Abstract: For the security authentication between the user in question of cloud platform,based on the openstack cloud platform architecture,security authentication keystone components,the identity authentication of the main security issues in cloud computing and the current cloud environments mainstream identity authentication technology,aiming at the mechanism for unified authentication and unified identity authentication technology platform under the cloud of vulnerability,this article analyzed the work principle of OpenID authentication, presented currently existing OpenID security problems,and obtained some improvements.Finally on the basis of the OpenID improvement techniques,the identity authentication technology was realized on the openstack platform.

Key words: Openstack,Identity authentication,OpenID