Editing Ultra (cryptography) (section)

===Italian===
In June 1940, the Italians were using book codes for most of their military messages, except for the Italian Navy, which in early 1941 had started using a version of the Hagelin [[Rotor machine|rotor-based]] cipher machine [[M-209|C-38]].{{sfn|Hinsley|1993a}} This was broken from June 1941 onwards by the [[Italian subsection of GC&CS]] at [[Bletchley Park]].{{sfn|Wilkinson|1993|pp=61–67}}