Open Whisper Systems is an open-source platform focused on advancing state-of-the-art for secure communication. Signal, developed by Open Whisper Systems, is widely regarded as the most secure and easiest to use encrypted texting and calling application out there today. It's a vital tool for journalists, whistleblowers, and ordinary citizens. Using Signal, you can communicate instantly while avoiding SMS fees, create groups so that you can chat in real time with all your friends at once, and share media all with complete privacy. The server never has access to any of your communication and never stores any of your data.