Need. Digital signature does not necessarily need third-party authentication, but it can be authenticated by an enterprise legal person with the approval of the competent department of information industry. Digital signature is the application of asymmetric key encryption technology and digital digest technology.

Second, analysis

Digital signature is a digital string that only the sender of information can produce, and others can't forge it. This number string is also an effective proof of the authenticity of the information sent by the information sender. It is a method to authenticate digital information, which is similar to the ordinary physical signature written on paper, but it is realized by using the technology in the field of public key encryption.

3. What are the main functions of digital signature?

1, anti-impersonation, the private key is only known by the signer, and it is impossible for others to construct it correctly;

2. identifiable. In the network environment, the receiver must be able to identify the identity claimed by the sender;

3, tamper-proof, digital signature, signature and the original file form a mixed whole data, which cannot be tampered with, thus ensuring the integrity of the data;

4. Anti-replay. In digital signature, if technologies such as serial number and timestamp are added to the signed message, replay attacks can be prevented.