Chip physical security detection device and method

Abstract

The invention discloses a chip physical security detection device and method. The circuit is applied to a physical layer protection circuit. wherein the physical layer protection circuit is divided into m groups, n covering lines in each group are parallel to each other and have the same length and width, n and m are natural numbers, the device comprises a random number generator and a signal timesequence detector, and the random number generator is used for generating a group of random numbers and inputting the random numbers into the input ends of the n covering lines in each group; The signal time sequence detector is used for selecting output signals of two or more than two covering lines in each group or amplifying signals of the output signals to carry out time sequence difference detection, and when the detected time sequence difference is larger than a preset time sequence difference threshold value, it is judged that the chip is attacked. The time sequence difference detection is carried out on the output signals or the amplified signals of the output signals of the two or more than two covering lines in each group, whether the covering lines are cut off and then are connected again is accurately judged, the safety of a chip is improved, and the attack difficulty of an FIB is increased.

Description

technical field [0001] The present invention relates to but not limited to the technical field of information security detection, and in particular relates to a chip physical security detection device and method. Background technique [0002] The intrusive attack on the chip, also known as the physical attack, refers to the information spying and malicious destruction of the inside of the chip by the attacker through physical means (such as the use of special instruments and equipment), including stripping, probes, focused ion beams, etc. (Focused Ion Beam, FIB) and so on. A common method of chip physical security protection at this stage is top layer metal detection. When the chip is subjected to physical attack, the metal wire network covered by the top layer will be destroyed, and the detection device will detect that the top layer metal is damaged and send an alarm signal. At present, the commonly used detection methods include: encrypting and randomizing the signal in...

AI Technical Summary

Problems solved by technology

Therefore, the existing chip physical security detection method cannot detect this kind of attack, and the anti-attack ability is relatively weak.

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