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| known_for = Testing the [[Enigma machine|Enigma]] encryption machine for cryptographic weaknesses.<br/>Developing a proof of the [[Gödel's compl ...Chiffrierabteilung]], and was responsible for the security of the [[Enigma machine]].<ref>{{cite journal|last1=Schmeh|first1=Klaus|title=Enigma's Contemporary ...

...r Department of the High Command of the Wehrmacht|OKW/ Chi]]) that was the cipher bureau of the supreme command of the Nazi party, and later in [[Abwehr]], t ...ryptanalytic method for breaking the Wehrmacht's own machine, the [[Enigma machine]]. Subsequently, he was commissioned to lead his own unit within OKW/Chi, w ...

| First experimental [[Lorenz cipher|SZ40 Tunny]] link started with alphabetic [[Cryptanalysis#Indicator|indicat | [[Heath Robinson (codebreaking machine)|Heath Robinson]] delivered. ...

...mmunication service encrypting or decrypting messages using the Enigma key machine]] ...ry, such as the [[Rotor machine|rotor]] [[cipher]] [[Enigma machine|ENIGMA machine]]. It was the successor to the former Chi bureau ({{langx|de|Chiffrierstell ...