Int. J. of Grid and Utility Computing   »   2013 Vol.4, No.1

 

 

Title: Efficient online/offline signcryption without key exposure

 

Authors: Fei Yan; Xiaofeng Chen; Yinghui Zhang

 

Addresses:
State Key Laboratory of Integrated Service Networks (ISN), Xidian University, Xi'an 710071, China
State Key Laboratory of Integrated Service Networks (ISN), Xidian University, Xi'an 710071, China
State Key Laboratory of Integrated Service Networks (ISN), Xidian University, Xi'an 710071, China

 

Abstract: An online/offline signcryption scheme provides confidentiality and authentication simultaneously, and it is particularly suitable for the application of resource-constrained systems. In this paper, we present a key-exposure free online/offline signcryption scheme. In contrast, it seems that all the existing online/offline signcryption schemes based on Shamir-Tauman's paradigm suffer from the key exposure problem. In the random oracle model, the proposed scheme is proved to be indistinguishable against adaptive chosen-ciphertext attacks (IND-CCA2) and existentially unforgeable against chosen-message attacks (EUF-CMA). Besides, an improved scheme is proposed, which requires none of the recipient's public information in the offline phase and hence makes practical sense.

 

Keywords: online signcryption; offline signcryption; key exposure; chameleon hash function; confidentiality; authentication; security; random oracle model; chosen-ciphertext attacks; chosen-message attacks; encryption; cryptography.

 

DOI: 10.1504/IJGUC.2013.054492

 

Int. J. of Grid and Utility Computing, 2013 Vol.4, No.1, pp.85 - 93

 

Submission date: 29 Jun 2012
Date of acceptance: 06 Jul 2012
Available online: 16 Jun 2013

 

 

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