Metal wire detection apparatus and chip

Abstract

The invention discloses a metal wire detection apparatus and a chip. The apparatus comprises a random number generation module used for generating a random logic value and outputting the random logicvalue to one end of a metal wire, a sampling module used for collecting a logic value output by the other end of the metal wire, and a metal wire detection module used for comparing the logic value collected by the sampling module with the logic value generated by the random number generation module and outputting a comparison result. Through the apparatus, the random number generation module generates the random logic value, so that an illegal user cannot foreknow the logic value transmitted by the metal wire, the illegal user cannot control the logic values at two ends of the metal wire to be kept consistent when the metal wire is broken, and whether the metal wire is broken or not can be accurately detected out; and key data is erased when the metal wire is broken, so that the securityprotection of the key data is improved.

Description

technical field [0001] The invention relates to microelectronic technology, in particular to a metal wire detection device and a chip. Background technique [0002] With the rapid development of electronic terminals, dismantling means for electronic terminals emerge in an endless stream, so the security protection for key data in electronic terminals is very important. In the related technology, a plurality of metal wires (shell circle) are connected to the buckle of the electronic terminal shell, and each metal wire has a fixed logic value. If the metal wires are well connected, the logic value can be transmitted correctly. If the logic values ​​of the terminal are not equal, it means that the metal wire is disconnected, which means that the shell of the electronic terminal is damaged. [0003] Such as figure 1 As shown, there is an inverter at both ends of the metal line. If the logic value A=B at both ends of the metal line, it means that the metal line is intact and no...

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Problems solved by technology

[0004] However, the solutions in the related art have the following disadvantages: 1) Since the voltage at one end of the metal line is constant, that is to say, the logic value at one end of the metal line (that is, the end connected to VDD or GND) will not change, so Illegal users can detect the logic value at one end of the metal wire with a probe, so that the logic value at the other end of the metal wire can be simulated to keep the logic values ​​at both ends of the metal wire the same, which leads to illegal users breaking through the security protection of key data , bringing security risks to key data

2) Improve the security of key data by increasing the number of metal wires, which increases the pins of the metal wire detection device, and increases the size and cost of the metal wire detection device

Moreover, multiple metal wires are powered on at the same time, resulting in greater power consumption of the metal wire detection device

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