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Is Telegram really an encrypted messaging app?
(blog.cryptographyengineering.com)
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this post was submitted on 25 Aug 2024
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Yes, because the "encrypted messenger" metric is about sending and receiving messages, not storing messages. On the order of things I care about, E2EE is much more important than local storage. I can do something about local storage, I can't realistically do anything about E2EE.
So whether or not the messages can be retrieved by criminals or law enforcement is not a metric. Got it!
Law enforcement would require a warrant, and criminals would need to break into my device first (highly unlikely without it being a targeted attack, and that's not in my threat model at all).
And if they can break the encryption on my devices, they can likely break the encryption of the data at rest. Most people would probably use the same key for both anyway (biometrics or a PIN). If I need it to be more secure, I can create a special encrypted container for that service to store its data in.
You can enable secret chat. Like press the button. But that's probably too difficult compared to encrypting you devices.
Sure, but what happens when my contacts forget to push it and send me confidential information? I can be the most careful person in the world and always press that button, but I cannot control what others do. That's why it needs to be E2EE for everyone.