The 1944 Bletchley Park Cryptographic Dictionary

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ENCIPHERMENT :

1. The process of enciphering or converting plain language, indicators, etc. into cipher.

2. The result of enciphering; the cipher version of a message, etc.

EN CLAIR :

1. In clear or plain language; not encoded or enciphered; (used especially of messages or parts of message, parts of preamble, indicator, date and time groups, etc., which are often or normally encoded or enciphered; also of single letters or groups which particular cipher systems leave unaltered).

2. (Misused for unreciphered).

ENCODE : v :

1. To substitute code-groups for the plain language units of (a text) according to a system embodied in a code-book.

2. (Misused for encipher).

ENCODE, n :

A code-book designed for encoding, i.e. substituting groups of figures or letters (usually of a fixed length) for any suitable units of plain language; the first part of a two-part code.


ENCODED :

Having plain language units represented by code-groups; converted into code.

END-ON :

Forming terminations; final.

ENIGMA :

1. A cipher machine using normally three of several twenty-six-circuit, stecker-wired, drums or wheels in any prescribed order-- each wheel having an alphabet-bearing tyre which is capable of being set (accord- ing to the ringstellung) in any of twenty-six positions in relation to the wiring --, an umkehrwalze or reflector wheel connecting the twenty-six circuits in fixed or variable pairs, and, in some models, an initial set (normally) of ten stecker-pairings. The right-hand wheel moves forward one position for each letter enciphered and each of the other wheels (except in some models the Umkehrwalze) moves forward one position for each complete revolution or in some models more than one position, according to the number and arrangement of the actuating teeth) of the wheel next to it on the right. See also Zusatzwalze.

2. A cipher system using the above machine, or any traffic enciphered by this.

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