Crypto FAQ: What is End-to-End Encryption (E2EE)?

End-to-End Encryption (E2EE) is a term used to describe a communication system where the only the sender (the origin end) and the recipient (the destination end) of a message, and no intermediaries, can read the subject message, which is rigorously encrypted throughout its transit from the origin end to the destination end. When end-to-end encryption is properly implemented, only the sender and the recipient of the message possess the cryptographic keys needed to decrypt the message—even the intermediate message service has zero knowledge of the cryptographic keys required.