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BBN, Harvard, and Boston University are building the DARPA Quantum Network, the world's first network that delivers end-to-end network security via high-speed Quantum Key Distribution, and testing that Network against sophisticated eavesdropping attacks. The first network link has been up and steadily operational in our laboratory since December 2002. It provides a Virtual Private Network between private enclaves, with user traffic protected by a weak-coherent implementation of quantum cryptography. This prototype is suitable for deployment in metro-size areas via standard telecom (dark) fiber. In this paper, we introduce quantum cryptography, discuss its relation to modern secure networks, and describe its unusual physical layer, its specialized quantum cryptographic protocol suite (quite interesting in its own right), and our extensions to IPsec to integrate it with quantum cryptography.

The need for scalable key management support for Mobile IP -especially, the route-optimized Mobile IP -is well known. In this paper, we present the design and the first implementation of a public hey management system that can be used with IETF Mobile IP. The system, called the Mobile IP Security (MoIPS) system, was built upon a DNS based X.509 Public Key Infastructure with innovation in certificate and CRL dispatch as well as light-weight hey generation. The system can be used to supply hey parameters for authenticating Mobile IPv.4 location management messages and to establish IPSec tunnels for Mobile IP redirected packets. It can also be used to augment emerging firewall traversal techniques for Mobile IP. A FreeBSD UNIX prototype with core@ctionality was completed at the time this paper was published 1. ~NTR~DU~~-I~N

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We have created a sensor-sharing protocol that uses cognition to increase performance by choosing protocol parameters based on the current environment and the past relationships between environment and performance. We have constructed a prototype of the protocol, and experimented with it in a four-node outdoor testbed. Our testbed is part of a larger effort, ADROIT, which seeks to create cognitive teams of software-defined radios [1]. 1