Method and circuit for detecting clock burrs of security chip

Abstract

The invention provides a method and a circuit for detecting clock glitches of a security chip, and the method for detecting the glitches comprises the following process: setting a plaintext inputted into a plaintext register, carrying out the round number selection, carrying out the encryption of the plaintext for a plurality of times through a single-round symmetric algorithm engine according tothe round number, and obtaining an encryption result; encrypting the plaintext and the detection clock corresponding to the round number to calculate a detection result, and setting and outputting anexpected register to obtain an expected result; comparing the encryption result with an expected result, and if the encryption result is not equal to the expected result, detecting that a clock is abnormal and giving an alarm, wherein the single-round symmetric algorithm engine directly uses a single-round engine of a symmetric algorithm in the security chip. According to the method, the single-round symmetric algorithm engine of the symmetric algorithm module embedded in a security chip is used, and an existing circuit is repeatedly used; different frequency points of a clock can be detected,and clock glitches can be well detected under the condition of working clock frequency division.

Description

technical field [0001] The invention relates to the technical field of security chip protection, in particular to a method and circuit for detecting clock burrs of a security chip. Background technique [0002] With the development and application of information technology, data security is becoming more and more important. Data transmission and storage rely on the encryption function of security chips, including symmetric encryption and asymmetric encryption. [0003] With the widespread use of security chips, hackers and attackers have used various methods to attack chips, from non-intrusive side-channel attacks to intrusive attacks. This puts forward higher requirements for the anti-attack of the security chip. Only implementing encryption and decryption can no longer meet the requirements of security applications. [0004] The working environment inspection of the security chip includes detection of working voltage, working temperature, working clock, etc.; wherein the ...

AI Technical Summary

Problems solved by technology

This puts forward higher requirements for the anti-attack of the security chip. Only implementing encryption and decryption can no longer meet the requirements of security applications.

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