Technologies are generally described for providing an encryption method using real-world objects. A set of parameters is collected during a first testing process. The connection bar has two strap channels to form the hand held part of the handgrip but no securing channels for the cord or other elastic member, simplifying the structure from that of another assembly which otherwise has many similar features. The cutting device is adapted to be repositioned relative to the displacement surface such that, in a first operating mode, the cutting device is retracted beneath or below the plane of the displacement surface, and in a second operating mode, the cutting device is extended above the plane of the displacement surface to cut the sheet material as it traverses the processing path.