[Pick-A-Hill2019]

Arm-Chair Quaterbacker response -

"In particular, Telegram encrypts acknowledgement messages, i.e. messages that encode that a previous message was indeed received, but the way it handles the re-sending of unacknowledged messages leaks whether such an acknowledgement was sent and received. "

That ^ bit is indeed of interest. Having this ability could be useful in two ways that immediately spring to mind if I were a 'james bond villain'

I am currently taking a skim through the paper which for the curious is available at https://mtpsym.github.io/paper.pdf (52 pages)

[Edit] Will leave it to those better qualified regarding the math but uhhmm yeah, A good summary is yes, there were somethings that could have been exploited and were patched by the Telegram team and a bug bounty awarded (as noted in the article). The thing I found of interest bit turned out indeed to be in the 'highly theoretical' realm. As in "only on a wet Wednesday when the wind is blowing from the west at a precise angle way"

[atatatat]

So no?