PROVIDING SECURITY BY AES AMONG MULTI-USERS IN CLOUD Presentation By : Mohammed Abdul Sarfaraz Registration No.: 12311D2518. Specialization : Software

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PROVIDING SECURITY BY AES AMONG MULTI-USERS IN CLOUD

Presentation By : Mohammed Abdul Sarfaraz

Registration No.: 12311D2518.

Specialization : Software Engineering.

Internal Guide : Mr. K Damodhar RaoAssociate Professor, Department of CSE,SNIST, Hyderabad.

External Guide : Ms. B KusumaSoftware Engineer,CE3IT Solutions.

Providing Security By AES Among Multi-Users In Cloud

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CO

NT

EN

TS

Abstract

Introduction

Existing System

Proposed System

Architecture

DFD

Modules

UML Diagrams

Screenshots

Conclusion and Future ScopeProviding Security By AES Among Multi-Users In Cloud

3 ABSTRACT

Cloud computing provides an economical and efficient solution for sharing group resource

among cloud users with low maintenance. Unfortunately, sharing data in a multi-owner manner

while preserving data and identity privacy from an untrusted cloud is still a challenging issue,

due to the frequent change of the membership.

So, we propose a secure multi owner data sharing scheme, for dynamic groups in the cloud.

By leveraging group signature and dynamic broadcast encryption techniques, any cloud user

can anonymously share data with others.

Meanwhile, the storage overhead and encryption computation cost of our scheme are

independent with the number of revoked users. In addition, we analyze the security of our

scheme with rigorous proofs, and demonstrate the efficiency of our scheme in experiments.


4 INTRODUCTION

•Cloud Computing- Is an alternative for traditional information technology.

•Data Sharing- Is a fundamental service offered by cloud providers.

•Privacy Preserving- Is provided by encrypting the data files.

•Access Control- Who can access the data stored in the cloud.

•Dynamic Groups- Groups are normally dynamic in practice, e.g., new staff participation and

current employee revocation in a company.


5

EXISTING SYSTEM

•Not possible to trace the identity of the misbehaving users.

•Difficult to maintain dynamic groups.

•Data owners store the encrypted data files in untrusted storage and distribute the corresponding

decryption keys only to authorized users.

•A secure provenance scheme based on the cipher text-policy attribute-based encryption

technique, which allows any member in a group to share data with others. Providing Security By AES Among Multi-Users In Cloud

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DISADVANTAGES IN EXISTING SYSTEM

•It is not possible to trace which user converts as a false file.

•Users are also modifying the data, that kind of possibility is available here.

•Without permission everyone easily sharing the file to all members.

•Group Manager doesn’t communicate with group members.

•All group members also possible to revocation. Providing Security By AES Among Multi-Users In Cloud

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PROPOSED SYSTEM

•We propose a secure multi-owner data sharing scheme.

•Our proposed scheme is able to support dynamic groups efficiently.

•We provide secure and privacy-preserving access control to users.

•Each group members having different public key.

•Owner of the application only possible to revocation.

•Without giving permission data sharing not possible.


8

ADVANTAGES OF PROPOSED SYSTEM

•High Security services.

•Minimize the complexity of secrete key management environment here.

•Maintain the data as a sensitive data without giving access to any unauthorized users.


9 ARCHITECTURE

Cloud Server Data Read/Write

Group Members

Revocation

Key Distribution Registration

Group Manager

Fig 1 : System Architecture


10 DATA FLOW DIAGRAMS


Admin

Group Manager

Group Members

Cloud

Fig 2 : DFD Level 0

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Admin

Group Manager

Registration

Group Member

s

Cloud

Data Read/Write

Fig 3 : DFD Level 1

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Registration

Group Manager

Group Members

Key Distribution

Using Key

Data Read/Write

Admin

Cloud

Fig 4 : DFD Level 2

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Modules

1. User Registration

2. User Revocation

3. File Generation and deletion

4. File Access and Traceability

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1. User Registration

•The group manager registers the users and allocates each user with a private key that will be

used for group signature and encryption purpose

2. User Revocation

•User revocation is performed by the group manager via a public available revocation list.

•Group manger update the revocation list each day.

Group Manager Group Members

Group Manager Cloud

Registration

Key Distribution

Fig 5 : User Registration

Fig 6 : User Revocation

Revocation

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3. File Generation and Deletion•To store and share a data file in the cloud, a group member gets the revocation list from the

cloud.

•In this step, the member sends the group ID as a request to the cloud.

•Verifying the validity of the received revocation list, file stored in the cloud can be deleted by

either the group manager or the data owner.

4. File Access and Traceability

•To access the cloud, a user needs to compute a group signature for his/her authentication.

•When a data dispute occurs, the tracing operation is performed by the group manager to

identify the real identity of the data owner.


16 UML DIAGRAMS


Cloud Analyst

User Authentication

Security

Cloud Provider

Group Manager

Provide Key

File Generator

User Log Client

Fig 7 : Use Case diagram

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User Registration

cloudprovidercloudlogin

username()cloudproviderlogin()

Security provider

Encryptionkeylogfiles

Secure()

Manipulation

downloadupdatedelete

Give_Permission()

Database

updateselectdelete

Manipulation()update_file()select_file()delete_file()Fig 8 : Class diagram

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User Application Cloud Provider Group Members

Login cloud

Cloud access

RequestData

ResponseData

KeyRequest

GenerateKey

RevocationKey

File select, update, delete

Storeddata

Recoverdata

EncryptionKeyFig 9 : Sequence diagram


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Providing Security By AES Among Multi-Users In CloudFig 11 : Collaboration diagram

Group Manager Cloud

Group member

1. CloudLogin()

2. Cloudaccess()

3. R

egist

ratio

n()

4. GeneratesKey()

5. GrantK

eys()

6. UpdateRevocationList()

10. enterRevocationKey()

7. CreatesFile()

8. updat

eInto

Cloud()

9. re

triev

efile

()

11. R

evoc

atio

nKey

()

12. verfiesKey()

13. sendFile()

14. recoversFile()

20 User

Proxy

Application

UserRequest

Cloudmembers

Group provider

Key access

Fig 10 : Activity diagram


21 SCREENSHOTS


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23


24


25


26


27


28


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30 CONCLUSION AND FUTURE SCOPE

Conclusion

Future Scope

In this scheme, a user is able to share data without revealing identity privacy to the cloud. It

supports efficient user revocation and new user joining . The storage overhead and the encryption

computation cost are constant. It satisfies the desired security requirements and guarantees

efficiency as well.

As cloud computing is an emerging technology, this project will be very useful for

implementing in the real time clouds because of the several advantages it provides.


31 REFERENCES[1] M. Armbrust, A. Fox, R. Griffith, A.D. Joseph, R.H. Katz, A.Konwinski, G. Lee, D.A. Patterson, A. Rabkin, I. Stoica, and M. Zaharia, “A View of Cloud Computing,” Comm. ACM, vol. 53,no. 4, pp. 50-58, Apr. 2010.

[2] S. Kamara and K. Lauter, “Cryptographic Cloud Storage,” Proc.Int’l Conf. Financial Cryptography and Data Security (FC), pp. 136-149, Jan. 2010.

[3] S. Yu, C. Wang, K. Ren, and W. Lou, “Achieving Secure, Scalable, and Fine-Grained Data Access Control in Cloud Computing,” Proc. IEEE INFOCOM, pp. 534-542, 2010.

[4] M. Kallahalla, E. Riedel, R. Swaminathan, Q. Wang, and K. Fu, “Plutus: Scalable Secure File Sharing on Untrusted Storage,” Proc.USENIX Conf. File and Storage Technologies, pp. 29-42, 2003.

[5] E. Goh, H. Shacham, N. Modadugu, and D. Boneh, “Sirius: Securing Remote Untrusted Storage,” Proc. Network and Distributed Systems Security Symp. (NDSS), pp. 131-145, 2003.

[6] G. Ateniese, K. Fu, M. Green, and S. Hohenberger, “Improved Proxy Re-Encryption Schemes with Applications to Secure Distributed Storage,” Proc. Network and Distributed Systems Security Symp. (NDSS), pp. 29-43, 2005.

[7] R. Lu, X. Lin, X. Liang, and X. Shen, “Secure Provenance: The Essential of Bread and Butter of Data Forensics in Cloud Computing,” Proc. ACM Symp Information, Computer and Comm. Security, pp. 282-292, 2010.

[8] B. Waters, “Ciphertext-Policy Attribute-Based Encryption: An Expressive, Efficient, and Provably Secure Realization,” Proc. Int’lConf. Practice and Theory in Public Key Cryptography Conf. Public Key Cryptography, http://eprint.iacr.org/2008/290.pdf, 2008.

[9] V. Goyal, O. Pandey, A. Sahai, and B. Waters, “Attribute-Based Encryption for Fine-Grained Access Control of Encrypted Data,” Proc. ACM Conf. Computer and Comm. Security (CCS), pp. 89-98, 2006.

[10] D. Naor, M. Naor, and J.B. Lotspiech, “Revocation and Tracing Schemes for Stateless Receivers,” Proc. Ann. Int’l Cryptology Conf. Advances in Cryptology (CRYPTO), pp. 41-62, 2001. Providing Security By AES Among Multi-Users In Cloud

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PROVIDING SECURITY BY AES AMONG MULTI-USERS IN CLOUD Presentation By : Mohammed Abdul Sarfaraz Registration No.: 12311D2518. Specialization : Software