Ideas for passing the server key for encryption to the client?

Question

Encryption

Hi all. I would like to hear from you what methods you have met and which ones are safer for passing the generated key on the server for encryption for transmission to the client. I'm interested, because my method is working, but not stable, the chance is 1 to 10 that the key will turn out to be incorrect (brute force).

and I am interested in the full dynamism of these keys. the number of bits doesn't matter.
method: symmetric block cipher algorithm

If you are interested in how my method works, I can describe it in the comments on your answer.

Answer 1

The most reliable method is not to pass the key to the client, and it is feasible: You
should use a reliable and proven trusted channel establishment scheme - a Diffie-Hellman scheme or equivalent.