Bad people can make your computer do the wrong things and tell the bad people about stuff they are not supposed to know. People try to make computers that only do the right things. But it is hard to tell a computer what it should do because you have to think of all the mean things that bad people can do to your computer. I figure out ways to check whether the things we tell computers to do can stop the bad people.
(Using the Up-Goer Five Text Editor, which only allows common words)