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Structured P2P overlays provide a framework for building distributedapplications that are self-configuring, scalable, and resilient to nodefailures. Such systems have been successfully adopted in large-scale Internetservices such as content delivery networks and file sharing; however,widespread adoption in small/medium scales has been limited due in part tosecurity concerns and difficulty bootstrapping in NAT-constrained environments.Nonetheless, P2P systems can be designed to provide guaranteed lookup times,NAT traversal, point-to-point overlay security, and distributed data stores. Inthis paper we propose a novel way of creating overlays that are both secure andprivate and a method to bootstrap them using a public overlay. Private overlaynodes use the public overlay's distributed data store to discover each other,and the public overlay's connections to assist with NAT hole punching and asrelays providing STUN and TURN NAT traversal techniques. The security frameworkutilizes groups, which are created and managed by users through a web baseduser interface. Each group acts as a Public Key Infrastructure (PKI) relying onthe use of a centrally-managed web site providing an automated CertificateAuthority (CA). We present a reference implementation which has been used in aP2P VPN (Virtual Private Network). To evaluate our contributions, we apply ourtechniques to an overlay network modeler, event-driven simulations usingsimulated time delays, and deployment in the PlanetLab wide-area testbed.

Virtual Private Overlays: Secure Group Commounication in NAT-Constrained Environments