Legal analysis: (1) When electronic signature production data is used for electronic signature, it belongs exclusively to the electronic signer; (2) When signing, the electronic signature production data is only controlled by the electronic signer; (3) Any changes to the electronic signature after signature can be found; (4) Any changes to the content and form of the data message after signature can be found.

Legal basis: Article 13 of the Electronic Signature Law of People's Republic of China (PRC) stipulates that an electronic signature shall be regarded as reliable if it meets the following conditions:

(1) When the electronic signature production data is used for electronic signature, it belongs to the exclusive rights of the electronic signer;

(2) When signing, the electronic signature production data is only controlled by the electronic signer;

(3) Any changes to the electronic signature after signature can be found;

(4) Any changes to the content and form of the data message after signature can be found.