The signature authentication on smartphones has been studied as a method to protect personal information. Its authentication accuracy is a challenge due to restrictions such as size of the terminal. In this paper, a signature authentication method that incorporates the calligraphy concept called Eight Principles of Yong is proposed for users of Chinese characters. The Eight Principles of Yong means that the character Yong has the eight techniques needed to describe any Chinese character. In the method, the certifier makes clusters from Yong in advance. Strokes of the template are allocated in clusters. At the time of authentication, strokes of the character are allocated in these clusters. If the cluster is the same as the stroke, the distance between the data decreases.