Message anyways, just to be sure:

I need to send a message to Gorthoklek and receive a return message and verifiable authorization from him, with the literal absolute minimum of people who are not myself and Gorthoklek knowing that a message was exchanged between us, and nobody except the two of us knowing the contents of that message.  Advise me on protocols.

Message anyways, just to be sure:

I need to send a message to Gorthoklek and receive a return message and verifiable authorization from him, with the literal absolute minimum of people who are not myself and Gorthoklek knowing that a message was exchanged between us, and nobody except the two of us knowing the contents of that exchange.  Advise me on protocols.

Message anyways, just to be sure:

I need to send a message to Gorthoklek and receive a return message and verifiable authorization from him, with the literal absolute minimum of people who are not myself and Gorthoklek knowing that a message was exchanged between us, and literally nobody except the two of us knowing the contents of that exchange.  Advise me on protocols.