Personal identification number security system incorporating a time dimension

摘要

The security system includes a time dimension in an alpha-numeric personal identification number (PIN) security system to enhance its security yet maintain the familiar and simple to use PIN system. The alpha-numeric digits comprising the PIN are separated into two or more digit groups that must be entered into the system according to a predefined time sequence in order to positively identify the user and provide security clearance. The time sequence can include time delays between the entry of digit groups or time periods during which the digit groups must be entered.