SeShare: Secure cloud data sharing based on blockchain and public auditing

Abstract

SummaryIn a data sharing group, each user can upload, modify, and access group files and a user is required to generate a new signature for the modified file after modification. There is a situation that two or more users modify the same file at almost the same time, which should be avoided as it gives rise to a signature conflict. However, the existing schemes do not take it into consideration. In this paper, we proposed a new mechanism SeShare for data storing based on blockchain to realize signature uniqueness, which solves the problem of generating signatures for the same file meanwhile by different group users. Specifically, we record every signature of a file in a blockchain in chronological order, and only one user is allowed to add new signature at the end of the blockchain when modification conflicts occur. On the other hand, to provide a secure data sharing service, SeShare introduces an efficient public auditing scheme for file integrity verification when a group user leaves the group. We also prove the security of the proposed scheme and evaluate the performance at the end of this paper. Our experimental results demonstrate the efficiency of public auditing for user leaving.

IPAPA: Incentive Public Auditing Scheme against Procrastinating Auditor

“…However, their scheme needs the data user to generate a challenge. Huang et al [27] utilized three different transactions to record data dynamics in blockchain. Some schemes utilized smart contracts to realize fair judgement recently.…”

Certificateless Public Verification for Data Storage and Sharing in the Cloud

“…We assume that |Z q | = 160 bits, |G 1 | = 160 bits, the number of blocks in shared data is n = 1, 000, 000 and |n| = 20 bits. According to the previous work in SeShare [24] , to keep the detection probability greater than 99%, we set the number of challenged blocks in each auditing task as c = 460. Fig.2 and Fig.3 show the comparison of experimental results between our scheme and schemes CPV [3] and CPDP [15] .…”

Zero‐knowledge‐based distributed auditing protocol

“…In this type of protocol, TPAs assist the CA in data integrity checking. Generally, these protocols are designed based on pre‐defined TPAs, 6,7 public/random TPAs, 8,9 and SC 10,11 . However, the mentioned categories have advantages and disadvantages as below.…”