Last date for submission of paper: unknown; Contact person: unknown; State nuclear enterprises are shrouded in secrecy. This fact alone makes nuclear security scholarship difficult. Yet recent scholarship has begun to explain variation in the secrecy of international politics. This panel will investigate the strategic uses of secrecy and deniability both within and between states in the nuclear domain. We will discuss the role of secrecy in coercive bargaining, the relationship between secrecy, deniability, and dual-use technologies, and assess their value and limitations in matters of nuclear security. Pauly will present ongoing research into the constructive opacity of the nuclear nonproliferation regime. Das will present evidence on the role of secrecy and deniability in the sales of nuclear delivery systems that undercut the nonproliferation regime. And Borja will present work on how uncertainty in cyberspace affects the U.S. nuclear arsenal.