Uploaded September 2025 | Updated September 2026, 2 weeks ago

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Mike Pound codes up a demo of the length extension attach he explained in our previous video. Mike is based at the University of Nottingham.

Code link: GitHub.com/mikepound/length-extension

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at bradyharanblog.com