The owner of the random.org service recommends that you do not use randomly generated numbers from their website in cryptographic keys. This makes sense, but it got me wondering. Is it possible to securely transfer random values in such a way that they are still viable for use in cryptography?
They can be trivially transferred with a physical cable, but what about when such an instance is impossible? For instance, when a true random number generator is physically separated from the client which needs random numbers, and both machines are in control by the same person.
Is this practical to do securely?