The 1944 Bletchley Park Cryptographic Dictionary
Codes and Ciphers
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ANAGRAM. v :
2. (misused for). To decipher any part of a Playfair cipher, either by utilizing bigram frequencies and a knowledge of the probable plain text, or by using a previously reconstructed Playfair square or squares.
3. (misused for). To break any part of a letter-subtractor, esp. machine-cipher, depth of two or more messages by differencing and stencil-search or virtual stencil-search.
ANAGRAM KEY :
2. Systematic examination of a portion of key, esp. of a machine cipher, aimed at resolving it into its basic components.
3. (in Met.). A message containing a general description of the weather situation over a large area, e.g. Western Europe, at a particular time.
ANTI-CRIB, a :
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