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HATTED FIGURE :
HEFT :
A set of 3-figure substitution tables used in the two main German
meteorological ciphers according to a hatted time-table and changing
every three hours.
HEXAGRAM :
Six consecutive letters or figures, especially when occurring as a
repeat.
HIGH-ECHELON :
Used by or concerning Divisional H.Q. and higher authorities.
HIGH-GRADE :
1. (of code or cipher systems). Designed to provide security, i.e.
resist breaking, for a comparatively long period or indefinitely.
2. (of Japanese Army Codes, etc.). Using enciphered indicators.
HOP OUT :
To break (an Enigma key) on a Hoppity menu.
HOPPITY :
Method of using a crib when Ringstellung of right hand wheel (and
therefore the position of the turn-over) is known, consisting in
preparing and running a single menu, instead of the usual set, e.g.
of three alternative menus designed to provide for various possible
positions of turn-over.
HORIZONTAL :
Proceeding from left to right as in ordinary reading and writing.
HST CODE :
A three-letter code, the trigrams of which are taken from the 500
spare trigrams at the end of the Heeressignaltafel.
IDENT :
Short for identification, esp. of a three-letter code-group.
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