Abstract. In a computing environment, Authentication is one of the most important techniques. ID/Password scheme which is currently the most widely used authentication methods is easy to implement and the scheme have the advantage of low cost, etc., but there are many issues from a safety. OTP(One Time Password) is characterized in that a disadvantage in usability, on the other hand, with a number of advantages for security. Among these recent years, Biometric authentication is attracting attention as the spread of smart device equipped with a biometric smart sensor. In this article, we will analyze the limit of knowledge-based authentication and possession-based authentication and the prospect of a biometric authentication technology. And we will analyze the FIDO protocol that provides a user authentication function using a biometric technique that is used by the smart devices in the online environment.