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Decentralized Access Control with Anony

Authentication of Data Stored in Clouds - PDistributed Systems

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Abstract

We propose a new decentralized access control scheme f

storage in clouds that supports anonymous authentication. Ischeme, the cloud verifies the authenticity of the series w

the user's identity before storing data. Our scheme also

feature of access control in which only valid users are able

stored information. The scheme prevents replay attacks

creation, modification, and reading data stored in the c

address user revocation. Moreover, our authentication and

scheme is decentralized and robust, unlike other access cdesigned for clouds which are centralized. The c

computation, and storage overheads are comparable

approaches.

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Introduction

The user should authenticate itself before initiating any transaction,

hand, it must be ensured that the cloud does not tamper with

outsourced. User privacy is also required so that the cloud or other u

the identity of the user. The cloud can hold the user accountabl

outsources, and likewise, the cloud is itself accountable for the se

The validity of the user who stores the data is also verified. Apart f

solutions to ensure security and privacy, there is also a need for law e

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EXISTING SYSTEM

On access control in cloud are centralized in nature. Exceschemes use attribute based encryption. The scheme in u

key approach and does not support authentication. The s

support authentication as well. Earlier work by Zhao. How e

take a centralized approach where a single key dist

distributes secret keys and attributes to all users. Unfortu

KDC is not only a single point of failure but difficult to main

large number of users that are supported in cloud en

emphasize that clouds should take a decentralized

distributing secret keys and attributes to users.

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Disadvantages

Did not provide user authentication.

User can create and store a file and other users can only

Write access was not permitted to users other than the c

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PROPOSEDSYSTEM

The protocol that we propose here computes a parameterized

functions, which we call threshold functions, in which the two extre

correspond to the problems of computing the union and intersection

subsets.

Those are in fact general-purpose protocols that can be used in othe

as well. Another problem of secure multiparty computation that we s

as part of our discussion is the set inclusion problem; namely, the

where Alice holds a private subset of some round set, and Bob

element in the ground set, and they wish to determine whether Bob

is within Alicessubset, without revealing to either of them informa

the other partysinput beyond the above described inclusion.

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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 users credentials

Key distribution is done in a decentralized way. One

limitation is that the cloud knows the access policy for eacrecord stored in the cloud

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Reference

S. Ruj, M. Stojmenovic and A. Nayak, Privacy Preserving

Access Control with Authentication for Securing Data inClouds, IEEE/ACM International Symposium on Cluster, Cloud

and Grid Computing, pp. 556563, 2012.

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Hardware Specification

Processor : Any Processor above 500 M

Ram : 128Mb.

Hard Disk : 10 Gb.

Compact Disk : 650 Mb.

Input device : Standard Keyboard and M

Output device : VGA and High Resolution

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Software Specification

Operating System : Windows Family.

Programming Language : ASP.NET, C#.Net.

Database : SQL Server 2005

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Decentralized Access Control with Anony

Authentication of Data Stored in Clouds -

Distributed Systems