Not to belittle your condition, but seriously, this is what you are worried about? Someone hacking your ICD? Dude, I would be much more worried about it failing on its own, or getting hit by a bus, or struck by lightning, or any one of about a million other things that are way more likely than somebody hacking your ICD. The string of improbable events that would have to happen are almost unimaginable. First, the person would have to know you have an ICD. How many people in the world actually know this? Maybe 50 or 100. Let's be generous and say it is 1000. Second they would have to give a shit about that. How many of those thousand actually would give a shit about it? Again, I will be generous and say 100. Third, they would need a reason to want to hack your ICD. How many of those 100 people would have a reason to hack your ICD? I will be generous and say 10. Fourth they would need to have the skills to hack your ICD and fifth they would need to have the equipment to hack your ICD. Out of those remaining 10 people the chances that they have the skills and equipment necessary to hack you ICD are only a Planks length greater than zero. If you didn't describe how you had the heart condition your entire life I would have suggested a possible source as chronic anxiety.