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I'm realy a newbie in cryptography, I want to do MQTT payload encryption with AES, i've done it with PyCrypto library, but i'm still wondering how I can encrypt AES key before sending it to the subscriber, so i choose Python library called PyNacl to do that with ECC (curve25519), but i have no idea how to exchange the public key between the publisher and subscriber, have you any idea to do that ?

paulo huigo
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Public keys by definition are public (no need to keep them secret).

So there is no reason it can't be available for download via http or at a push published as a retained message on a known MQTT topic.

hardillb
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