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

Authors: Hua Guo , Chang Xu a , Zhoujun Li a , Yanqing Yao a , Yi Mu

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. Man- aging 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 simpli- fied. 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 associ- ated 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.

Publish Year: 2013

Published in: Information Sciences - Science Direct

موضوع: رمزنگاری

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