Efficient and dynamic key management for multiple identities in identity-based systems

Authors:
Hua Guo;Chang Xu;Zhoujun Li;Yanqing Yao;Yi Mu
Affiliations:
State Key Laboratory of Software Development Environment, Beihang University, Beijing, China;State Key Laboratory of Software Development Environment, Beihang University, Beijing, China;State Key Laboratory of Software Development Environment, Beihang University, Beijing, China and Beijing Key Laboratory of Network Technology, Beihang University, Beijing, China;State Key Laboratory of Software Development Environment, Beihang University, Beijing, China;College of Mathematics and Computer Science, Fujian Normal University, Fuzhou, China and Centre for Computer and Information Security Research, School of Computer Science Software Engineering, Uni ...
Venue:
Information Sciences: an International Journal
Year:
2013

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Abstract

The traditional identity-based cryptography requires a user, who holds multiple identities, to hold multiple private keys, where each private key is associated with an identity. Managing multiple private/public keys is a heavy burden to a user due to key management and storage. The recent advancement of identity-based cryptography allow a single private key to map multiple public keys (identities); therefore the private key management is simplified. Unfortunately, the existing schemes capturing this feature do not allow dynamic changes of identities and have a large data size proportional to the number of the associated identities. To overcome these problems, in this paper, we present an efficient and dynamic identity-based key exchange protocol and prove its security under the Bilinear Diffie-Hellman assumption in the random oracle model. Our protocol requires a relatively small bandwidth for a key agreement communication, in comparison with other existing schemes.