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Decentralized Access Control with Anony
Authentication of Data Stored in Clouds - PDistributed Systems
@LeMen
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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 -
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