Electromagnetic bypass signal acquisition device and method for USB (universal serial bus) Key

The invention discloses an electromagnetic bypass signal acquisition device and an electromagnetic bypass signal acquisition method for a USB (universal serial bus) Key. The device and the method are used for acquiring an electromagnetic bypass signal of the USB Key in the field of information security. The device and the method are characterized in that a USB interface of a computer is used for directly communicating with the USB Key, wherein a parallel port of the computer is used for triggering an oscilloscope; the oscilloscope is connected with an electromagnetic probe to acquire the electromagnetic bypass signal leaking during the running of the USB Key; the computer is connected with the oscilloscope through a network port or the USB interface to acquire signal data and store the signal data in form of file. The device and the method can be used for acquiring the electromagnetic bypass signal during the running of the USB Key.