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RESUBSTITUTION :
A second or subsequent substitution carried out on the top of a
previous one.
RETROFLECTION :
Process whereby each of a series of numbers in numerical order is
associated with one of another series in the reverse order (i.e. the
smallest in the first series with the largest in the second), the
second series being a continuation of the first, but written in
the opposite direction.
REVERSE v :
REVERSED :
(of standard cipher alphabets) In which the clear and cipher
components run in opposite directions.
REVERSIBLE :
(in Playfair systems) An equation of a clear bigram with a (different)
cipher bigram which is still true when the bigrams are interchanged.
REVOLVING STENCIL :
A square stencil designed to disclose a different set of squares at each
of three successive turnings through 90 degrees.
R.F.P. :
Short for Radio Finger Print.
RHYTHM :
(in transposition) A recurring series of differences between sets of
adjacent or similarly spaced terms of an anagram key.
RIMA :
(in Enigma) A crib suggested to B.P. by the Naval Section at
Washington (reverse of amir).
RINGSTELLUNG :
Position of alphabet-bearing tyre on wheel of Enigma machine, defined
by number or letter at which a clip is set.
RINGSTELLUNG CUT OUT :
A running of a bombe with a restriction on the range of possible
Ringstellungen.
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