International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: Identity-Based Authenticated Asymmetric Group Key Agreement Protocol

Lei Zhang
Qianhong Wu
Bo Qin
Josep Domingo-Ferrer
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Abstract: In identity-based public-key cryptography, an entity's public key can be easily derived from its identity. The direct derivation of public keys in identity-based public-key cryptography eliminates the need for certificates and solves certain public key management problems in traditional public-key cryptosystems. Recently, the notion of asymmetric group key agreement was introduced, in which the group members merely negotiate a common encryption key which is accessible to any entity, but they hold respective secret decryption keys. In this paper, we first propose a security model for identity-based authenticated asymmetric group key agreement (IB-AAGKA) protocols. We then propose an IB-AAGKA protocol which is proven secure under the Bilinear Di±e-Hellman Exponent assumption. Our protocol is also efficient, and readily adaptable to provide broadcast encryption.
  title={Identity-Based Authenticated Asymmetric Group Key Agreement Protocol},
  booktitle={IACR Eprint archive},
  keywords={public-key cryptography / Identity-Based Public-Key Cryptography, Group Key Agreement,  Asymmetric Group Key Agreement, Bilinear Map.},
  note={The 16th Annual International Computing and Combinatorics Conference (COCOON 2010) 14713 received 14 Apr 2010},
  author={Lei Zhang and Qianhong Wu and Bo Qin and Josep Domingo-Ferrer},