Financial transaction system with secure system for checking PIN numbers, uses encryption channel between central station and customer terminal

摘要

The required message (5) is generated by a program (4) in the transmission station (1). The message is encoded (7) and then mixed (8) with a cryptographic key signal. The encrypted signal is sent via a public transmission channel (3) to the receiving station (2). The signal is demodulated in a non-secure area (9), before the crypto key is used to de-crypt the message in a secure area of the receiver.