117340627 ensuring-distributed-accountability-for-data-sharing-in-the-cloud

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117340627 ensuring-distributed-accountability-for-data-sharing-in-the-cloud

  1. 1. Ensuring Distributed Accountability for Data Sharing in the CloudAbstract—Cloud computing enables highly scalable services to be easily consumed over theInternet on an as-needed basis. A major feature of the cloud services is that users’data are usually processed remotely in unknown machines that users do not own oroperate. While enjoying the convenience brought by this new emergingtechnology, users’ fears of losing control of their own data (particularly, financialand health data) can become a significant barrier to the wide adoption of cloudservices. To address this problem, in this paper, we propose a novel highlydecentralized information accountability framework to keep track of the actualusage of the users’ data in the cloud. In particular, we propose an object-centeredapproach that enables enclosing our logging mechanism together with users’ dataand policies. We leverage the JAR programmable capabilities to both create adynamic and traveling object, and to ensure that any access to users’ data willtrigger authentication and automated logging local to the JARs. To strengthenuser’s control, we also provide distributed auditing mechanisms. We provideextensive experimental studies that demonstrate the efficiency and effectiveness ofthe proposed approaches.Existing system & Demerits:Conventional access control approaches developed for closed domains such asdatabases and operating systems, or approaches using a centralized server indistributed environments, are not suitable, due to the following features
  2. 2. characterizing cloud environments. First, data handling can be outsourced by thedirect Cloud Service Provider (CSP) to other entities in the cloud and thesesentities can also delegate the tasks to others, and so on. Second, entities areallowed to join and leave the cloud in a flexible manner.Proposed system:To overcome the above problems, we propose a novel approach, namely CloudInformation Accountability (CIA) framework, based on the notion of informationaccountability. Unlike privacy protection technologies which are built on the hide-it-or-lose-it perspective, information accountability focuses on keeping the datausage transparent and trackable. Our proposed CIA framework provides end-to endaccountability in a highly distributed fashion. One of the main innovative featuresof the CIA framework lies in its ability of maintaining lightweight and powerfulaccountability that combines aspects of access control, usage control andauthentication. By means of the CIA, data owners can track not only whether ornot the service-level agreements are being honored, but also enforce access andusage control rules as needed. Associated with the accountability feature, we alsodevelop two distinct modes for auditing: push mode and pull mode. The pushmode refers to logs being periodically sent to the data owner or stakeholder whilethe pull mode refers to an alternative approach whereby the user (or anotherauthorized party) can retrieve the logs as needed.Explanation:Alice, a professional photographer, plans to sell her photographs by using the Sky-high Cloud Services. For her business in the cloud, she has the followingrequirements:. Her photographs are downloaded only by users who have paid for her services.
  3. 3. . Potential buyers are allowed to view her pictures first before they make thepayment to obtain the download right.. Due to the nature of some of her works, only users from certain countries canview or download some sets of photographs.. For some of her works, users are allowed to only view them for a limited time, sothat the users cannot reproduce her work easily.. In case any dispute arises with a client, she wants to have all the accessinformation of that client. . She wants to ensure that the cloud service providers ofSky-high do not share her data with other service providers, so that theaccountability provided for individual users can also be expected from the cloudservice providers.

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