nagra13
This is similar to a Human entering Credentials on a Browser when challenged to login and our Credentials being sent from Browser to Server. We don't enter our encrypted passwords in Browser - right!
Currently there is no way I believe to do this as this is a generic behavior. I would point you in the direction of an Enhancement Request, however I don't see the mileage in doing that unless, someone suggest otherwise.
Please enable SSL so that any communication channel is over SSL. Additionally you could also enabled two-way SSL to further secure the data.
Regards
Hubert