FBI's ability to legally access secure messaging app content and metadata [pdf]

Re:FBI's ability to legally access secure messaging app cont... by Andrew_nenakhov on Tuesday November 30, 2021 @06:04PM (#29398569)

"Encrypted OVER THE WIRE and AT REST" means that telegram has easy and unfettered access to chat logs. So they can give it up to authorities. (I don't argue that they DO, just that they very much CAN).

This is proven by an extremely simple experiment: you log in on your new phone, enter password and instantly see all chats.

Another simple experiment points that chats are unlikely to be even encrypted at rest is that Telegram has an extremely fast server side message search. You log into a web client, half a second later you can type a search query and uncover chats from years ago.

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Re:FBI's ability to legally access secure messaging app cont... by nicce on Tuesday November 30, 2021 @06:43PM (#29398905)

It kinda depends on if images and videos are encrypted separately and only indexed at first.

How much data there are on your chats? 1 megabyte is around one thick book in plaintext.

AES-CBC as example method decrypts more than 2 gigabits per second with hardware opcodes (2012 processor), for example if we look this data https://www.bearssl.org/speed.html

It is impossible to say based on delay when searching plaintext on this level whether there is encryption.

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