A Dynamic and Cross-Domain Authentication Asymmetric Group Key Agreement in Telemedicine Application

Telemedicine offers medical services remotely via telecommunications systems and physiological monitoring devices. Group-oriented communication is an important application for telemedicine. However, transmission of information over an insecure channel such as Internet or private data storing generates a security problem. Therefore, authentication, confidentiality, and privacy are important challenges in telemedicine. Therefore, developing suitable encryption communication protocol for group communication is quite important for modern medicine. Group key agreement is one way to ensure the security of group-oriented communication for telemedicine. In this paper, we propose a dynamic and cross-domain authenticated asymmetric group key agreement. The protocol adopts cross-domain authentication mechanism to avoid the security risks of key escrow and the complexity of certificate management. It supports the dynamic group key update of nodes for forward secrecy and backward security of group key, and also achieving the key self-certified, the member participated group key agreement can self-certify whether the calculated group keys are correct. The protocol is proven secure under the inverse computational Diffie-Hellman problem assumption, and the performance analysis shows that the proposed scheme is highly efficient. The proposed scheme is more suitable for security group communication in telemedicine.