Remote computer terminal security system for accessing host computer - has security circuit transmitting user identification code to host security circuit, which validates it

摘要

The system has a first security circuit connected to a calling telephone, calling MODEM and remote terminal. The security circuit has dialling and a tone and data circuits for delivering a user identification code to the host system. The latter also has a security circuit connected to the called modem and telephone. The host security circuit receives the ID code via a solid state switch and microprocessor, and compares it with a stored code. On obtaining a match, an acknowledgement signal is transmitted to the remote centre. This enables the remote terminal to be connected to the calling modem. The remote security circuit is disabled by removing a security key in the form of EPROM.