Circuit, method and chip for detecting signal

Abstract

Embodiments of the present invention provide a circuit, method and chip for detecting signals, the circuit at least includes: a delay unit and an output unit; the delay unit includes a first link and a second link, and the first link The delay of the path is greater than the delay of the second link, the first link is used to output the status signal when the signal to be tested passes, and the second link is used to output the sampling pulse when the signal to be tested passes ; The output unit is used to sample the state signal through the sampling pulse to obtain a sampling signal. The cost of the circuit for detecting the signal is low, no clock is needed, the change of the external environment can be effectively sensed, and the collected signal is stable and effective.

Description

technical field [0001] The present invention relates to the field of communications and chips, in particular to a circuit, a method and a chip for detecting signals. Background technique [0002] The security chip encrypts various information data that is easy to leak and easy to crack, and uses a high-performance and high-reliability encryption algorithm to make the information data difficult to crack and obtain, and achieve a safe and reliable interaction to protect the information and data. However, the current cracking methods of security chips are also gradually developing. The mainstream cracking methods include side channel attacks and fault injection attacks. The purpose of obtaining information is achieved by changing the working environment of the security chip or breaking the security chip to obtain keys. Therefore, a sensor should be integrated in the security chip to detect the working environment, and the sensor will issue an alarm when the environment is abnor...

AI Technical Summary

Problems solved by technology

[0003] The sensors integrated in mainstream security chips are various analog sensors such as temperature sensors, voltage sensors, clock frequency sensors and laser sensors, etc. However, the separation of sensor detection cannot adapt to various complex working environments, and local false alarms or The situation of local leakage alarm makes the detection effect of analog sensor poor

In addition, the portability of the analog sensor process is poor, and the process node of the integrated circuit is continuously upgraded. When developing a security chip based on a new circuit process, it is necessary to redesign and adjust the analog sensor circuit, which increases the cost and risk of research and development.

In addition, the scale of analog sensors is large, and some sensors are easy to be identified in the layout, and clever attackers will avoid sensors to perform fault injection attacks

Finally, the analog sensor is greatly affected by the environment, and the accuracy of the sensor will decrease when the environment changes

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