The Telegram app is open-source and the encryption algorithm as well. The problem is that it uses an totally non-standard in-house developed encryption algorithm that security researchers are suspicious off (but no actual vulnerabilities are known right now).
I find it dubious for Telegram to be the most private of them all, since their encryption protocol is not disclosed, but hey…
The Telegram app is open-source and the encryption algorithm as well. The problem is that it uses an totally non-standard in-house developed encryption algorithm that security researchers are suspicious off (but no actual vulnerabilities are known right now).
They are finding problems like “crime-pizza”:
https://ethz.ch/en/news-and-events/eth-news/news/2021/07/four-cryptographic-vulnerabilities-in-telegram.html