End-to-End Encryption

End-to-end encryption (E2EE) encrypts data on the sender's device and decrypts only on the receiver's device. Servers relay encrypted data without holding decryption keys. LINE, WhatsApp, and Signal use E2EE.

In standard TLS/SSL, by contrast, servers decrypt and re-encrypt data. QR code images shared via E2EE apps are encrypted in transit.