DE202007012736U1 - Lifting protection for security keyboard - Google Patents

Abstract

A Keyboard for entering PINs, PIN or access codes characterized in that the sensitive layers of the keyboard protected by a conductor protective film (B, C) that an attack on the key signals (E) and lifting off the keyboard carrier (D) can not be done without destroying the keyboard.

Description

For input PINs, PIN codes or access codes are usually PIN pads or input devices used with keyboards. The key information of these keyboards come via a so-called keyboard matrix to the evaluation. Also the evaluation the keys over Resistance or capacity changes are standard today.

From Keyboards in the area of payments or very sensitive access systems, today attack-resistant keyboards are required, which a potential Prevent attackers from accessing keyboard information, or at least should make it much more difficult.

The Receives keyboard information The attacker is relatively simple by having the relevant keyboard levels or keyboard layers removed and the buttons or the keyboard connection cable evaluates. These are customary today Used miniature electronics, which built into the keyboard and the data over Transmit cable or radio. To the installation of the attacker electronics, the keyboard is back in one optically correct condition added.

Of the in claim 1 protection invention is based on the problem to create a keyboard, which in conjunction with a transmitter the picking up of key information as well as the lifting of the keyboard prevented by the keyboard carrier.

This Problem is with the features listed in the protection claim 1 to 5 solved.

With The invention is achieved in that the keyboard by a conductor protection film so protected, that neither lifting the entire keyboard nor parts of it you possible is without destroying the conductor protective film and thus the transmitter display.

From Advantage is the protection claims 4, which indicates a piercing of the keyboard of the transmitter. This will additionally prevents an attack on the keyboard signals.

From Advantage is the protection claims 5, which is a separation of the design or labeling level of the Printed circuit protection film prevented.

A schematic representation of the invention will be with reference to the drawings View A and view B are shown.

view A shows the keyboard from the operating side.

view B shows the keyboard from the front side.

In The views are the keyboard with the keys (F), the keyboard protection foil (B, C), the tear-off tabs (C), the housing (D) with the keyboard carrier (D) and the transmitter (G) shown.

The Keys are over the tear-off tabs with the keypad protectors (B, C) (C) secured so that lifting the keyboard or individual keyboard layers (A, F) not possible is without the tear-off tabs destroyed and this is detected by the transmitter (G).

A

design and label level

B

Interconnect protective film with protective conductor tracks and tear-off tabs

C

tear tabs

D

Housing with keyboard support and transmitter encapsulated

e

key signals

F

Keys with keyboard information

G

evaluation

H

Protective conductor path

J

encapsulated Area

K

please refer A and D

Claims (5)

A keypad for entering PINs, PINs or access codes is characterized in that the sensitive layers of the keyboard are protected by a conductor protective film (B, C) such that an attack on the key signals (E) and a lifting of the keyboard carrier (D) can not be done without destroying the keyboard. Keyboard according to claim 1, characterized that the conductor protection film (B) tear-off tabs (C) on the sides which bent downwards with the evaluation electronics (G) are shed. Keyboard according to one of the preceding claims characterized in that the protective conductor (H) with the transmitter (G) is connected. Keyboard according to one of the preceding claims characterized in that the protective conductor track (H) over the entire conductor protective film (B) including the tear-off tabs (C) is tight and in the form of a meander. Keyboard according to one of the previous notes Proverbs, is characterized in that the conductor protective film (B) is inseparably bonded to the design or labeling level (A) or is so sensitive that it destroys during separation.