The 1944 Bletchley Park Cryptographic Dictionary
Codes and Ciphers
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3. (in Met.). A series of reciphered trigrams related by having the same underlying trigram.
CHAIN, v :
2. (in Met.). To relate(several reciphered trigrams resulting from different enciphering tables) by the fact that the under- lying trigram, though unknown, is the same in each case.
2. (especially in Japanese codes). A relationship between the signs forming any group of a particular code, usually of the form wA + xB + yC + zD = a constant; where ABCD are the four signs of the code-group, and wxy are positive or negative integers. Such a relationship is primari1y designed to check the correctness of the deciphered group, but it also makes the cryptographer's problem much easier.
CHI (pron. tshi), n :
2. A transposition cipher.
CHI, v :
CHI (pron. ki), a :
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