CRUPA: collusion resistant user revocable public auditing of shared data in cloud

Abstract

Cloud repository is one of the most important services afforded by Cloud Computing where information is preserved, maintained, archived in distant servers and made available to the users over the Internet. Provided with the cloud repository facilities, customers can organize themselves as a cluster and distribute information with one another. In order to allow public integrity auditing on the information stored in semi-trusted cloud server, customers compute the signatures for every chunk of the shared information. When a malicious client is repudiated from the group, the chunks that were outsourced to the cloud server by this renounced customer need to be verified and resigned by the customer present in the cluster (i.e., the straightforward approach) which results in huge transmission and reckoning cost for the customer. In order to minimize the burden of customers present in the cluster, in the existing scheme Panda, the semi-trusted Cloud Service Provider (CSP) is allowed to compute the Re − sign key. Further, the CSP audits and resigns the revoked customer chunks by utilizing the Re − sign key. So, it is easy for the CSP by colluding with the revoked customer to find the secret keys of the existing customer. We introduce a novel Collusion Resistant User Revocable Public Auditing of Shared Data in Cloud (CRUPA) by making use of the concept of regression technique. In order to secure the secret keys of the existing customers from the CSP, we have allowed the information proprietor to compute the Re − sign key using the regression technique. Whenever the information proprietor revokes the customer from the cluster, the information proprietor computes the Re − sign key using the regression technique and sends to the CSP. Further, the CSP audits and resigns the revoked customer chunks using the Re − sign key. The Re − sign key computed by the information proprietor using regression method is highly secure and the malicious CSP cannot find the private information of the customers in the cluster. Besides, our mechanism achieves significant improvement in the computation cost of the Re − sign key by information proprietor. Further, the proposed scheme is collusion resistant, supports effective and secure customer repudiation, multi-information proprietor batch auditing and is scalable.

The Rise of Cloud Computing: Data Protection, Privacy, and Open Research Challenges—A Systematic Literature Review (SLR)

“…However, the author of the paper [ 39 ] proved that the scheme proposed in [ 38 ] is vulnerable to malicious counterfeiting by the CSP. A collision-resistant user revocable public auditing (CRUPA) system [ 40 ] is introduced for managing the data that is shared in groups. Another scheme [ 41 ] is introduced as a way to ensure the integrity of mobile data terminals in cloud computing.…”

Protecting Information Stored Inside the Cloud with A New CCA-EBO Protocol Designed on Hive Technology

“…Using the idea of regressive, the researchers of [11] create CRUPA, which stands for "Collusion Resistant User Revocable Public Auditing". The DO is responsible for recalculating the "Re-sign key" through regressive and transmitting that to CS in particular to protect the cryptographic keys of an active CU.…”

Towards Lightweight Provable Data Possession for Cloud Storage Using Indistinguishability Obfuscation

“…In this scenario, CS may collude with revoked user and get the secret key of the existing user. To address such collusion attack, Mara et al [76] introduce CRUPA: Collusion Resistant User Revocable Public Auditing by the concept of regression. To secure the secret key of an existing user from CS, information proprietor is used to re-compute the Re-sign key using regression and send it to CS.…”