A dispenser for dispensing roll stock material comprises a pair of rollers for receiving the roll stock material, the pair of rollers being axially offset. The receptacle includes two control ports for accepting the two control prongs of the three-prong connector and an energy-delivery port for accepting the energy-conducting prong of the three-prong connector. A cryptography engine such as a DES engine can be decoupled from surrounding logic by using asynchronous buffers.