The 1944 Bletchley Park Cryptographic Dictionary

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SET IN DEPTH :

(of messages). Written below each other in such a way that letters or figures enciphered or reciphered by the same letter or figure of the key lie in the same vertical column.

SETTING :

1. Initial position of moving parts, especially wheels, of a cipher machine, for enciphered a particular message, determining part of key used for the enciphering.

2. Position (usually denoted by page, line, and column numbers) on a reciphering key or subtractor, especially a long subtractor, where the reciphering of an encoded message begins. Cf. Indicator.

SET-UP :

1. Arrangement or character of those parts of a cipher machine (e.g. wheel-patterns, wiring-systems) which normally remain unaltered for comparatively long periods of time (e.g. a day or month) or for the encipherment of a large number of messages.

2. (misused for Setting 1)

SHIFT :

1. Difference in position of clear language etc. in staggered messages.

2. Adder number or slide.

SHORT SUBTRACTOR :

A subtractor which is shorter than the texts it is normally employed to recipher.

SHOT :

An attempt to break an Enigma key on a crib, especially one involving the running of one or more menus on the bombe.

SHUFFLE :

(used for transpose).

SHUFFLED :

(of alphabets). Hatted or rehatted.

SHUTTLE :

Characterized by motion to and fro.

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