Cryptanalysis of the Enigma Bletchley Park to describe the network that used the same Enigma setting sheets. Initially these were recorded using coloured pencils and were given the names "red", "light blue" etc., and later the names of birds such as "kestrel". During World War II the settings for most networks lasted for 24 hours, although towards the end of the war, some were changed more frequently. The sheets had columns specifying, for each day of the month, the rotors to be used and their positions, the ring positions and the plugboard connections. For security, the dates were in reverse chronological order down the
Cracking The Code Guitarist Mick Taylor and jazz trombonist Chris Barber also appear on the album and have been long-term collaborators with Petit since their involvement in his successful campaign to "Save The 100 Club" in December 2010. Their contributions were recorded at Petit’s home studio in late 2012. Mick Taylor spoke of "Cracking The Code" to "Guitar & Bass Magazine": "I went to see Bill Wyman’s Rhythm Kings and when I went to meet Bill backstage there were a few guitar fanatics there. A few of them said "we really enjoyed your playing on the Stephen Dale Petit album" it was nice