what we now mean by computation itself (with his concept of Turing Machines) in 1936. During WWII he worked as a codebreaker & with others invented the device which was finally able to crack notorious German cryptographic Enigma machine (in its more complex later incarnation)! His work undoubtedly 🧵

saved many lives, & today we recognize him as a genius & a hero. In my print, I've included a simplified diagram of the mechanism behind the Enigma with its rotors or scramblers which acted as monoalphabetic substitution ciphers, literally scrambling letters at each turn. During, his all too short 🧵