The Paper Enigma by Thomas Parker Williams

My Paper Enigma, based on the rotor concept used by the German Enigma Machine, is a working cipher generating machine capable of producing cipher-text and converting cipher-text back to plain-text or understandable language. It contains three paper rotors, Red, Blue and Yellow, each with ninety divisions. Since this machine is manually operated the rotors are set by hand. Three sets of ninety ciphers each, NUMERIC, ALPHA-NUMERIC and ALPHA-ALPHA are arranged randomly over the three rotors. Three alphabets, sequential, random order and numeric, are arranged over ninety positions that correspond to the ninety positions of the index outer circle. When the red, blue and yellow rotors are aligned with a predefined key the cipher sets that appear in the sliding window can represent the plain-text letter that they correspond to. The person receiving the coded message will align their rotors in the same position as the sender's and decode the message by using the sliding window.