The rivalry between encrypted messaging apps Signal and Telegram has heated up, with Telegram founder Pavel Durov criticizing Signal's privacy mechanisms. Durov has a history of targeting Signal, predicting in 2017 that a backdoor would be found in their protocol within five years. Signal has been under scrutiny recently due to comments made by Signal Foundation chair Katherine Maher. Durov seized the opportunity to direct criticism towards Signal. Despite Durov's claims, Telegram does not offer end-to-end encryption by default and lacks end-to-end encrypted group chats. The feud between the two apps is expected to continue.