Presented by:

C.SUCHITHRA

Department of Computer Science

Dr. Pauls Engineering College

AN INNOVATIVE APPROACH FOR SECURE MULTI-OWNER DATA SHARING FOR DYNAMIC GROUPS IN THE CLOUD

Guided by:Mr. G. APPASAMI M.Tech., (Ph.D.,)Assistant Professor (CSE),Dr. Pauls Engineering College

ABSTRACTINTRODUCTIONEXISTING SYSTEMPROPOSED SYSTEMSYSTEM MODELDESIGN GOALSSIMULATION RESULTSCONCLUSION

AGENDA

Due to the frequent change of the membership, sharing data in a multi-owner manner is a major problem in cloud computing.

Identity privacy and Privacy preserving from an untrusted cloud is still a challenging issue.

By Leveraging Group Signature and Dynamic Broadcast encryption techniques, any cloud user can anonymously share data with others.

ABSTRACT

The main aim is to secure data sharing in dynamic groups, there is no fixed attributes whereas multi-owner attributes is possible.

Meanwhile, the storage overhead and encryption computation cost of the scheme are independent with the number of revoked users.

It also analyze the security of scheme with rigorous proof and demonstrate the efficiency in experiment.

Contd…

Cloud computing

It consists of H/w & S/w resources made available on the internet as managed third-party services.

These service typically provide access to advanced s/w application & high-end network of server computers.

An Internet connection An account - Created with a user name and a password Agree to Terms

The Cloud Requires

Can be less expensive compared to buying software and hardware.

Can be used from any computer or device with an Internet connection.

The device does not need as large of an internal storage system.

Advantages

Anywhereat any time

Sharing

Work wherever

you are

Collaboration

The most fundamental services offered by cloud providers is data storage.

With cloud computing and storage, users are able to access and to share resources o ered by cloud service providers at a fflower marginal cost.

Cloud-based service providers are globally connected to each other and offer a seamless service to their customers.

INTRODUCTION

In the existing system data owners store the encrypted data files in untrusted storage and distribute the corresponding decryption keys only to authorized users.

The complexities of user participation and revocation in these schemes are linearly increasing with the number of data owners and the number of revoked users.

The changes of membership make secure data sharing extremely difficult and the issue of user revocation is not addressed.

EXISTING SYSTEM

Identity privacy is one of the most significant obstacles for the wide deployment of cloud computing.

Without the guarantee of identity privacy, users may be unwilling to join in cloud computing systems.

Because their real identities could be easily disclosed to cloud providers and attackers.

On the other hand, unconditional identity privacy may incur the abuse of privacy.

DISADVANTAGES OF EXISTING SYSTEM

Attribute based encryption technique new granted users can directly decrypt data files and uploaded before their participation without contacting with data owners.

User revocation can be easily achieved through a novel revocation list without updating the secret keys of the remaining users.

The size and computation overhead of encryption are constant and independent with the number of revoked users.

Its provide secure and privacy-preserving access control to users.

PROPOSED SYSTEM

Moreover, the real identities of data owners can be revealed by the group manager when disputes occur.

Compared with the Single-owner, Multiple-owner is more flexible in practical applications.

Each user in the group is able to not only read data , but also modify his/her part of data in the entire data file shared by the company.

Contd…

Any user in the group can store and share data files with others by the cloud.

The encryption complexity and size of cipher texts are independent with the number of revoked users in the system.

User revocation can be achieved without updating the private keys of the remaining users.

ADVANTAGES OF PROPOSED SYSTEM

GROUP SIGNATURE

Allows any member of the group to sign messages while keeping the identity secret from verifiers.

Besides, the designated group manager can reveal the identity of the signature’s originator when a dispute occurs.

Used to achieve anonymous access control.

DYNAMIC BROADCAST ENCRYPTION

To transmit encrypted data to a set of users so that only a privileged subset of users can decrypt the data.

It also allows the group manager to dynamically include new members while preserving previously computed information.

SYSTEM MODEL

The system model consists of five different entities

• The cloud Server,

• Group Manager (i.e., the company manager)

• Group Members (i.e., the staffs)

• Key distribution

• Revocation

Access control Data confidentiality Anonymity and Traceability Efficiency

DESIGN GOALS

SIMULATION RESULTS

Comparison on computation cost for file generation between Innovative and ODBE

Comparison on computation cost for file access between Innovative and ODBE.

SCREEN SHOTS

SCREEN SHOTS

SCREEN SHOTS

SCREEN SHOTS

This work designs a secure data sharing scheme, for dynamic clusters in an untrusted cloud.

A user is able to share data with others in the group without revealing identity privacy to the cloud.

Additionally, it supports efficient user revocation and new user joining.

Moreover, the storage overhead and the encryption computation cost are constant.

Extensive analyses show that this proposed scheme satisfies the desired security requirements and guarantees efficiency as well

CONCLUSION

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QUERIES ???