The 1944 Bletchley Park Cryptographic Dictionary
Codes and Ciphers
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2. (of difference). Arising from good code-groups.
GOOD DIFFERENCE :
GOOD GROUP :
2. (in a code of which the groups have known limitations). A code group which has the proper limitation and is so known to be not corrupt.
GRAMMATICAL GROUP :
1. A cage in which certain squares are blacked-out or otherwise marked
as not to be used.
2. A perforated card or disc for determining which squares of a cage are to be used or have been used.
GRONSFELD CIPHER :
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