Fraud protection of communication between three elements of gambling system - using second protagonist with identification code to mediate between first with ID code and third which manages communication

摘要

The protaganist elements are respectively a card micro-circuit (5), a card receiver (1), and a central server (20) to which the card receiver is connected. The micro-circuit sends information in a first protected form with an ID code to the card receiver, which transmits the information in a second protected form with the ID code. The preferred encrypting code is DES. The server sends a redundant random number to the micro-circuit for encrypting in the first protected form using an encrypting function and an encrypting key and then to the card receiver for encrypting in the second protected form using the encrypting function and another key. The server deciphers the redundant information and compares it with the original for verification. USE - TV gambling.