Digital signature, also known as public key digital signature and electronic signature, is an ordinary physical signature similar to that written on paper, but it is realized by using the technology in the field of public key encryption to identify digital information. A digital signature is just some data attached to a data unit, or a password change made to a data unit.

The so-called digital signature is to generate a series of symbols and codes through some cryptographic operation, and form an electronic password to sign, instead of writing a signature or seal. This kind of electronic signature can also be technically verified, and its verification accuracy is incomparable to that of ordinary manual signature and stamp verification.

Digital signature is not scanning your signature into a digital image, or obtaining your signature with a touch screen, let alone your signature. 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.

Digital certificate adopts public key system (asymmetric key), that is, a pair of matching keys are used for encryption and decryption.

Digital signature refers to the data obtained by encrypting the hash abstract of the original data with the user's own private key.

RSA Algorithm Description RSA algorithm is a relatively perfect public key cryptosystem proposed by Rivest, Shamir and Adleman in 1977. RSA algorithm is a public key algorithm, which can be used for encryption and digital signature.