Creative Crafthouse Enigma Slide Cipher - Linear Rule Cipher with Numbers & Characters The Enigma slide rule cipher utilizes classic Vigenere polyalphabetic substitution logic in an easy to use yet very secure manner. The linear design also incorporates the use of numbers, special characters, and punctuation. The instruction manual will provide examples of using the cipher as well as a helpful worksheet that you can copy and use to help encode or decode your own messages. Woods used are Cherry, maple and alder. All markings are laser engraved for both beauty and durability. The cipher measures 9.5 x 2 A series of 5 challenge messages are provided for you to try and solve. Hints are given but the messages get harder as you progress. Design by Dave Janelle & made in Hudson FL, with inspiration from the 1939 Dick Tracy Secret Code Maker