![]() You put the secret to be shared inside the box and then close it with the padlock and send the box back to me. I send you a small metal box which contains an open padlock. This raises the paradoxical question of “how do I securely communicate a shared secret to somebody over an unsecure network?”Asymmetric cryptography is the answer, and it’s actually very easy to understand. ![]() ![]() The big breakthrough came with the invention of asymmetric (or public key) cryptography (link).To communicate securely, both parties first need to establish a “shared secret” which is subsequently used to encrypt their messages.
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