Date: Fri, 13 Sep 2019 12:20:45 +0100 From: Stuart Henderson <stu@...cehopper.org> To: oss-security@...ts.openwall.com Subject: Re: Telegram privacy fails again. On 2019/09/12 18:29, notspam@...st wrote: > > 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. It is still a useful feature as long as you don't consider it "secure". > 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. If a user of the software took the "delete" claim at face value then it could be considered security related .. and unlike Snapchat, the Telegram client *is* open source.
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