Abstract: Content and/or Path locality may be obtained using DHT protocols by assigning network nodes with individual node identifiers (IDs) in a hierarchical namespace. The hierarchical node IDs may be assigned to reflect organizational boundaries within the network. Therefore, with the structured overlay defined using these hierarchically assigned node IDs, a routing algorithm that uses prefix-matching can provide path locality. Furthermore, a domain prefix may be combined with data identifier derived from the data itself to create an enhanced data key. The use of the enhanced data key with a DHT protocol in this structured overlay can provide content locality.

Abstract: Substantially accurate estimation of coordinates of a subject network node in a coordinate space is accomplished by considering designated coordinates of other positioned nodes within the network. The designation of coordinates in the coordinate space to such nodes allows the computation of predicted coordinate distances between two network nodes based on the coordinates. By optimizing the network distance errors between measured distances and predicted coordinate distances, the predicted coordinates of a subject node joining the network can be iteratively refined. With these estimated coordinates, the coordinate distance between two points in the space may be computed as a prediction of the network distance between the two corresponding nodes. Furthermore, coordinate-based coordinate estimation lends itself to security precautions to protect against malicious reference nodes or external interference.