Other OSs achieve better security by DESIGN
Then perhaps you ought to look at the Windows Phone design. Aside from the limited ability to do stuff that each app is constrained by (and the checking of those permissions by the marketplace publishing process) applications are isolated from each other, both in terms of memory access and file system access. What it does lack is full device encryption.
For setting it's run time parameters. I have a friend with a brain implant (from the same company). It sits on a nerve bundle and shocks it in order to stop cluster headaches. However it needs adjusting, both under his control and then it also needs proper recalibration every couple of years. He has a remote control, and the doctors can recalibrate without having to open up the back of his skull again.
However it's not wifi (and I'd be surprised if the pacemakers were either), but it does have remote connections with, ummm, yea, seemingly no authentication whatsoever,
Actually, being a brit in the US I can answer this. English cucumbers are different, it's down to variety. The US cucumbers tend to be more knobbly and thicker skinned, and need peeling. The English cucumbers are what we'd get in the UK, sold sealed in plastic, thin skinned and go in my gin and tonics.
Don't get me started on bacon.
And that's meaningless. When you submit a certificate signing request to a CA you are sending the public key of the certificate you want validated. The CA performs their checks, then signs that public key and sends it back to you, where you pair it with your private key that has never left your possession and you have a full certificate.
So copying the certificates wouldn't be a problem, heck that part of the certificate is viewable to any browser.
"Never give in. Never give in. Never. Never. Never." -- Winston Churchill