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Date: Thu, 12 Sep 2019 18:29:22 -0400
From: notspam@...st
To: oss-security@...ts.openwall.com
Subject: Re: Telegram privacy fails again.

>IMO, If Whatsapp/Telegram wanted to take this functionality more seriously,
>they'd need to be writing the images to disk in an encrypted form from the
>outset. It increases the overhead of display, and wouldn't necessarily stop
>forensic recovery etc, but it would mean that other apps couldn't simply
>watch the directory and upload anything which appears in it in a usable
>form. That's a whole other can of worms though as it's another set of keys
>to manage.

There's no way to take this functionality seriously - the feature is a
joke. A privacy feature centered around trusting another user's
node to delete a file you already sent them is silly. Unfortunately,
it seems like nobody gets this; even Matrix clients are supposed to
have message redaction soon.

The original email didn't contain a security vulnerability (remember
the name of this list?)  - it was blogspam. It didn't belong here for
the same reason that you don't see Snapchat bugs on this list.

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