Paper 2010/209

Identity-Based Authenticated Asymmetric Group Key Agreement Protocol

Lei Zhang, Qianhong Wu, Bo Qin, and Josep Domingo-Ferrer


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.

Available format(s)
Public-key cryptography
Publication info
Published elsewhere. The 16th Annual International Computing and Combinatorics Conference (COCOON 2010)
Identity-Based Public-Key CryptographyGroup Key AgreementAsymmetric Group Key AgreementBilinear Map.
Contact author(s)
lei zhang @ urv cat
2010-04-19: received
Short URL
Creative Commons Attribution


      author = {Lei Zhang and Qianhong Wu and Bo Qin and Josep Domingo-Ferrer},
      title = {Identity-Based Authenticated Asymmetric Group Key Agreement Protocol},
      howpublished = {Cryptology ePrint Archive, Paper 2010/209},
      year = {2010},
      note = {\url{}},
      url = {}
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