First, the nature is different.

1, authentication

Identity authentication generally refers to authentication, also known as "verification" and "authentication", which means confirming the identity of users through certain means.

2. Digital signature

Digital signature (also known as public key digital signature) is a digital string that can only be generated by the sender of information, and others cannot forge it. This number string is also an effective proof of the authenticity of the information sent by the information sender.

Second, the purpose is different.

1, authentication

The purpose of authentication is to confirm that the user who claims to be a certain identity is indeed the claimed user.

2. Digital signature

Digital signature is the application of asymmetric key encryption technology and digital digest technology, which is used to identify digital information.

Third, the methods are different.

1, authentication

There are many authentication methods, which can be basically divided into: authentication based on * * * shared key, authentication based on biometrics and authentication based on public key encryption algorithm. Different authentication methods have different security levels.

2. Digital signature

Digital signature algorithm is realized by public key encryption technology. In public key encryption technology, each user has a pair of keys: a public key and a private key. The public key can be released freely, but the private key is confidential. Another requirement is that the private key cannot be calculated from the public key. ?

Common digital signature algorithms include three algorithms:?

(1), password generation algorithm.

② marking algorithm.

③ Verification algorithm.

Baidu encyclopedia-identity authentication

Baidu Encyclopedia-Digital Signature