Aimed at the security problems of the cross-cloud, cross-level and cross-domain in multi-level

An enhanced security certificateless key agreement scheme is designed in this paper. System building and the generation of user key and key distribution are described in detail. The analysis result of security and performance indicate that this protocol is highly secure and the performance is better than other similar protocols.

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Abstract. Cyberspace has become an important domain the same as the land, sea, air and space. Many cyberspace models were proposed to explain such a high coupled complex domain, but lack of practical method of construction these models make them hard to function. This paper proposes an event based method of construction of cyberspace models. We formalize a cyber event as an attribute group by abstracting key elements of the event. Through entity-mapping and relation-mapping, we construct cyberspace models base on graph theory by representing cyber entities as vertexes and relations between entities as edges.