The form of electronic signature can be handwritten signature or seal, and it has legal effect as long as it is confirmed by myself. Electronic signature refers to the information contained in electronic form, which is used to identify the identity of the signer and show the signer's approval of the content. The legality of electronic signature is guaranteed by the third-party authorized agency CA. The form of electronic signature can also be graphics and images, that is, graphics or seal images composed of handwritten signature words with individual characteristics.