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A LIGHTWEIGHT SECURE DATA SHARING SCHEME FOR MOBILE CLOUD COMPUTING

A LIGHTWEIGHT SECURE DATA
SHARING SCHEME FOR MOBILE CLOUD COMPUTING

ABSTRACT

                With the popularity of cloud computing, mobile devices can store/retrieve personal data from anywhere at any time. Consequently, the data security problem in mobile cloud becomes more and more severe and prevents further development of mobile cloud. There are substantial studies that have been conducted to improve the cloud security. However, most of them are not applicable for mobile cloud since mobile devices only have limited computing resources and power.  Solutions with low computational overhead are in great need for mobile cloud applications. In this paper, we propose a lightweight data sharing scheme (LDSS) for mobile cloud computing.  It adopts CP-ABE, an access control technology used in normal cloud environment, but changes the structure of access control tree to make it suitable for mobile cloud environments. LDSS moves a large portion of the computational intensive access control tree transformation in CP-ABE from mobile devices to external proxy servers. Further more, to reduce the user revocation cost, it introduces
attribute description fields to implement lazy-revocation, which is a thorny issue in program based CP-ABE systems. The experimental results show that LDSS can effectively reduce the overhead on the mobile device side when users are sharing data in mobile cloud environments.


EXISTING SYSTEM

                  when people upload their data files onto the cloud, they are leaving the data in a place where is out of their control, and the CSP may spy on user data for its commercial interests and/or other reasons. Second, people have to send password to each data user if they only want to share the encrypted data with certain users, which is very cumbersome. However, this approach requires fine-grained access control. In both cases, password management is a big issue.

DISADVANTAGE

 Password management is a big issue.
 Requires fine-grained access control
 Not sufficient or not very convenient

PROPOSED SYSTEM

 we propose a Lightweight Data Sharing Scheme (LDSS) for mobile cloud computing environment.
 The main contributions of LDSS are as follows:
 We design an algorithm called LDSS-CP-ABE based on Attribute-Based Encryption (ABE) method to offer efficient access control over cipher text.



ADVANTAGE

 To assist users to encrypt and decrypt data so that user-side overhead can be minimized
 Trusted authority
 Confidentiality of access control

HARDWARE REQUIREMENTS

 System : Pentium IV 2.4 GHz.
 Hard Disk : 40 GB.
 Floppy Drive : 1.44 Mb.
 Monitor : 14’ Colour Monitor.
 Mouse : Optical Mouse.
 Ram : 512 Mb.

SOFTWARE REQUIREMENTS

 Operating system : Windows 7 Ultimate.
 Coding Language : ASP.Net with C#/java
 Front-End : Visual Studio 2010 Professional.
 Data Base : SQL Server 2008.







CONCLUSION


                      In recent years, many studies on access control in cloud are based on attribute-based encryption algorithm (ABE). However, traditional ABE is not suitable for mobile cloud because it is computationally intensive and mobile devices only have limited resources. In this paper, we propose LDSS to address this issue. It introduces a novel LDSS-CP-ABE algorithm to migrate major computation overhead from mobile devices onto proxy servers, thus it can solve the secure data sharing problem in mobile cloud.

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