The 1944 Bletchley Park Cryptographic Dictionary

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CLICK BOOK :

A catalogue giving under every constatation the constatations for the next position on the same pair of rods in each case as the constatation concerned, together with an indication of the position on the rods where the consequent constatation occurs.

CLICK MACHINE :

A machine designed to test short Enigma cribs at any desired number of positions in a message (assuming no turn-over of second wheel within the length of the crib), and distinguishing possible positions from positions which involve contradictions.

CLONK, v:

1. To turn over by hand the wheels of two Enigma machines simul- taneously (the machines being coupled to the same lamp board and set at the requisite interval) in the process of testing for ringstellung on a limited range on two constatations; also, to turn over the wheels of a single machine in searching for the position that gives a particular constatation in a similar investigation of ringstellung or message-setting, esp. in the case of duds.

2. To test for or solve ringstellung by the above method.

CLONK :

A search for ringstellung by the method of clonking.

CLOSE SPELL :

A code-group marking the end of spelling.

CLOSURE :

(in Enigma). A constatation linking together directly two letters otherwise connected by (a part of) a chain, esp. in a menu.

COASTAL CODE :

A code used mainly by harbour defence vessels and Naval coastal- batteries.

CODE :

1. A substitution system having groups (usually of a fixed number, e.g. 3, 4 or 5, of letters, figures, or letters and figures) as the equivalents of words, syllables, letters, numbers, punctuation marks, etc., common phrases and even whole sentences of plain language. These words, syllables, letters, phrases, etc. are arranged in a consultable (i.e. alphabetic or other logical) order in a code-book with the equivalent code-group or groups

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