Decentralized access control with anonymous authentication of data stored in clouds parallel distributed systems
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This document discusses a proposed decentralized access control system for securely storing data in clouds that supports anonymous authentication. The system allows clouds to verify the authenticity of users without knowing their identities, and only allows valid users to decrypt stored data. It prevents replay attacks and supports data creation, modification, and reading while addressing user revocation. The proposed approach is decentralized and robust unlike prior centralized access control systems for clouds.
Decentralized access control with anonymous authentication of data stored in clouds parallel distributed systems
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- 6. Decentralized Access Control with Anonymous Authentication of Data Stored in Clouds - Parallel Distributed Systems @LeMeniz Infotech
- 7. Abstract We propose a new decentralized access control scheme for secure data storage in clouds that supports anonymous authentication. In the proposed scheme, the cloud verifies the authenticity of the series without knowing the user's identity before storing data. Our scheme also has the added feature of access control in which only valid users are able to decrypt the stored information. The scheme prevents replay attacks and supports creation, modification, and reading data stored in the cloud. We also address user revocation. Moreover, our authentication and access control scheme is decentralized and robust, unlike other access control schemes designed for clouds which are centralized. The communication, computation, and storage overheads are comparable to centralized approaches.
- 8. Introduction The user should authenticate itself before initiating any transaction, and on the other hand, it must be ensured that the cloud does not tamper with the data that is outsourced. User privacy is also required so that the cloud or other users do not know the identity of the user. The cloud can hold the user accountable for the data it outsources, and likewise, the cloud is itself accountable for the services it provides. The validity of the user who stores the data is also verified. Apart from the technical solutions to ensure security and privacy, there is also a need for law enforcement.
- 9. EXISTING SYSTEM On access control in cloud are centralized in nature. Except and all other schemes use attribute based encryption. The scheme in uses a symmetric key approach and does not support authentication. The schemes do not support authentication as well. Earlier work by Zhao. How ever, the authors take a centralized approach where a single key distribution center distributes secret keys and attributes to all users. Unfortunately, a single KDC is not only a single point of failure but difficult to maintain because of large number of users that are supported in cloud environment. We emphasize that clouds should take a decentralized approach while distributing secret keys and attributes to users.
- 10. Disadvantages • Did not provide user authentication. • User can create and store a file and other users can only read the file. Write access was not permitted to users other than the creator.
- 11. PROPOSED SYSTEM The protocol that we propose here computes a parameterized family of functions, which we call threshold functions, in which the two extreme cases correspond to the problems of computing the union and intersection of private subsets. Those are in fact general-purpose protocols that can be used in other contexts as well. Another problem of secure multiparty computation that we solve here as part of our discussion is the set inclusion problem; namely, the problem where Alice holds a private subset of some round set, and Bob holds an element in the ground set, and they wish to determine whether Bob’s element is within Alice’s subset, without revealing to either of them information about the other party’s input beyond the above described inclusion.
- 12. Advantages • Decentralized access control technique with anonymous. • authentication which provides user revocation and prevents replay attack. • The cloud does not know the identity of the user who stores information, but only verifies the user’s credentials. Key distribution is done in a decentralized way. One limitation is that the cloud knows the access policy for each record stored in the cloud
- 13. Reference S. Ruj, M. Stojmenovic and A. Nayak, “Privacy Preserving Access Control with Authentication for Securing Data in Clouds”, IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing, pp. 556–563, 2012.
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- 15. Software Specification Operating System : Windows Family. Programming Language : ASP.NET, C#.Net. Database : SQL Server 2005
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