this post was submitted on 30 Apr 2024
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Public-private key signing, using up to date cryptography. That's it. It's also "quantum safe", because all cryptography used by the public goes through peer review processes.
Microsoft as well as Meta have contracted Whisper Systems, but there's no way of guaranteeing that the signing process is functionally working or if it's been broken. If it's run server side, you have no clue. If it's run client side, there's still a question if the process hasn't been tampered with in some way.
Remember: there is no such thing as cryptography with a backdoor. At that point, it's just a secrets system.