Chip anti-power consumption attack circuit and method for preventing power consumption attack

Abstract

The invention relates to a circuit and method for preventing power consumption attack against a chip. The problem of power consumption attack is not solved fundamentally according to an existing method. The circuit comprises an NMOS switch, a charging capacitor, a filter resistor, a filter capacitor, a charging voltage comparator, a switching voltage comparator, a two-input AND gate and four divider resistors. When the chip is electrified, the switch is switched off, and an external power supply charges the capacitors. When the chip starts encryption and decryption operation, the switch is switched on, the inside of the chip is disconnected with the external power supply, and the circuit in the chip relies on the charging capacitor to be powered. After the electric quantity of the capacitor is reduced to a threshold, the chip stops operating temporarily, the switch is switched off, and the external power supply charges the capacitors. When the capacitors are fully charged, the switch is switched on, the inside of the chip is disconnected with the external power supply, and the circuit in the chip relies on the charging capacitor to go on working. According to the circuit and method for preventing power consumption attack against the chip, useful information contained in power consumption information is damaged, the chip protection capability is improved, and the circuit has a self active protection capability.

Description

[0001] Field [0002] The invention belongs to the technical field of integrated circuits, and relates to a protection circuit of a chip, in particular to a safety protection circuit capable of preventing power consumption attacks, and a method for preventing power consumption attacks of chips. Background technique [0003] Electronic products contain a large amount of security-related information, such as account numbers, passwords, and confidential information. This information needs to be protected by chips. The chip uses complex authentication algorithms and keys to protect the information that needs to be protected from unauthorized use. For example, use encryption and decryption algorithms such as AES to protect data. However, with the upgrade of attack technology, a class of power consumption attack methods can be easily broken through simple algorithm protection. Using appropriate instruments to measure the energy information leaked by the encryption and decryption ...

AI Technical Summary

Problems solved by technology

[0005] The existing protection measures include adding disturbance to the clock, adding redundant modules to the chip, and increasing the complexity of the algorithm

However, these technologies only increase the redundancy in power consumption information, reduce the signal-to-noise ratio of useful information, increase the difficulty of power consumption attacks, and do not fundamentally solve the problem of power consumption attacks

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