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Maybe what people like to know is how Matrix's backup encryption is different from WhatsApp encrypted backups: https://www.whatsapp.com/security/WhatsApp_Secur

• gefhfffh 5y ago
  Thanks for the link. Actually, didn't even know that WhatsApp changed their backup mechanism, which previously used a mechanism that allowed e.g. google to obtain the messages. Overall, the concept seems to be the same: use a secret, only known to the client to secure data stored at a untrusted location. The major differences include: - closed vs open source (it's easy to validate the mechanism in the implementation whereas you pretty much need to trust WhatsApp that they don't leak the key) - WhatsApp uses a third party provider for storing the data whereas with Matrix your Homeserver is responsible for messaging and the backup - only the main app can access the backup whereas with Matrix any of your clients can independently read and write to the backup (because there is no main client) - WhatsApp stores everything in the backup, a Matrix client only the keys, because the messages are stored somewhere else