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PINCH, n
1. Action of obtaining by covert or any available methods secret
official documents, esp. cryptographic documents, of another state
or of any organisation.
2. Any secret document or collection of secret documents so obtained,
esp. when of cryptographic value.
PLAIN :
(of language).
1. Uncoded or unenciphered.
2. Decoded or deciphered.
3. (erren. for unreciphered).
PLAYFAIR
Bigram substitution system in which a key-word; or other type of mixed
alphabet of 25 letters written in a square (or two such alphabets in
different squares) with simple rules for substitution, takes the
place of bigram substitution tables.
PLAYFAIR, v :
To encipher or substitute in the Playfair manner.
PLOTTING CENTRE :
POINT-TO-POINT :
(of W/T working, esp. in G. A. F.). Occurring between two ground stations
as opposed to between ground and air or air and ground.
POLY-ALPHABETIC
(cf. substitution systems). Employing more than one cipher alphabet.
POSITION INDICATOR :
POSITIONAL :
(of external repeats). Occurring at the same distance either from
the beginning of the messages or from another repeat and so suggesting
that the messages are in depth with each other.
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