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 ME-840 OTT cipher machine (mixer) - wanted item   The ME-840 was an off-line cipher machine for teleprinter networks (telex), developed by Mils Elektronik in Mils (Austria) in the early 1980s, as the successor to the TT-360. The machine offers unbreakable encryption, by using the Vernam principle to mix the data from a clear-text tape with the random data from a One-Time Tape. The machine was succeeded by the ME-640.   The ME-840 was the first cipher machine from Mils that could use randomly generated keys from punched paper tape (OTT) was well as from 5¼" floppy disc. The machine was housed in a standard 4U 19" rackmount system, with the (black) floppy disc drive at the front left. The image on the right was extracted from the ME-840 sales brochure, in which the various possible configurations are further explained [1].    Help required At present we have no further information about this device. Furthermore, we are still hoping to add it to our collection in due course. If you have such a device or any related information, and are willing to donate it to Crypto Museum, please contact us.   References Mils Elektronik, ME-840 Off-Line Telex Cipher System Full-colour sales Brochure. 8 pages. Date unknown, but probably early 1980s. 1 Document kindly supplied by Mils Electronic. Further information Other members of the Mils 800-family About OTP and OTT The Vernam principle 5-Level Baudot code Other Mils cipher machines About Mils Elektronik (history) Main crypto page 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: Sunday, 20 July 2014 - 10:54 CET