Title

An efficient dynamic authenticated key exchange protocol with selectable identities

RIS ID

44821

Publication Details

Guo, H., Li, Z., Mu, Y., Zhang, F., Wu, C. & Teng, J. (2011). An efficient dynamic authenticated key exchange protocol with selectable identities. Computers and Mathematics with Applications, 61 (9), 2518-2527.

Abstract

In the traditional identity-based cryptography, when a user holds multiple identities as its public keys, it has to manage an equal number of private keys. The recent advances of identity-based cryptography allow a single private key to map multiple public keys (identities) that are selectable by the user. This approach simplifies the private key management. Unfortunately, the existing schemes have a heavy computation overhead, since the private key generator has to authenticate all identities in order to generate a resultant private key. In particular, it has been considered as a drawback that the data size for a user is proportional to the number of associated identities. Moreover, these schemes do not allow dynamic changes of user identities. When a user upgrades its identities, the private key generator (PKG) has to authenticate the identities and generate a new private key. To overcome these problems, in this paper we present an efficient dynamic identity-based key exchange protocol with selectable identities, and prove its security under the bilinear Diffie–Hellman assumption in the random oracle model.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.camwa.2011.02.041