Abstract: A keyboard module adapted for connecting with a security unit is provided. The keyboard module includes a bottom plate, a plurality of buttons and a flexible circuit board. The buttons are disposed on the bottom plate, and the flexible circuit board is disposed between the bottom plate and the buttons. The flexible circuit board has a wire mesh circuit. The wire mesh circuit is adapted for electrically connecting with the security unit, so that the security unit generates a trigger signal while the wire mesh circuit is broken.

Abstract: An apparatus to prevent smart cards from being read illegally is provided, wherein the apparatus is installed in a smart card reader comprises a CPU and a socket with a plurality of fingers, and the apparatus comprises: an electric circuits board (ECB), an inner circuit and a supplementary circuit. The ECB is disposed to cover the fingers and wired with an inner circuit electrically connected to a power supply. The supplementary circuit has an input terminal and an output terminal, wherein the input terminal is electrically connected to the power supply through the inner circuit of the ECB, and the output terminal is electrically connected to the CPU of the smart card reader; when the inner circuit is interrupted, an alarm signal is outputted by the supplementary circuit to the CPU to terminate the reading of the smart card by the smart card reader.