Fault detection circuit

Abstract

The invention provides a fault detector which is used for detecting modification of internal data of an intelligent card by various external attacks in application of high safety performance intelligent cards and stimulating corresponding protection measures to ensure that the intelligent card works in the safe and reliable state.

Description

technical field [0001] The invention relates to information security technology, is used for fault detection of integrated circuits, and is a circuit for improving the safety and reliability of sensitive circuits. Background technique [0002] In the field of information security, fault attacks have increasingly threatened the reliability and security of security chips. The methods of fault attack to induce chip error include introducing abnormal voltage or clock signal from the IO port of the chip, injecting laser light or strong light on the unpackaged chip, changing the normal ambient temperature of the chip operation, and radiating from external rays. Among them, changing the operating voltage, ambient temperature, clock signal input, magnetic field and other attack methods will introduce faults with a certain probability. This attack method cannot accurately control the time, location and type of fault occurrence. The injection of strong light or laser can more precise...

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Problems solved by technology

However, these methods are expensive in terms of computing performance or area power consumption

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