ATM SafetyPIN software
Potential alert system for forced ATM users / From Wikipedia, the free encyclopedia
"Reverse PIN" redirects here. For the chess term, see Skewer (chess).
ATM SafetyPIN software is a software application that would allow users of automated teller machines (ATMs) to alert law enforcement of a forced cash withdrawal (such as in robbery) by entering their personal identification number (PIN) in reverse order.[1] The system was patented by Illinois lawyer Joseph Zingher (U.S. patent 5,731,575).
SafetyPIN is not currently used in ATM systems, despite widely circulated rumors originating from a chain letter e-mail, mainly due to issues regarding palindrome PINs being incompatible with the system and potential security vulnerabilities that could arise if implemented.