Browse Prior Art Database

Safety Mechanism for Cryptographic Terminal

IP.com Disclosure Number: IPCOM000040545D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Baumhauer, V Mickeler, J Roscher, P Schilling, M [+details]

Abstract

For protecting the storage content of a cryptographic terminal, a safety mechanism is provided. This safety mechanism consists of a safety lock that mechanically locks base and cover of the terminal and which, when opened, actuates an electric microswitch. By short- circuiting the voltage input of a battery-buffered storage, the actuated switch erases the storage content. When data to be protected, such as cryptographic code, are initially and repeatedly loaded, the safety lock is actuated to test the proper functioning of the entire safety mechanism. Data to be protected are read in and stored only after this test has been made. The safety lock must also be actuated for authorized removal of the cover from the base, which invariably causes the storage content to be erased so that subsequently the storage has to be reloaded.