The metadata is stored on Signal’s servers until the messages have been sent it is then removed. Double Ratchet then manages and develops these secret keys, renewing them every few days to reduce traceability. X3DH stands for “Extended Triple Diffie-Hellman” and allows for creating a secret key between two parties. The major components in making this work are the X3DH protocol and the Double Ratchet Algorithm. This means that not even the Signal Foundation can see your messages, which has certainly earned the Signal messenger some favor ever since the notoriously invasive Facebook got their hands on the supposedly NASA-grade WhatsApp. Is Signal secure?Īs we mentioned, the Signal protocol uses end-to-end encryption. This will link both devices and allow you to use them interchangeably. However, once Signal is installed on your mobile device, you can use your mobile to scan the Signal QR code from your desktop. You can also install Signal private messenger for desktop, but it must first be registered with iOS or Android to send and receive messages. This is done by entering your phone number in the online form and then the verification code you receive via SMS. To send and receive messages on Signal, you’ll need to register your phone number.

Once the file is ready, the app guides you through a quick registration process. It’s simply a case of heading to the Google Play Store or the App Store and hitting download. The Signal mobile app is mercifully easy to install and navigate.

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