Homepage Crypto Index Enigma Hagelin Fialka Siemens Philips Nema Racal Motorola STK Transvertex Gretag HELL Telsy TST Mils AT&T Tadiran USA USSR UK Voice Hand Mixers Phones Spy sets Burst encoders Intercept Covert Radio PC Telex Agencies Manufacturers Donate Kits Shop News Events Wanted Contact About Links Aristo Slide Ruler Educational tool for alphabet substitution One of the basic tools for learning simple cryptography is the blank slide ruler, such as the Aristo 90197 slide ruler. It was used for training new cryptanalists in basic cryptography by allowing them to play with shifted and scrambled alphabets.   The image on the right shows a close-up of a typical Aristo slide ruler. It is made of plastic and contains only vertical bars, for separation of the letters. The letters themselves should be written with a pencil. This makes the tool usable for any type of alphabet susbsitution, as well as for foreign language. Especially Russian was a very popular language during the Cold War.      Further information Caesar Box, a similar educational tool Other manual cipher systems Other cipher systems Any links shown in red are currently unavailable. If you like this website, why not make a donation? © Copyright 2009-2013, Paul Reuvers & Marc Simons. Last changed: Thursday, 12 August 2010 - 11:54 CET