This Article offers a new way of thinking and talking about government secrecy. In the vast literature on the topic, little attention has been paid to the structure of government secrets, as distinct from their substance or function. Yet these secrets differ systematically depending on how many people know of their existence, what sorts of people know, how much they know, and how soon they know. When a small group of similarly situated officials conceals from outsiders the fact that it is concealing something, the result is a deep secret. When members of the general public understand they are being denied particular items of information, the result is a shallow secret. Every act of state secrecy can be located on a continuum ranging between...