| previous page
| next page | index page |
- 92 -
UNRECIPHERED :
( of a code-book or code-groups) Used or sent without recipherment.
VALUATION SYSTEM :
System for evaluating or computing code-groups which have a
characteristic limitation. Cf. garble-table.
VALUE LIMITATION :
Feature of code-books or code-groups where the individual units of
each group when combined by a given formula have a constant sum or
value. Cf. Characteristic.
VALUE SYSTEM :
VERTICAL :
(of letters, figures, etc.). Written or lying under one another in
columns and not side by side in lines.
V.H.F., V/H/F :
Abbreviation of Very High Frequency.
VIENNISMUS :
A practice, observed in a series of Enigma messages originating from
Vienna, of assigning successive outside indicators which formed a
sequence( e.g. ARN, BSO, CTP), and simultaneously using a different,
but similar, sequence of message settings (e.g. KCV, LDY, MEX);
(cf. Berlinismus).
VIGENERE ENCIPHERMENT :
Encipherment by means of an alphabetic key and a Vigenere table.
VIGENERE TABLE :
A square table consisting of twenty-six cyclic alphabets, each
successive line or column being slid one back from the previous line
or column, used for combining letters of plain language and letters
of key in certain types of poly-alphabetic ciphers. Letters are
added by finding the line with one of them at its left end and the
column with the other at its top (or vice versa) and taking as the
sum the letter common to such line and column. Letters are subtracted
from each other by finding the line with the letter it is desired to
subtract at its left, the letter it is desired to subtract this from
on this line, and reading off the result at the top of the column in
which this occurs, or vice versa i.e. proceeding down a column and
then leftwards along a line.
| previous page
| next page | index page |
