There are no default passwords on current version firmware - haven't been for quite a while.
SADP should show a newly-purchased camera as status=Inactive.
If it shows as 'Active', someone has already put a password on and you will need to reset the camera back to defaults with the reset button under the hatch on the body.
To 'Activate' the camera you need to create your own strong password.
Select the camera in SADP and use the Activate boxes.