Signal says its systems are secure but it is taking reports of targeted attempts to hack some officials "very seriously".
TikTok tells the BBC it won't join rival platforms such as WhatsApp and Messenger in using end-to-end encryption.
The UK government sought to keep details of its row with Apple over requested access to its encrypted cloud storage tool private.
The BBC understands the dispute over accessing encrypted data is set to be heard at the High Court.
The tech giant's decision has prompted questions and concerns about reduced protections for UK iCloud users.
Thousands of messages obtained by BBC Panorama reveal the Huyton Firm’s plans for violent attacks.
The move is designed to help stop teenagers receiving inappropriate pictures, even in encrypted chats
Signs of abuse will be missed because of the encryption of messages, the National Crime Agency says.
The Home Secretary James Cleverly says he's "incredibly disappointed" by Meta's decision to automatically encrypt all messages
