic environment, etc. These abnormal working conditions may induce wrong behavior of the chip and invalidate some security operations inside the chip , causing the security measures taken by the chip to be bypassed, thereby leaking confidential data. Contents of the invention [0004] The obje...

AI Technical Summary

Problems solved by technology

Fault attack refers to making the chip work under abnormal working conditions, such as abnormal voltage, temperature, clock frequency, electromagnetic environment, etc. These abnormal working conditions may induce wrong behavior of the chip and invalidate some security operations inside the chip , causing the security measures taken by the chip to be bypassed, thereby leaking confidential data

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