We've progressed in technology since the 60s. You think we'd need something as big as the Saturn V to get to the moon? Why? I'd be willing to bet that the biggest current rockets are wide enough to house all of the lunar modules and orbiters as they were designed back in the 60s. The rest of the payload? Well, as we use new and lighter rocket fuels, the payloads do not need to be as great.
If you want to argue modern day, up to the retirement of the shuttle it was still required to use large ground shaking rockets which were for relatively short low orbit missions.
You'd need a rocket with enough force to push a moon lander, the astronauts, and all supplies to the moon and back.
Launchers for satellites are not large enough to provide enough force.
As for tracking the launch, India was actively tracking the Chandryan probe up to the point it crashed into the surface of the moon, as was the LRO mission. Those are much smaller than what would be used with a manned mission.
Further, you'd have (hopefully) something returning FROM the moon which would raise several flags among governments.
To which would be asked why the data is encrypted.