Leakage-Resilient Outsourced Revocable Certificateless Signature with a Cloud Revocation Server


  • Yuh–Min Tseng Department of Mathematics, National Changhua University of Education, Jin–De Campus, Chang–Hua City 500, Taiwan
  • Jui-Di Wu
  • Sen-Shan Huang
  • Tung-Tso Tsai




Certificateless public-key system (CL-PKS) is a significant public-key cryptography and it solves both the key escrow and certificate management problems. Outsourced revocable certificateless public-key system (ORCL-PKS) with a cloud revocation server (CRS) not only provides a revocation mechanism, but also further outsources the revocation functionality to the CRS to reduce the computational burden of the key generation center (KGC). Recently, side-channel attacks have threatened some existing conventional cryptography (including CL-PKS). Indeed, adversaries can apply side-channel attacks to derive fractional constituents of private (or secret) keys to damage the security of these cryptographic protocols (or schemes). To withstand such attacks, leakage-resilient cryptography is an attractive approach. However, little research concerns with leakage-resilient certificateless cryptography. In this paper, the first leakage-resilient outsourced revocable certificateless signature (LR-ORCLS) scheme is presented. The proposed scheme allows adversaries to continually derive fractional constituents of private (or secret) keys and possesses overall unbounded leakage property. In the generic bilinear group (GBG) model, our scheme is shown to be existential unforgeable against adversaries. Finally, the comparisons between the proposed scheme and the previous revocable certificateless signature schemes are provided to demonstrate the merits of the proposed scheme.

Author Biography

Yuh–Min Tseng, Department of Mathematics, National Changhua University of Education, Jin–De Campus, Chang–Hua City 500, Taiwan

Yuh-Min Tseng received the B.S. degree in Computer Science and Engineering from National Chiao Tung University, Taiwan, Republic of China, in 1988; and the M.S. degree in Computer and Information Engineering from National Taiwan University in 1990 and the Ph.D. degree in Applied Mathematics from National Chung-Hsing University in 1999. He is currently a Professor in the Department of Mathematics, National Changhua University of Education, Taiwan, R.O.C.. He is a member of IEEE Communications Society and the Chinese Cryptology and Information Security Association (CCISA). In 2006, his paper obtained the Wilkes Award from The British Computer Society. He serves as the editor of several international Journals: Computer Standards & Interfaces, International Journal of Security and Its Applications, ISRN Communications and Networking , International Journal of Intelligent Information Processing , International Journal of Advancements in Computing Technology, Journal of Current Engineering Research, Wireless Engineering and Technology, Journal of Engineering, International Journal of Computer Mathematics, and International Journal of Information and Network Security. His research interests include cryptography, information security, network security, computer network and mobile communications.