TheCodeBreakers
cryptographic compromises. Referat lib: development of German
cipher systems (camouflage methods, secret writing, secret
telephony); supervision of and instruction in cipher production.
Referat He: cryptographic systems for radio agents.
Gruppe III: Cipher Supply. Control of production, printing, and
distribution of ciphers and keys; operation of the distribution posts
(headquarters at Dresden with depots in Halle, Zwickau, Chemnitz,
Leipzig, Frankfurt-am-Oder, Bischofswerda, Magdeburg, and
Reichenbach).
Gruppe IV: Analytical Cryptanalysis. Referat IVa: testing of
suggested German military cryptosystems and telephone
scramblers for resistance to crypt-analysis: examination of
inventions. Referat IVb: development and construction of
cryptanalytic apparatus for Wehrmacht cryptanalytic units;
operation of the equipment at Chi. Referat IVc: development of
cryptanalytic methods; stripping of superencipherments for
Gruppe V. Referat IVd: instruction.
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