Topic: Tor Browser

Ultrasonic tones are being used in sporting events and concerts to coordinate phone flashes and in mobile games like Candy Crush to track ad exposure. Security experts warn that this technology can de-anonymize users on privacy-focused platforms like the Tor browser by linking a desktop session to a nearby smartphone's ID. This "ultrasonic cross-device tracking" allows advertisers to build comprehensive profiles based on environmental audio cues.

An account is provided of navigating the Silk Road marketplace using the Tor browser and Bitcoin. The site is described as a sophisticated, eBay-like operation featuring escrow services, resolution centers, and PGP encryption. Despite the anonymity of the browser, the physical delivery of pharmaceuticals and illegal substances via the U.S. Postal Service suggests the operation may be sanctioned or monitored by federal authorities to build databases of users.