cjdns

"Cjdns implements an encrypted IPv6 network using public-key cryptography for address allocation and a distributed hash table for routing. This provides near-zero-configuration networking, and prevents many of the security and scalability issues that plague existing networks.

When you receive a packet of information from the Internet, it seems logical to assume that it was meant for you - that it came from the computer which it says it came from and that nobody else has read or modified it on the way. While many popular software applications are designed around these assumptions, the existing Internet does not guarantee any of them and a number of network security exploits come from the cases where these assumptions break down.

Cjdns guarantees confidentiality, authenticity and integrity of data by using modern cryptography in a non-intrusive way. Information transmitted over a cjdns network can't be altered or read en-route. While you can create multiple identities, it's practically impossible to impersonate other nodes on the network and since a node's IPv6 address is the fingerprint of its key, man-in-the-middle attacks are not possible.

Traditional networks require manual configuration of IP addresses. For one to get these addresses one must join an Internet Registry and file a lengthy application. Cjdns nodes generate their own addresses along with their keys. When two nodes find each other, they connect. When many nodes find one another, they form a network. General network architecture is of course needed to avoid bottlenecks but once the nodes are put in the right places, they will discover their roles in the network.

Cjdns is built around the bold and unproven assumption that a non-hierarchical network can scale. Cjdns uses a distributed hash table to spread the load of routing among a number of nodes, rather than requiring every node know the exact location of every other node. At the bottom layer, packets are tagged with the exact route they should take, think of it like driving directions. At the upper layer the nodes maintain and test routes to other nodes who have numerically similar IPv6 addresses to their own. Forwarding is achieved by sending a packet to physically nearby nodes who have destinations numerically close to the target address."

https://github.com/cjdelisle/cjdns

https://news.ycombinator.com/item?id=9025792

https://github.com/jMyles/cirque