According to the design principle and method of security architecture for information systems,the security architecture model of space Internet is proposed on the basis of an analysis on security threats,security requirements and security mechanism of space router.

It allows each federate to decl are its publishing regions and subscription regions in a routing space,in order that the exchanged data between federates can be reduced.

Considering the characteristics of spatial data,the P2P-based spatial query routing algorithms were summarized such as the interests-sharing algorithm,and the Chord-based algorithms that have four typical patterns: content-accessing,super objects,location replication and geometrical distance,and dimension priority algorithm in the spatial grids,and service encapsulation algorithm.

Routing Void Problem of Greedy Forwarding Strategy in Wireless Sensor Networks;

However,the problem that most of the geographic routing algorithms which adopt greedy algorithm as their basic routing strategies have to face is the routing void phenomena .

To handle routing void of greedy geographical routing in wireless sensor networks,an efficiency adaptive void-handle algorithm is proposed,which is based on route signs that are distributed extracted and eliminated iteratively.