TheCodeBreakers
Floor examiners passed all messages with peculiar wording, odd-
looking marks, or other suspected indications to the security division,
which had two sections to examine steganograms concealed in the two
basic ways—linguistically and technologically. These were the code and
cipher section for the linguistic steganograms and the laboratory section
for the technological. Both were linked to T.O.D. by a security assistant
who implemented T.O.D.'s instructions and passed the more recalcitrant
problems back to Washington. The 70 examiners in the New York code
and cipher section occupied about half the 14th floor, with some of the
more expert people constituted as a specialist group. About 30
technicians tested for secret inks in the laboratory next door.
Linguistically concealed messages fall into two general categories, the
semagram and the open code. There are three kinds of open code: the
jargon code, the null cipher, and geometrical systems like the Cardano
grille
annaabi.ee 
