Frederic Jacobs, who worked to develop Signal, announced he is joining Apple this summer to work as an intern in its CoreOS security team. Signal is end-to-end encrypted, which means only the sender and the intended recipient can read the messages. Apple is currently fighting a US court order asking Apple to help the FBI unlock iPhone 5C of San Bernardino shooter Syed Farook. The company is working on encrypting iCloud backups that only the account owner would have access, eliminating either way for the government or hackers to expose its users data.
Source: https://thehackernews.com/2016/02/most-secure-messaging-app.html