TheCodeBreakers
"), he wrote in a
report. Later in the war, a bigrapic substitution replaced the double
transposition as a front-line cryptosystem, and in 1944 a modification of
the grille replaced that. In addition, the signal troops used numerous
special ciphers—for call-signs, numbers, and so on.
The H.N.W. communications-intelligence service operated as a
separate organization within an army or an army group, though parts of
it were sometimes specially assigned. In 1943, for example, the
commander of Fernmeldeaufklarung 7 ("Radio Intelligence 7"), reported
to Field Marshal Albert Kesselring. Fernmeldeaufklarung 7 consisted of
radio intelligence companies and platoons and direction-finding stations
widely scattered over the central Mediterranean area—in western Crete,
southern France, northern Africa, Sicily, Sardinia, and Italy. These units
reported their intelligence results via their own radio net to the
headquarters at Rocca di Papa, south of Rome; the original intercepts
annaabi.ee 
