Digital signature, using the private key of digital certificate to encrypt data, ensures the integrity, authenticity and non-repudiation of data.

Digital signature (also known as public key digital signature and electronic signature) is an ordinary physical signature, similar to the signature written on paper, but it is realized by using the technology in the field of public key encryption, which is used to identify digital information. A set of digital signatures usually defines two complementary operations, one for signing and the other for verification.

Identity authentication technology is a solution in the process of confirming the identity of the operator in the computer network. How to ensure that the operator who operates in a digital identity is the legal owner of this digital identity, that is to say, to ensure that the physical identity of the operator corresponds to the digital identity, identity authentication technology is to solve this problem. As the first gateway to protect network assets, identity authentication plays an important role.

Nowadays, digital signature technology has been widely used in online banking. When transferring money, the U shield is used as the signature, and the background bank verifies the signature to ensure that the transaction has not been tampered with.

There are many ways to realize identity authentication technology: static password, smart card (ic card), short message password, dynamic password card, dynamic token, mobile phone dynamic password, USBKEY (that is, bank U shield, K treasure, online silver shield) and biometric technology (fingerprint, iris, etc.). ) and so on.