Global Key Protection
Original Publication Date: 1985-Feb-01
Included in the Prior Art Database: 2005-Feb-18
This article discloses a host-terminal initialization procedure for loading an authentication key KA at a terminal where personal identification number (PIN) verification is to take place. KA is transmitted in a secure manner as a series of components to introduce a time component into the keyloading so as to increase the difficulty of an opponent to gain access to KA. An additional handshake procedure is also periodically provided at certain short additional time intervals (preferably randomly selected) to check whether the terminal has been removed from the network. This procedure further narrows the time frame during which an opponent may obtain access to the key. Accordingly, the terminal is connected to a host during initialization as well as at additional short handshake time intervals.