Public-Key Encryption Explained: Lock and Key 4K Vertical - 4K 影片檔

Public-key encryption in four steps: the recipient shares an open padlock, the public key; the sender snaps it shut on a message; an eavesdropper who copies the locked box cannot open it; and the recipient opens it with the private key that never left their device. Four-panel storyboard, calm dark navy theme, no brands. Vertical 9:16 cut, laid out for social and mobile placements.