Abstract: A method and computer software code for monitoring security codes generated by a security device and providing software security for an application program are disclosed. In a preferred embodiment, security software provides security for an application program by reading analog data signals representing a security code from a predetermined input port of a computer, determining whether the read analog data signals correspond with an expected security code, and enabling or disabling the protected application program based upon whether the read analog data signals correspond with an expected security code. In a preferred embodiment, the analog data signals are resistance values, and the predetermined input port of a computer is a game port. In a preferred embodiment, multiple sequences of resistance values, a combination of which form a security code sequence, are presented to the analog pins of a computer's game port.

Abstract: A system, method and apparatus for generating security codes that may be used in providing software security are disclosed. In a preferred embodiment, at least one analog data signal representing a security code is generated by security circuitry. Such analog data signal is input to an analog input port of a computer. The generated security code may be used to prevent unauthorized operation of a software program. In a preferred embodiment, such an analog data signal is a resistance value, and such an analog input port of a computer is a game port. Most preferably, multiple sequences of resistance values are generated and input to the analog pins of the game port. A combination of the multiple sequences of resistance values form a security code that may be used to provide software security for a software program. Additionally, one or more confounding signals may be generated to make decoding the security code more difficult.