Abstract
Eleven years after World War II, the new Armed Forces of the Federal Republic of (West) Germany introduced several code and cipher systems for radio communication between troops. One of the systems was the Bundeswehrtanverfahren (BT)-literally “masking procedure for military use.” The BT was intended as a fast, moderately secure system for messages transmitted by voice or Morse on HF, VHF and UHF radio channels. Though intended for all military branches, only the Air Force seems to have used the system to any great extent. The BT may be classified as a biliteral substitution cipher with variants. The German designation was “enhanced monoalphabetic substitution with variants” (erweiterter zweistelliger Caesar).
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