Improved Data Client Security of DAS Model Using CDAMA in Wireless Sensor Network

Wireless sensor networks is different from that in commonsense mobile ad-hoc networks.CDA provides end-to-end security.ie. even though the sensed data are encrypted on the sensor nodes and not decrypted before the sink node In this paper, all the homomorphism encryption techniques and various attacks is categorized, but CDA schemes are not satisfy multi-application environments and not provide secure counting; so they may suffer unauthorized aggregation attacks Therefore, a new concealed data aggregation scheme based on homomorphism public encryption system. CDAMA is designed by using multiple points, each of which has different order. DAS model are the bandwidth overhead between the server and client The security of CDAMA are based on the hardness assumption of subgroup decision problem. To maintain data privacy , clients need to outsource their data to servers in encrypted form. So that time, clients must still be able to execute queries over encrypted data.