A user controlled card computer C and communicating tamper-resistant part T are disclosed that conduct secure transactions with an external system S. All communication between T and S is moderated by C, who is able to prevent T and S from leaking any message or pre-arranged signals to each other. Additionally,...http://www.google.com.tw/patents/US4926480?utm_source=gb-gplus-share專利 US4926480 - Card-computer moderated systems
