The 1944 Bletchley Park Cryptographic Dictionary

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R.D.F. :

Short for Radio-Direction-Finding.

R.E., R/E :

Short for Re-encodement (used for Re-encipherment).

READ :

To decipher or decode (messages) especially as the result of success- ful cryptographic investigation.

READABLE :

(of code and cipher systems, especially of reciphered codes). That can be read more or less currently.

READABILITY :

Extent to which cipher or code messages of a particular system can be read.

R.E.B. :

Coded form of the letters R.F.P.

RECIPHER, v :

1. To conceal the true character and figures or letters of an encoded message by applying a key or subtractor (usually by non-carrying addition or subtraction) or by any system of transposition or sub- stitution.

2. To apply a further enciphering process to a text which is already enciphered.

3. (Misused for 'encipher').

RECIPHER n :

A series of figures or letters used for reciphering; a subtractor.

RECIPHERING TABLE :

Any table used for reciphering code messages, e.g. a substitution or subtractor table.

RECIPHERMENT :

1. Process of disguising the code-groups of an encoded message by applying a key or subtractor, etc.

2. (Misused for encipherment).

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