The 1944 Bletchley Park Cryptographic Dictionary
Codes and Ciphers
| previous page | next page | index page |
2. The order in which the letters and/or other signs or symbols employed in a particular cipher are arranged to represent the plain language letters (and other signs, if any) in their natural order for a particular key-letter or number. This order is often "hatted" and the "hatting" may be different for each different key-letter or the ssme alphabet may be "slid" cyclically according to the key-letter; (in Enigma) the thirteen substitution letter-pairings at any given position of the wheels. See also cipher alphabet.
3. (in Enigma key-breaking when the ringstellung is known or assumed) The complete series of possible stecker for a group of letters in a chain.
ALPHABETIC, ALPHABETICAL :
2. Employing letters or groups of letters
3. (spec. of code-books). Having the code-groups so assigned to the various items of the vocabulary that when the latter are arranged in alphabetical order the former are also in their natural order i.e. in numerical order in the case of figure-groups and alphabetical order in the case of letter-groups), and so permitting both encoding and decoding to be performed with one series of equivalents; unhatted; one-part, cf. Hatted. Two-part.
ANAGRAM. n :
| previous page
| next page | index page |