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end-to-end encryption

End-to-end encryption is a method that lets only the endpoints of a communication read its content, not intermediaries.

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End-to-end encryption encrypts content at one endpoint of a communication and decrypts it only at the other, so servers or providers relaying the data cannot read it. Unlike transport encryption such as TLS, which is decrypted at intermediate servers, the decryption keys are held only by the endpoints.

It is widely used in messaging apps such as Signal and WhatsApp, with the Signal Protocol as a prominent implementation.

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…this design, data traveling between a device and the cloud uses Signal Protocol end-to-end encryption, which protects the data in transit between the endpoints.

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