Abstract
Asymmetric group key agreement allows a group of users to negotiate a common public encryption key, and each user only holds his own secret encryption key. Authenticated asymmetric group key agreement (AAGKA) protocol is a kind of AGKA protocols which can be secure against active attacks. Dynamic asymmetric group key agreement allows any member to join and leave at any point. This paper studies dynamic AAGKA in certificateless cryptography. We first pointed that Wei et al.’s dynamic certificateless AAGKA protocol suffers from a key compromise impersonation attack, and cannot provide secrecy or forward secrecy. We then proposed an improved dynamic certificateless AAGKA protocol. Security proofs show that our protocol can provide security attributes including secrecy, known-key security, key compromise impersonation resistance, forward security, non-repudiation, and privacy. Furthermore, the proposed protocol is still efficient.
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Funding
This work is supported by National Natural Science Foundation of China (No. 61502436, 61672471), Science and Technology Program of Henan Province (No. 172102210060), Plan for Scientific Innovation Talent of Henan Province (No. 184200510010), Program for Innovative Research Team in Science and Technology in University of Henan Province (No. 18IRTSTHN012) and Doctor Fund Project of Zhengzhou University of Light Industry (No. 2014BSJJ081).
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Sun, H., Li, L., Zhang, J., Huang, W. (2020). An Improved Dynamic Certificateless Authenticated Asymmetric Group Key Agreement Protocol with Trusted KGC. In: Tian, Y., Ma, T., Khan, M. (eds) Big Data and Security. ICBDS 2019. Communications in Computer and Information Science, vol 1210. Springer, Singapore. https://doi.org/10.1007/978-981-15-7530-3_16
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DOI: https://doi.org/10.1007/978-981-15-7530-3_16
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