Dynamic signal based security protection apparatus and method and POS machine

Abstract

The technical scheme of the invention comprises a dynamic signal based security protection apparatus and method and a POS machine. The apparatus comprises a dynamic signal generating unit, an external protection unit, and a dynamic signal comparison unit. The dynamic signal generating unit is connected to the external protection unit, and output a dynamic signal to the external protection unit. The dynamic signal comparison unit is separately connected to the dynamic signal generating unit and the external protection unit, and outputs, via an output end, a comparison result of dynamic signals transmitted by the dynamic signal generating unit and the external protection unit. The method comprises the steps of: the dynamic signal generating unit providing a dynamic signal with a waveform that dynamically changes over time to the external protection unit and the dynamic signal comparison unit; the dynamic signal comparison unit receiving a reference dynamic signal sent by the dynamic signal generating unit and the dynamic signal that passes through the external protection unit; and the dynamic signal comparison unit outputs a comparison result of the dynamic signals of the dynamic signal generating unit and the external protection unit through the output end. The POS machine comprises the above dynamic signal based security protection apparatus.

Description

technical field [0001] The invention relates to a dynamic signal-based safety protection device, method and POS machine, belonging to the field of circuit tamper-proof detection. Background technique [0002] At present, the security protection of many POS in China uses the protection mechanism of static signals, that is, the level of the protection signal line is unchanged. If the trigger signal is high, it is normally low level. When it is pulled high, It will lead to the occurrence of a trigger event; a low trigger signal, which is normally high, will cause a trigger event to occur when it is pulled low. All static protection signals will be terminated at the end, and weak pull-up or weak pull-down processing will be performed at the source end (detection end). A weak pull-down is performed at the source and a strong pull-up is terminated at the end. Some protection switches (zebra strips, contacts, metal domes, etc.) will be connected in series in the middle line, whic...

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Problems solved by technology

[0003] Aiming at the shortcomings of the prior art that are easily shielded by termination and easily disturbed, the present invention adopts the method of changing the static protection signal into a dynamic protection signal, constructing a dynamic signal generation unit in the core protection area, and then passing the dynamic signal generation unit through the line Introduce it to each area that needs to be protected, and compare it with the original dynamic signal after returning to the core protection area, and judge whether the POS terminal is under illegal attack through the comparison result of the two dynamic signals

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