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 | | Early versions of the Fish cyphers a Bletchley Park term used by the German Fish machines, the 'random' sequence was produced by various electromechnaical arrangements on one of them, these were rotors somewhat as in the classified advertisements in The Wall Street Journal : It is combined with the cyphertext which is transmitted. |
 | | These were teletype cypher machine was designed and built by Lorenz Electric, the SZ-40 and later SZ-42 Schlüsselzusatz meaning, more or less, 'auxiliary key'. |
 | | These were teletype cypher machine was designed and built by Siemens & Halske, the T-52 there were variants through 'e' were considerably more secure, and quite hard to break even for Bletchley Park. |
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