Interactive security system

专利名称：Interactive security system发明人：Stanley C. Rak申请号：US06/829461申请日：19860212公开号：US04642631A公开日：19870210

摘要：A circuit produces a control signal which is input through a bi- directionalcommunication device to a removable circuit. The removable circuit is set to a first logicstate which is a function of the control signal and thereafter steps through a sequence oflogic states with each logic state being a function of the previous logic state. The entiresequence of logic states is represented by a state signal or code word which is a functionof the control signal. The produced state signal is compared to a predetermined storedstate signal. Access is enabled in response to the production of a proper sequence oflogic states, as indicated by the comparison of the produced state signal to thepredetermined stored state signal. Security is improved because without knowledge ofthe control signal input to the removable circuit, an unauthorized user cannot ascertainthe code word.

申请人：RAK; STANLEY C.

代理人：Marvin S. Gittes

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