End-to-end encryption (E2EE) is a secure communication method that ensures that only the communicating users can read the messages. In this type of encryption, data is encrypted on the sender's device and only decrypted on the recipient's device. This means that even if the data passes through intermediary servers or networks, those intermediaries (or any third parties) cannot access the content of the communication.
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End-to-end encryption protects content between specified ultimate application endpoints, rather than merely protecting transport to an intermediary that may read it. A claimed provider-excluding secrecy property requires that provider to lack the relevant decryption capability. Endpoint compromise and communication metadata remain separate issues.
