| 摘要 |
The device is an independent unit with a timer, memory and random password generator, able to store, generate, recognise and transmit passwords; store and transmit telephone numbers and recognise and retransmit permitted signals. Telephone numbers, passwords and signals may only be programmed into the device when a key is inserted into the unit and a suitable input device used. As the unit is able to effect call back procedures and recognise certain signals and retransmit them independently of the computer it protects the potential hacker is never able to gain access to the protected computer. The call back and signal screening (indirect access) function may be used jointly or independently. |
