No, nobody can sign the same signature twice. How does the machine distinguish whether the difference in handwriting is a normal writing habit or a forgery? Therefore, handwriting identification can only be based on appraisers and assisted by machines.

Handwritten signature is easy to explain, that is, writing your own name. It is customary to use handwritten signature documents without the prior consent of the parties. Handwritten signatures make signatures written on various paper documents have obvious personality characteristics. The appearance of handwritten signature is a handwritten character with personal characteristics. In handwritten signature, handwriting is a comprehensive reflection of the writer's own physiological characteristics and acquired practice, which is called "words are like people". Based on the inherent characteristics of handwriting, handwritten signature has become one of the common means for people to identify themselves. The legal effect of handwritten signature documents is stipulated by relevant laws.