Page 256 - The Secret War in the Italian front in WWI (1915-1918)

THE SECRET WAR ON THE ITALIAN FRONT IN WWI (1915 – 1918)

11.14 First pages of the encoding part of the "D Code", first edition (ISCAG Library)

the remarkable resistance to codebreaking. The Austro-Hungarian analysts could not decrypt the
divisional radio dispatches neither those among the many higher echelons that adopted it in 1918 .
80
It should also be noted that a ‘two-part, temporary’ trench code devised by Sacco since September
1916 was the ideal solution to overcome the drawbacks of both one-part, over-encoded books,
not always easily manageable on the frontline and to two-part codes that involved frequent
replacements, with consequent distribution difficulties.

80 The introduction and the accompanying instructions of the Code specified that it would replace the Cifrario Militare
Tascabile and the Special Code at divisional level. However, the D Code was used much more widely.

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