Feature ctunnel and authentication

[Rikkit888]

Is there an option to use ctunnel not only for encrypting the tunnel, but also to do authentication with the established tunnel?

So is it possible to use a generated pair of keys to encrypt the tunnel and only allow clients to connect which use the matching key from the server. This would be very useful for tunneled applications which do not have an own authentication option.

This would look like this:

Client ------> Server
TUN1 ------> TUN1
Key1 ------> Key1

so only a client which uses the Key1 to establish a connection is allowed to connect to the server.