Identity authentication technology is of great importance in daily life. In every platform, we need to log in to the user account to verify the status and transactions of the account. Of course, identity authentication is also an essential and important part of platform businesses. More and more data from applications is transferred to the cloud for operation and storage, while the cloud information security mechanism is also continuously implemented. On the other hand, this paper uses blockchain technology for secure identity authentication. In the context of the secure voice authentication system, the existing security status of Windows systems adds a secure multi-factor authentication mechanism. In the context of the cloud operation mechanism, continuous coordination is used to ensure the security of the system. This paper introduces in detail the identity authentication system composition, design, implementation process and practical experimental results related to information security. In the field of identity authentication information, cloud information systems can continuously improve the security performance of identities.