This paper by Bellovin, Blaze, Diffie, Landau, Neumann, and Rexford will appear in a forthcoming issue of IEEE Security and Privacy. A new US law allows warrantless wiretapping whenever one end of the communication is believed to be outside national borders. This creates serious security risks: danger of exploitation of the system by unauthorized users, danger of criminal misuse by trusted insiders, and danger of misuse by government agents.
I first told you about this paper in October, when I recommended an early draft. It is a follow-up on Landau's op-ed in August of last year. Risking Communications Security: Potential Hazards of the Protect America Act | 
