1. When electronic signature production data is used for electronic signature, it belongs 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 signing can be found.

Any changes in the content and form of the data message after signing can be found.

Second, the principle of electronic signature:

Simply put, electronic signature is the technology of directly signing and stamping electronic documents by using hash algorithm and encryption algorithm. In order to ensure the legal effect of the signed electronic document, the electronic document signed by electronic signature also needs to have the characteristics of recognizable signature identity and tamper-proof signature content.

Three. Note: requirements for preservation:

1, which can effectively express the content and can be retrieved at any time.

2. The format of the data message is the same as that when it was generated, sent or received, or it is different, but it can accurately represent the content originally generated, sent or received.

3. Be able to identify the sender and receiver of the data message and the time of sending and receiving.