Hybrid Provable Data Possession at Untrusted Stores In Cloud Computing. Narn – Yih Lee. Southern Taiwan University. Information Management Department. The model described for the use of Provable data Possession which allow the client to access the the server has to store a large amount of data, but it is. 29 Jun We introduce a model for provable data possession (PDP) that allows a client that has stored data at an untrusted server to verify that the server.

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There are two classes of basic scheme. The goal of POR is to accomplish these checks without users having to download the files themselves. It rely on erasure correcting code in the file distribution preparation to untrustes redundancy parity vectors and guarantee the data dependability.

User can remotelystored their data on the cloud. Homomorphic authenticator and possessioj masking technique are used to guarantee that TPA would learn any knowledge about the data content stored on the cloud server during the efficient auditing process.

Survey on Auditing Mechanism for Preserving Privacy in Cloud Computing | Open Access Journals

With cloud nutrustedcloud service providers offers users to access and to share resources cost. PDP schemes have drawback is that it works only for static databases[17]. But there is a privacy issue introduced in shared data with using existing mechanisms is the leakage of identity privacy to public verifiers.

It exploits symmetric keys to verify the integrity of data ,it is not public verifiable. It has shortest response of any proof of retrievability scheme with private verifiability. In oruta ring signature is used to construct homomorphic authenticators because of that public verifier is able to verify the integrity of shared data without retrieving the entire data during the identity of the signer on each block in shared data is kept private from the public verifier.

Existing public auditing mechanisms is used to podsession shared data integrity. Provable storage system enables efficient proofs of a whole file system, enabling verification at different users and same time not having to download the whole data[6].


Security and Privacy in Comm. But the user do not fell protected because data is stored at cloud required security and integrity. It alleviates new attacks that stem from the underlying principle of network coding. The use of encryption renders the sentinels indistinguishable from other file blocks.

Use of batch auditing ,computation cost is reduced. It has the profable query and response of any proof of retrievability with public verifiability. And also support for dynamic operations on data blocks i. It supports efficient authenticated operations on files at block level such as authenticated insert and delete. Blockless verification allows a verifier to check the correctness of data stored in the cloud server.

Non-malleability is that an attacker cannot generate valid signatures on invalid blocks by linearly combining existing signatures. It perform multiple auditing tasks simultaneously and improve the efficiency of verification for multiple auditing tasks. Boyang Wang, Baochun Li and Hui Li introduces Knox is a privacy preserving mechanism for data stored in the cloud and shared among a large number of users in a group. It support update and delete operations on data but insert operations are not available in it.

Homomorphic linear authenticator and random masking guarantees that TPA does not learn any knowledge about data content stored on cloud sever during auditing process. The server does not learn anything about client access patterns while client do not learn anything more than their delegated rights permit[14].

Data owners can delegate rights to external new clients enabling them to privately access portions of the outsourced data served by a curious server.

It guarantees the simultaneous identification of the misbehaving servers[9].

Security and Communication Networks

POR protocol encrypts F and randomly embeds a set of randomly valued check blocks called sentinels. Aggregate signature provides verifiably encrypted signatures that signature enable the verifier to test that a given ciphertext C I the encryption of a signature on a given message Verifiably encrypted signatures are used in contract signing protocols.

Shacham introduces An aggregate signatures are useful for reducing the size of certificate chains by aggregating all signatures in the chain. Samarati exploited For data outsourcing, it presented an indexing technique that proves to be efficient while ensuring content access and pattern confidentiality.


The data integrity verification is done by Third party auditor TPA ,who check the integrity of data periodically on behalf of the client. The main reason is the size of cloud data which is large. Shulman-Peleg identify attacks that exploit client side deduplication,allowing an attacker to gain access to arbitrary size files of other users based on a very small hash signatures of files. Sionintroduces,Consider multiple clients want to share data on a server, while hiding all access patterns.

When data have been corrupted in the cloud to verify data integrity, downloading the entire cloud data that cost or even waste users amounts of computation and communication resources. It having drawback ,it provides a user with a limited number of verification requests[4]. Xu introduces Proof of storage with deduplication or POSD, to fulfil data integrity and duplication simultaneously.

Consider TPA may concurrently handle multiple audit sessions from different users for their outsourced data file,it can extends privacy preserving public auditing protocol into multiuser setting ,where TPA can perform the multiple auditing tasks in a batch manner i.

Many mechanism allow data owner as well as public verifier to perform integrity checking without retrieving entire data from cloud, which is called as public auditing. For similar level of security the signature length is half the size of a Possesxion signature. Consider a file F consisting of n blocks, it define an update as inserting a new block or modifying an existing block or deleting any block. POR provides quality of service guarantees means a file is retievable within a certain srores bound.

Knox exploits homomorphic MACs to reduce the space used to store verification information[16]. ORAM allows for delegated read or write access while ensuring strong guarantees for the privacy of outsourced data. The client have a constant amount of metadata to verify the proof.

Cloud computing is an arising technology which provide various services through internet. Second scheme ,which builds on pseudorandom functions PRFs and is secure in the standard model.