Turing, Tutte & Tunny - Computerphile
Source: YouTube · Computerphile · published Oct 24, 2018 · 37:35
Colonel John Tiltman exploited a weakness in XOR-based ciphers to break the Lorenz cipher, enabling Allies to decrypt high-level German communications during WWII.
Key Takeaways:
• The Tiltman break exploited XOR weaknesses in the Lorenz cipher using "zigzag" decryption, giving Allies 3,000 characters of key material from a repeated message 00:00
• Bill Tutte discovered the wheel patterns and settings, including the critical 41-tooth Chi wheel, by identifying periodicities in the cipher when the SII wheels failed to properly mask them 07:15
• The Delta technique and Colossus computer were developed to automate statistical analysis needed to find wheel settings when Germans stopped sending indicators in the codebook 15:30
This breakthrough provided invaluable strategic intelligence, though the process still required significant manual effort from German language experts to fully decrypt messages.
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First 800 characters of the transcript
we've done one already I think called it mentioning the Toolman break and it's got to the stage now where somebody comes and says remind us what was the tilt Minh break why was it so important and so on the Tilghman break exploited a weakness in any cipher that's based on bitwise exclusive or as indeed all the Tunney traffic exactly was just that I suppose I could very briefly and not using too much notation to frighten computer scientists but just just reminder what happens with exclusive or which I'll denote with a plus in a circle and effectively what happens with it is that if you take a piece of plaintext and you add on to it a key character what you'll end up with is an insightful version of that playing character and it's all done with bitwise exclusive or and if you say well in wha…