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De-Anonymization attacks against Proton services

  In November 2021 YesWeHack invited me to participate in a private bug bounty program organized by  Bug Bounty Switzerland on behalf of Proton AG.  The scope of the program was quite interesting and heterogeneous, as it covered most of the applications and services offered by Proton, such as ProtonMail and ProtonVPN. As a result, multiple technologies and codebases were in scope, ranging from typescript, in the open-source part of Protonmail, to .NET/Swift used by ProtonVPN apps for Windows and macOS respectively. Proton is well-known for its privacy-driven services offer, so they are based on Switzerland where the legislation seems to match Proton's requirements to provide that kind of services: thus maximizing the privacy of their communications, minimizing the amount of data they log from their users while keeping a law-abiding status.  It wouldn't be realistic to think of Proton users as an homogenous group; you may be using Proton because you're genuinely worried