Is it important to go to grad school/get PhD for AI or security?

[prafiate]

I am a freshman at university of maryland doing a computer science major I have choices of different areas of specializations when I get to my last two years of college. I am split between Artificial Intelligence or Security. Would both require that I go to graduate school and maybe get a PhD? or would it help if I did choose to persue a PhD? I am asking because I know that most who specialize in software engineering or gaming never go to graduate school because it's not as important for their feild. I was wondering if this was the same case for AI or Security.