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Sam wants to send Jane a secret email love letter that he doesn't want Joe, Jane's jealous downstairs neighbor who piggybacks her Wi-Fi, to see.
Use Jane Private Key and Sam Private Key
Use Sam Public key and Jane Private Key
Use Jane Public Key and Sam Private Key
Sam looks up Jane's public key. He composes his ardent profession of love, encrypts it with that public key, and sends Jane his message and signs off it using Sam Private Key. In sending, copies of that message are made on Sam's email server and Jane's email server - but that message looks like a bunch of garbled nonsense. Joe the Jealous Wi-Fi Piggybacker shakes his fist in frustration when he sniffs Jane's email for any hint of a chance between them. He can't read Sam's missive.
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