How Signal Protocol Secures Billions of Messages Using Double Ratchet Encryption

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The Signal Protocol, originally developed by Open Whisper Systems in 2013, is the encryption standard powering Signal, WhatsApp, Google Messages, and Skype's Private Conversations. Created by Moxie Marlinspike and Trevor Perrin, it was designed to enable strong encryption for asynchronous messaging where both parties need not be online simultaneously. The protocol starts with an Extended Triple Diffie-Hellman (X3DH) handshake, which establishes a shared secret between two parties even before they have communicated, allowing sessions to be initiated while the other user is offline. Following this handshake, the Double Ratchet Algorithm takes over, combining asymmetric Diffie-Hellman ratcheting and symmetric key ratcheting to generate a unique encryption key for every single message. This dual-ratchet design ensures both forward secrecy — protecting past messages if a key is compromised — and future secrecy, allowing the system to recover security even after a partial compromise.

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