Each side have a PRIVATE key which is never passed and a Diffie-Hellman Key (PUBLIC Key used for encryption). When both side wants to do a key exchange they send their Public Key to each other. for example Side A get the Public Key of Side B, then using the RSA it creates a shared key which can only be opened on Side B with Side B's Private Key So, EVEN if SOMEBODY intercepts the shared key he will not be able to do reverse ENGINEERING to see it as only the private key of Side B will be able to open it.

Each side have a private key which is never passed and a Diffie-Hellman Key (Public Key used for encryption). When both side wants to do a key exchange they send their Public Key to each other. for example Side A get the Public Key of Side B, then using the RSA it creates a shared key which can only be opened on Side B with Side B's Private Key So, even if somebody intercepts the shared key he will not be able to do reverse engineering to see it as only the private key of Side B will be able to open it.