An enhanced approach on distributed accountability for shared data in cloud

摘要

Cloud computing contribute huge business opportunities. Cloud data has always hacked by the cyber attackers. The cloud user's major concerns in cloud are lack of clarity and loss of control over their data. Data accountability is the way to ensure the trust on cloud service provider which allows to monitor the cloud user data usage. These computation and storage are distributed in nature. To address this issue we are utilizing a framework called Cloud Information Accountability. To provide security to the log recording encryption is performed that leads to lack of time and space. Further the untrusted cloud service provider cause key abuse attacks. To overcome the above limitation a novel information accountability system is proposed to ensure the tracking of user data usage in cloud. The Homomorphic encryption is utilized on user data which is uploaded on the cloud. This feature is called "strong binding" which means both data and policies travel with the data thus providing distributed accountability which is very essential because of distributed nature of the cloud. Hence this framework provides end to end accountability for user's data at both Cloud Service Providers (CSP) and Cloud users by providing the log records for their data. Furthermore a protocol is designed based on objects for data access that prevents the key abuse attack. The method improves the security performance up to 95%.