Fishy Codes: Bletchley’s Other Secret – Computerphile

Hitler’s High Command didn’t use Enigma, they used a faster system called Lorenz, but when Allied forces first encountered it, they had no idea what it was and code-named it ‘Tunny’ (Tuna). Professor Brailsford explains why this relates to the early days of Computer Science

Next Video in this series:

The Professor’s Notes:
Undulator Sheet:
Teleprinter Code:

Colossus & Bletchley Park:
Enigma Playlist:…
5 Hole Paper Tape:
XOR and the Half Adder:
Computer That Changed Everything:
Inside the Computer (EDSAC):

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham:

Computerphile is a sister project to Brady Haran’s Numberphile. More at

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