A private instant messaging app that has the approval of NSA whistleblower Edward Snowden has finally been released for Android devices. Signal, developed by Open Whisper Systems, has been available for iOS since 2014, combining its previous two apps RedPhone and TextSecure, and is considered the most secure messaging and voice call app available, also garnering the support of online privacy advocates the Electronic Frontier Foundation.
Signal is open source, available on GitHub, and uses advanced end-to-end encryption protocols to secure data for both sender and receiver, and allows message verification via key fingerprints and call integrity through checking matching words on both ends. The app also supports group chat, with none of the metadata related to group membership stored by Open Whisper Systems.
“As always, Signal uses your existing phone number and address book. There are no separate logins, usernames, passwords, or PINs to manage or lose,” the Signal webpage reads. “We cannot hear your conversations or see your messages, and no one else can either. Everything in Signal is always end-to-end encrypted, and painstakingly engineered in order to keep your communication safe.”
Snowden is a famous advocate of Signal, reaffirming his support following the release of the app for Android:
— Edward Snowden (@Snowden) November 2, 2015
Signal is available for download from the Google Play store now.