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Security and Communication Networks
Volume 2017, Article ID 6758618, 14 pages
Research Article

Certificateless Public Auditing Protocol with Constant Verification Time

Center for Information Security Technologies (CIST), Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea

Correspondence should be addressed to Ik Rae Jeong;

Received 18 August 2016; Accepted 7 November 2016; Published 30 January 2017

Academic Editor: Muhammad Khurram Khan

Copyright © 2017 Dongmin Kim and Ik Rae Jeong. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


To provide the integrity of outsourced data in the cloud storage services, many public auditing schemes which allow a user to check the integrity of the outsourced data have been proposed. Since most of the schemes are constructed on Public Key Infrastructure (PKI), they suffer from several concerns like management of certificates. To resolve the problems, certificateless public auditing schemes also have been studied in recent years. In this paper, we propose a certificateless public auditing scheme which has the constant-time verification algorithm. Therefore, our scheme is more efficient than previous certificateless public auditing schemes. To prove the security of our certificateless public auditing scheme, we first define three formal security models and prove the security of our scheme under the three security models.