Patent ID: 8772653

Claim:
An encryption keyboard, comprising a panel and a main control board, wherein: a sealed flexible circuit board is provided between the panel and the main control board; an anti-probing detection circuit is provided in the sealed flexible circuit board; and the anti-probing detection circuit is connected to a surface of the sealed flexible circuit board via a circuit pin, and electrical connection is formed via the circuit pin between the anti-probing detection circuit and a control circuit of the main control board which implements a self-destruct function; and a backing plate is provided between the sealed flexible circuit board and the main control board; a through-hole is formed in the backing plate correspondingly to the circuit pin; and the through-hole is adapted to contain conductive rubber, and the electrical connection between the anti-probing detection circuit and the control circuit of the main control board which implements the self-destruct function is formed via the circuit pin by the conductive rubber; and a water-resistant silica gel plate is provided between the panel and the sealed flexible circuit board; and the encryption keyboard further comprises a lining plate between the panel and the water-resistant silica gel plate; a plurality of key holes are formed on the panel, the lining plate, the water-resistant silica gel plate, the sealed flexible circuit board and the backing plate; a plurality of keys are mounted in the key holes; each of the keys comprises a key cap and a push rod; the push rod comprises a first end connecting with the key cap, and a second end penetrating through a key hole to contact with and push a key contact on the main control board; the key cap comprises a cap top, and a container on the lower surface of the cap top and having a downward opening; and the key cap joins with the first end of the push rod via the container, and the first end of the push rod has a diameter smaller than an inner diameter of the container.