Also: adding features that expand the range of potential hacking attempts.
I'm looking at you, wireless credit cards and cars with cellular phone connections.
Airgaps are not the be-all and end-all, but they certainly help.
(I have a family member with a car that not only has a cellular phone connection, but has enough things adjustable through the "entertainment console" (instrument panel brightness and length of time before lights shut off, among other things) that I'm pretty sure it's not airgapped. (It may be communicating via a simple protocol, but, although it's better than no security, it's not the same thing as an airgap.) Quite frankly, it scares me. Not so much for me or my family personally, but the potential consequences for society in generally. I can far too easily see someone being assassinated by, say, having the ABS lock the brakes on both left tires and release the brakes on both right tires next time someone is driving down a (non-divided) highway, for instance.)
I'm looking at you, wireless credit cards and cars with cellular phone connections.
Airgaps are not the be-all and end-all, but they certainly help.
(I have a family member with a car that not only has a cellular phone connection, but has enough things adjustable through the "entertainment console" (instrument panel brightness and length of time before lights shut off, among other things) that I'm pretty sure it's not airgapped. (It may be communicating via a simple protocol, but, although it's better than no security, it's not the same thing as an airgap.) Quite frankly, it scares me. Not so much for me or my family personally, but the potential consequences for society in generally. I can far too easily see someone being assassinated by, say, having the ABS lock the brakes on both left tires and release the brakes on both right tires next time someone is driving down a (non-divided) highway, for instance.)