this sounds like a class project...so i don't want to be tied in with giving someone help that they're not allowed to have. so i'll try to help you come up with the idea on your own!
just try to brainstorm a bit. think of the word secrecy and what it means to you. do a stream of consciousness on it (i.e. just write for a certain amount of time without editing yourself or stopping). think about it and what images first come to mind when you think of the word and jot down some notes. do you want to use people? do you want to use still life?
if i think of some moe techniques i'll edit this post.