End-to-End Encryption Explained: Server Can't Read It 4K Vertical - 4K 影片檔

A chat message travels from one phone to another through a messaging server. The keys live only on the two devices, so the message is encrypted on the sender's phone, the server relays ciphertext it cannot read, and it is decrypted only on the recipient's phone. A view under each party shows what it can actually see. Calm dark navy theme, placeholder ciphertext, no brands. Vertical 9:16 cut, laid out for social and mobile placements.