Projects
diapason
Your own radio, broadcast from a phone.
One person picks the music, and everyone around them plays it out loud on their own portable speaker, in sync. The phone is the link between the station and whatever speaker it drives, over Bluetooth or a cable. The more people join, the louder and wider the result.
The hard part is not sending the audio, it is agreeing on when to play it. Phones keep their own time and mobile networks are unpredictable, so holding a group tight enough that the speakers fuse into one instead of smearing is where the work went.
You create a station and get a six-character code and a QR. You point it at whatever you want to play, which can be a link, a playlist, your microphone, or just whatever your computer is playing already. Everyone else scans the code, connects their speaker, and they’re in. People who show up late land in time with the rest.
There is nothing to install and no account to create, because it all runs in the browser. It keeps playing when a phone locks its screen or drops from Wi-Fi to 4G. You can let listeners vote on what comes next instead of picking everything yourself.
I built it for bike rides.
RustaxumWebAssemblyTypeScriptAstroOpusWeb AudioPWA
Ravitools
Ravitools enriches GPX files with offline points of interest (water, food, campsites) for long-distance cyclists who lose signal exactly where they most need to know when the next tap is.
PythonGPXOpenStreetMap
Natural steganography in the JPEG domain
PhD research, 2017-2020
Steganographic embedding that models the sensor noise of a camera, so a hidden payload is statistically indistinguishable from photonic noise that was always there. The work derives a closed-form covariance matrix of the stego signal in the DCT domain, reaching high security (PE ≥ 40%) at over 2 bpnzAC.
PythonMATLABDCTSteganalysis
The scheme splits the DCT coefficients into four interleaved lattices and embeds into them in order, so that each lattice can be conditioned on the ones already written. Hover a cell below to see what it depends on:
See the publications page for the papers.