George Orwell wrote them, but Allen Short was the person who applied them in that way to a security context. Much of the post is apparently greatly due to Allen Short, so he deserves some mention.
For what it's worth, I applied "freedom is slavery" and "ignorance is strength" to programming back in the 90s in a rambly post on my website. I don't know if Allen ever saw it, and security wasn't much on my mind back then. (We're acquaintances, I admire him, and I'm glad to hear of this talk.)