![REFERENCES
• [1] Cong Wang,Qian Wang,Kui Ren,Wenjing Lou(2010) ”Privacy
Preserving Public Auditing for Data Storage Security in Cloud
Computing”.
• [2] Patrick Honer. ”Cloud Computing security requirements and
• solutions: A systematic literature review”
• [3] Jachak K.B, Korde S.K, Ghorpade P.P and Gagare G.J. ”Homomorphic
authentication with random masking technique ensuring privacy and security in
cloud computing.”
• [4] Sunil Sanka1, Chittaranjan Hota1, Muttukrishnan Rajarajan2 ”Secure Data
Access in Cloud Computing”](https://image.slidesharecdn.com/privacypreservingpublicauditing-151116063846-lva1-app6892/85/Privacy-preserving-public-auditing-33-320.jpg)
Privacy preserving public auditing
- 1. Public Auditing of Data Stored in Cloud by preserving privacy Presented by, Shima V M Roll.No:15 Guided By Mrs. Lekshmy D Kumar Assistant Professor
- 2. INTRODUCTION • Cloud computing is an Internet based computing which enables sharing of services. • Cloud computing makes computing and storage resources available to users on demand • Security in cloud is achieved by signing the data block before sending to the cloud. • Users should be able to just use the cloud storage as if it is local, without worrying about the need to verify its integrity.
- 3. INTRODUCTION(contd..) • Public Auditing mechanism for secure cloud storage. • Users can resort to a Third Party Auditor (TPA) to check the integrity of outsourced data.
- 4. Architecture of Cloud Data Storage
- 5. OBJECTIVE • To set up cloud environment using any available open source cloud. • To implement Public auditability on cloud data server. – verify the integrity of the data cloud on demand without having to retrieve a copy of all information
- 6. Literature Survey • MAC based Solution – Data owner maintains MACs for the data file to be outsourced – Integrity is checked by recalculating the MAC and compare it with precomputed value – For very large files MAC cannot be employed • Proof of Retrievability scheme – A keyed hash function is used in POR scheme
- 7. Literature Survey(contd..) – Verifier pre-computes the cryptographic hash of file and stores the hash as well as a secret key – The verifier releases the secret key K to the cloud archive – Asks cloud archive to compute and return the hash value of file • Cloud Security using TPA – Uses RSA algorithm, for client data/file encryption and decryptions
- 8. Literature Survey(contd..) – Also uses SHA-512 which makes message digest and check the data integrity – Solves the problem of integrity, unauthorized access, privacy and consistency
- 9. techniques and details • The technique of providing more security by using the Third Party Auditor (TPA) . • Only the user knows the information about the data stored in the cloud. • When anyone tries to modify or steal the data TPA informs the user by verifying the data. • The TPA doesn’t even allows the CSP to read the data of the user.
- 10. techniques and details Modules – KeyGen :- key generation algorithm that is run by the user to setup the scheme. – SigGen :- SigGen is used by the user to generate verification metadata – GenProof :- GenProof is run by the cloud server to generate a proof of data storage correctness – VerifyProof :- Run by the TPA to audit the proof.
- 11. techniques and details • Two phases to construct public Auditing • SetUp phase – Achieve public and secret key parameters – Verification metadata is sent to TPA • Audit phase – TPA sends audit message or challenge to the cloud – Cloud executes GenProof on stored data file as response – TPA retrieves the file tag for each user
- 13. Key Generation Process • KeyGen Algorithm – Client generates a random signing key pair(spk,ssk) – Choose random ‘x’ which is an positive integer and ‘u’ є G1 – Compute v=(gx) – Secret parametre sk=(x,ssk) – Public parametre pk=(spk,v,g,u)
- 14. SigGen Process
- 15. SigGen Process • sigGen Process – Data file F=(m1,m2….mn) – Compute authenticator Ϭi=H(Wi).umi)x, Wi=name||i – For each block there is an authenticator form the set of authenticators denoted as Φ – Compute the file tag t=Encrypt(hash(name)) using secret key ssk – User sends Φ,t to server as well as to the TPA
- 16. GenProof Process
- 17. GenProof Process
- 19. VerifyProof Process • TPA runs VerifyProof to validate it by computing the aggregate authenticator • Verifies µ and R values send by the server • If the values matches the file in the server is not corrupted
- 20. Auditing using Multicast Batch RSA • Sender chooses two large prime numbers P and Q • Calculate N=P*Q • Calculate two exponents e,d such that e*d=1modΦ(N) where Φ(N)=(P-1)(Q-1) • Calculate authenticator for each block and aggregate authenticator is denoted as σ • Verification is done using
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- 30. Summary • In this system a way for providing security to cloud storage by maintaining data integrity and privacy preserving. • Homomorphic linear authenticator with random masking to provide the guarantee data privacy. • The users data leakage is prevented. • A mobile message alert has been implemented to enhance security.
- 31. Summary • In this system a way for providing security to cloud storage by maintaining data integrity and privacy preserving. • Homomorphic linear authenticator with random masking to provide the guarantee data privacy. • The users data leakage is prevented. • Auditing is further enhanced by using Multicast RSA batch authentication scheme
- 32. List of publications • Shima V M and Lekshmy D Kumar “Public Auditing of Data stored in Cloud by Preserving Privacy” International Journal of Engineering and Advanced Technology (IJEAT), Vol. 4, August 2015. • Shima V M and Lekshmy D Kumar A Survey on “Privacy Preserving Public Auditing for Security of Data” International Journal of Computer and Advanced Engineering Research (IJCAER), Vol. 2, April 2015. • Shima V M and Jayasudha J S “A survey on Deduplication File System for Virtual Machine Images” International Journal of Technology Enhancement and Emerging (IJTEEE), Vol. 3, July 2015.
- 33. REFERENCES • [1] Cong Wang,Qian Wang,Kui Ren,Wenjing Lou(2010) ”Privacy Preserving Public Auditing for Data Storage Security in Cloud Computing”. • [2] Patrick Honer. ”Cloud Computing security requirements and • solutions: A systematic literature review” • [3] Jachak K.B, Korde S.K, Ghorpade P.P and Gagare G.J. ”Homomorphic authentication with random masking technique ensuring privacy and security in cloud computing.” • [4] Sunil Sanka1, Chittaranjan Hota1, Muttukrishnan Rajarajan2 ”Secure Data Access in Cloud Computing”
- 34. Thank You