The Cross-Domain Identity Authentication Scheme Has no Trusted Authentication Center in the Cloud Environment

This paper analyzes the existing problems of cross-domain authentication models and proposes a new cross-domain authentication model because there is no trusted authentication center in the cloud environment. The model is based on the certificateless public-key cryptosystem. It takes advantage of the transformability of heavy signature; A resigned proxy is introduced between two different domains for identity transformation. The authentication work is mainly concentrated in the key generation center KA and Proxy in different domains to reduce information interaction and computation between users and cloud service providers. At the same time, this message’s identity information is added to each request message of the user, and check the identification information in the received reply message to confirm whether it is a reply to the application message. This method can prevent malicious attacks and improve security. The results show that the scheme satisfies key security, message unforgeability, and communication information confidentiality.