quiet-js

A few years ago I made a digital audio-guide for an interactive exhibition in the form of a Progressive Web App, using a modified version of Quiet.js[0] for proximity, e.g. You enter a room, the phone mic picks up a signal playing in this room and starts an audio track synced with video projected in the room. Screenshots of the app: https://pino.ceniccola.it/portfolio/img/diconodilei-1.jpg https://pino.ceniccola.it/portfolio/img/diconodilei-4.jpg Sadly, Safari iOS Web Audio API filtered out everything above ~16khz, so instead of playing the audio at full volume in the room I had to make a few points of contact where you had to place your phone near enough a little speaker (actually a tweeter) to pick the (now) audible whisper but at much lower volume. By the way, everyone was already wearing their headphones anyway, and it worked like a c

There are a lot open source one: https://github.com/quiet/quiet-js Remember seeing them quite a bit a few years ago.

Ah, it looks like the repo linked in the article should actually be from their personal account, not their stripe account [0]. It also looks like one of the key components is the `quiet.js` library [1] which itself is an emscriptem port of `libquiet` [2]. [0] https://github.com/charliegerard/ultrasonic-payments [1] https://github.com/quiet/quiet-js/ [2] https://github.com/quiet/quiet

Also libquiet[0] / quiet-js[1]. [0]: https://github.com/quiet/quiet [1]: https://github.com/quiet/quiet-js

Currently, it does not - mainly because I've tried to use all available bandwidth (to increase the bit-rate). Please take a look at https://github.com/quiet/quiet-js for an ultrasonic data transmission.

Today I learned that you can actually abuse the system bus on some macbooks to actually send audio over AM radio[0]. Even scarier, you can do it from the browser[1]. And now this library[2] will let you open a TCP connection over the radio to download off that data machine. This is shaping up to be a pretty cool attack PoC! [0]: https://github.com/fulldecent/system-bus-radio [1]: https://fulldecent.github.io/system-bus-radio [2]: https://github.com/quiet/quiet-js

That's a cool project. For others to experiment with, there is also quiet-js that is similar: https://github.com/quiet/quiet-js

Have you seen quiet.js? https://github.com/quiet/quiet-js

Maybe this one? https://github.com/quiet/quiet-js I remember it sparked a discussion about airgap breaking.

You may be interested in https://github.com/quiet/quiet-js and https://danielrapp.github.io/spectroface/, both encode text / images over audible frequencies, but of course they sound weird. However it is technically trivial to encode "hidden" data at inaudible frequencies (>25 kHz) along with a song/whatever in the audible range and recover the data with a high pass filter. You would have to explain, however, the need for >48kHz sample rate. Another, stealthier option would be to encode information in the background noise of a recording, but this would require more complex encoding/filtering techniques.