Turing's WWII Voice-Encryption Machine Delilah Detailed in Newly Auctioned Notebooks

Newly auctioned documents and notebooks detail Turing's Delilah voice-encryption project, a DIY analog speech scrambler built with assistant Donald Bayley in a rural English lab during 1944–45. The materials sold for nearly half a million dollars and offer primary-source insight into Turing's hands-on engineering methods.