There's a paper in the Feb. '93 _IEEE Transactions on Software Engineering_: "Trust Requirements and Performance of a Fast Subtransport-Level Protocol for Secure Communication" by P. Venkat Rangan It's about a protocol called Authenticated Datagram Protocol, and issues about using it in a "subtransport level." He's tried it on Suns. The work was done at Berkeley in 1990, the guy's at UCSD now. -fnerd