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POWERFUL :
(of Enigma cribs,cillies, etc.) Likely to yield solutions;
(cf. use of Good).
PREAMBLE :
1. Introductory part of cipher or code including e.g. call-sign
date, time, serial number, number of groups, address, indicator,
etc. either sent in clear before the cipher text, or partly in
clear end partly in cipher, or wholly in cipher either at beginning
of text or at some later point.
2. That part of the above, whether in clear or in cipher, which
precedes the beginning of the text of the message.
PREDICATE :
The second portion of a short message having two portions; (1) a grid
reference in one cipher, and (2) a very short message in another
cipher.
PRE-ENCIPHER :
To encipher on one cipher system prior to re-enciphering on another.
PREFIX :
A discriminant or indicator put in front of a message.
PRESTART :
(in Enigma) Applied to the indicators or the position of the wheels
before enciphering the first letter of a message as the machine in
fact moves on one position before enciphering the first letter.
PRIMARY CIPHER ALPHABET :
Any one of a series of cipher alphabets produced by sliding a basic
alphabet against a natural alphabet, two basic alphabets against each
other, or any alphabet against itself.
PROGRESSION-KEY :
Key showing in what order the different alphabets of a polyalphabetic
substitution cipher are used.
PRONOUNCEABLE, n :
An indicator-group (esp. in Enigma) forming, in its plain version, a
pronounceable sequence of letters.
PROVISIONIAL :
(of code-groups or keys) See Base.
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