International Association of Computer Science and Information Technology(IACSIT)
Cloud Computing paradigm provides resources of computing infrastructure as services over the Internet. Along with the several benefits it offers it suffers from various security risks. Data outsourced onto the honest-but-curious public cloud servers should be protected from unauthorized access including the cloud service providers. Data should be encrypted to maintain confidentiality. There is need for access control mechanism to provide data access selectively to the authorized users. The authors propose a dynamic access control scheme using multi-line map that requires users to store only a single key irrespective of the number of data items to which user has authorized access.