I'm David Llewellyn-Jones and this is my homepage. I'm a researcher in computer security who's also interested in programming and graphics. You might be interested in my research, my software or my random musings.

Want to know more about me? Here's a personality sketch written by a psychologist when I was in school.

“David is of high intelligence, although lacking in true creativity. He has a need for order and clarity, and for neat and tidy systems in which every detail finds its appropriate place. His writing is rather dull and mechanical, occasionally enlivened by somewhat corny puns and by flashes of imagination of the sci-fi type. He has a strong drive for competence. He seems to have little feel and little sympathy for other people and does not enjoy interacting with others. Self-centered, he nonetheless has a deep moral sense.”

Wow. Harsh. But disturbingly accurate.

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16 Apr 2018 : Publications spring clean #
There's no doubt we're well into spring now, so time for some cleaning. I'ved added three more publications. Two still in press, but the third available for download on Seamless Authentication with Pico. I'd say more about it, but I think it's probably obvious from the title. If not, it's only a one-pager.
12 Feb 2018 : Counting trees in Python #
My weekend's activity was writing a Countdown numbers game solver, with code on GitHub.
7 Jan 2018 : Undeck the halls #
There were Christmas snowflakes on the site, and there was even some real snow in the meantime, but now Epiphany has passed and the decoractions have come down. The site now has Inigo Quilez's beautiful bokeh effect as its shader-generated animated background again.
8 Dec 2017 : Christmas deco's #
See the beautiful GPU-generated random snowflakes drifting down the page? Credit goes to steverock for creating this glorious shader, released under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

Thank you Steve and Merry Christmas all!
27 Nov 2017 : Cambridge Authentication at the Cybersecurity Academic Startup Initiative Showcase #
We had a really good time at the Cybersec Academic Startups Initiative showcase day at Level 39. Here's what happened (I don't remember them playing the music through the whole day. I think they must have added it afterwards):