Research On Key Management Scheme Of Delay Tolerant Network In Agriculture And Pastoral Areas Content Delivery System

Delay Tolerant Network(DTN)has been extensively studied in recent years.There is no end-to-end connection in DTN.The nodes in DTN usually use "storagecarry-forward" way to transfer data.With the popularity of mobile devices such as smart phones and tablet PCs in remote areas,it is possible to distribute content in remote areas by the hybrid network that combine satellite networks with DTN.In the agricultural and pastoral areas content delivery system,the security problem cannot be ignored.The identity authentication and the access control are indispensable,and the key management problem is the prerequisite for realizing DTN security.The analysis of the key management schemes in the existing DTN shows that no scheme is applicable to the special DTN environment in the agricultural and pastoral areas content delivery system.Therefore,this thesis proposes a new DTN key management scheme for this system.The plan contains three phases,the first phase is the network initialization phase.After the mobile communication node requests the digital ID card from the satellite network receiving server,it generates its own public and private key pair and the blind digital ID card.The second stage is the node communication stage.The node verifies the verification data sent by source node.The node verifies the integrity of the data,then the node verifies the identity of the source node and its public key.Then the node uses the public key of source node to encrypt the data.The third stage is the key update phase.The node can select a new secret parameters and then generates a new public-private key pair and the blind digital ID card.We have proved the correctness of the scheme and analyzed the security of it.The analysis shows that the scheme can resist multiple attacks such as passive attack and public key replacement attack.Finally,we compare this scheme with other DTN key management schemes,and the comparative analysis shows that the scheme has moderate calculation and can well meet the security requirements of the special DTN environment in the agricultural and pastoral areas content delivery system.