I imagine if you do it from a coffee shop or similar public place, then there is a good chance of being caught on CCTV. Whether the authorities will go after someone to that degree, given what they have potentially done, is another matter.
Exactly. It seems to be a point that a lot of people forget. A lot of people don't fully trust the Internet security tools, such as TOR, for anonymity. So, they try to add a layer of what is essentially physical security by using an Internet connection that doesn't track back to them. However, a lot of times people don't fully consider that at that point you must now not only secure your Internet security but physical security as well. Ie. Not be seen.
I'm not saying it is a bad idea to want to add an extra layer of security/anonymity, but it actually has to be done right. If investigators trace it back to the coffee shop and see on the CCTV that you're the only one sitting there using a laptop for the entire time the attack took place you're screwed.
Interestingly enough, all the ways to actually add that layer of physical security are potentially illegal. (depending on local laws) Obviously, the laws can vary a lot, but in a lot of places the methods a person would use to hide themselves are considered unlawful access.
Take the coffee shop for example, instead of entering the coffee shop you sit outside it. If it doesn't have cameras outside, the businesses around it very well might have one that can see you, and then there are also the people that see you. (witnesses) Okay then, long range antenna, right? Wrong, still illegal in some places. Even though it is an unsecured wifi that is meant for people to connect to it, it is meant for customers. That means that you either have to go in and buy a coffee (which shows on camera that you were in the area) or to have previously asked permission to use it which means that someone in the coffee shop must know who you are to have given you permission. This caveat actually applies to the parking lot situation too and people really have been charged before for accessing a coffee shop's wifi from the parking lot without actually going in so this isn't just a thought exercise.
Generally, if you're doing something online illegal enough to be investigated that fully, illegally accessing some coffee shop's connection is the least of your problems. There are legitimate reasons to want total anonymity though, such as whistle-blowers or individuals living in certain countries. If you're going to try for that level of anonymity it is important to know the local laws and make sure that whatever you're trying to be anonymous about is worth potentially breaking that law if it exists.
