If you don't know about something, you shouldn't have any strong opinions about it, because you will most likely be wrong, and yet you do exactly this - you doubt cryptography, which is fundamental to the modern world, because it is integral part of electronic communication and security. If some "AI", like you are saying, would crack cryptography, it wouldn't be just Bitcoin that would get affected, the whole Internet could be destroyed. So if this is what keeps you from investing in BTC, you might as well start prepping for doomsday, and you can start by withdrawing all your moneys from your bank and buying gold, guns and canned food.