Chip and detection method thereof

Abstract

The embodiments of the invention disclose a chip and a detection method thereof. The chip includes a substrate, at least one laser detection circuit, and multiple key circuit modules. The laser detection circuit includes laser detection units, a NAND logic unit, and an AND logic unit. Each laser detection unit includes a monitoring diode and a first charging transistor; the anode of the monitoring diode is grounded; the input end of the first charging transistor is electrically connected with a power supply; and the cathode of the monitoring diode and the output end of the first charging transistor are electrically connected and serve as the output end of the laser detection unit. Each input end of the NAND logic unit is electrically connected with the output end of one laser detection unit, a first input end of the AND logic unit is electrically connected with the output end of the NAND logic unit, and a second input end of the AND logic unit receives an enable signal. Each key circuit module is set adjacent to at least one laser detection unit. Through the implementation of the embodiments of the invention, the accuracy of laser detection is improved, and missing detection is avoided.

Description

technical field [0001] Embodiments of the present invention relate to chip technology, and in particular to a chip and a detection method thereof. Background technique [0002] In the field of information security applications, security chips based on specific cryptographic algorithms need to provide information security protection for internal sensitive information and protect the confidentiality and integrity of information. Due to the importance of its internal information, the security chip will also be attacked in various forms, and is facing serious security challenges. [0003] At present, it is a common method for hackers to crack chips by using exception injection attack means to obtain keys, and one of the effective exception injection attack means is laser fault injection attack means. The basic principle of laser fault injection attacks on chips is the internal photoelectric effect. Lasers are usually injected into the logic area of ​​the chip and cause transien...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a chip and its detection method to solve the problem of low detection accuracy of laser detectors integrated in existing chips

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