Browse Prior Art Database

Security Grid Arrangement Totally Enclosing Keyboard Sensing Elements

IP.com Disclosure Number: IPCOM000119718D
Original Publication Date: 1991-Feb-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 83K

Publishing Venue

IBM

Related People

Dietrich, R: AUTHOR

Abstract

This article describes the concept of a security enclosure which contains the keyboard sensing elements and which effectively protects the data source against unauthorized access.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Security Grid Arrangement Totally Enclosing Keyboard Sensing Elements

      This article describes the concept of a security
enclosure which contains the keyboard sensing elements and which
effectively protects the data source against unauthorized access.

      To keep unauthorized persons from accessing secret data, such
data may be encrypted in a secure environment. An approach generally
used for this purpose consists of an electrical wire grid which is
completely closed around the sensitive components and which is
permanently monitored by an intrusion detecting circuit.    However,
in such an arrangement, the link between the data source,  which
normally has to be located outside the security enclosure, and the
security box itself is still subject to attacks.

      This article describes a concept providing for the data source,
i.e., the data entry sensor, to be arranged inside a security
enclosure, so that there is no electrical signal outside the
enclosure that might be accessed or tapped by an unauthorized party.

      A security grid is placed on the inner side of  one  of the
enclosure planes.  Tactile sensors are then mounted in direct
mechanical contact with that plane.  As the sensors are arranged
inside the electrical grid, the data source is protected against
eavesdropping.  The  sensors  sense  the pressure applied to the
outside of the security box, whereas the electrical signals are
generated inside the box.

      The basic technology adopted may be similar to conventional,
namely, membrane-type, keyb...