Cryptanalysis of the Enigma by the letters on the top row of the Enigma keyboard. So, "continuation of message sent at 2330" was represented as "FORTYWEEPYYWEEPY". "Cribs" were fundamental to the British approach to solving Enigma keys, but guessing the plaintext for a message was a highly skilled business. So in 1940 Stuart Milner-Barry set up a special "Crib Room" in Hut 8. Foremost amongst the knowledge needed for identifying cribs was the text of previous decrypts. Bletchley Park maintained detailed indexes of message preambles, of every person, of every ship, of every unit, of every weapon, of every technical term and of repeated
German Radio Intelligence Operations during World War II The following is a transcript of an intercept made by the RI Unit of the 252nd Infantry Division in the Gzhatsk Area on 24 February 1943. Prepared from private records in the possession of Colonel () Leo Hepp. Explanation of code designations: Left column is time. Right is message. German Radio Intelligence Operations during World War II German Radio Intelligence Operation during World War II were signals intelligence operations that were undertaken by German Axis forces in Europe during World War II. In keeping with German signals practice since 1942, the term "communication intelligence" () had been used when intercept