[kome]

"Server-client encryption is used in Cloud Chats (private and group chats), Secret Chats use an additional layer of client-client encryption."

from: https://telegram.org/faq#q-so-how-do-you-encrypt-data

[lucb1e]

Big-time Telegram user for usability reasons, but their encryption is a joke. "Server-client encryption" whose server anyway, the NSA's? It might as well be.