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What are the characteristics of digital 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. A set of digital signatures usually defines two complementary operations, one for signing and the other for verification.

A digital signature is a digital string, which can only be generated by the sender of the 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.

Digital signature is the application of asymmetric key encryption technology and digital digest technology.

"When sending a message, the sender uses a hash function to generate a message digest from the message text, and then encrypts the digest with its own private key. The encrypted digest will be sent to the receiver with the message. The receiver first uses the same hash function as the sender to calculate the message digest from the received original message, and then decrypts the digital signature attached to the message with the sender's public key. If the two digests are the same, the receiver can confirm that the digital signature belongs to the sender.

Digital signature has two functions: first, it can be sure that the message is indeed signed by the sender, because others can't forge the sender's signature. Secondly, the digital signature can determine the integrity of the message. Because the characteristic of digital signature is that it represents the characteristics of the file, if the file changes, the value of the digital abstract will also change. Different files will get different digital summaries. Digital signature involves hash function, sender's public key and sender's private key. "

Digital signature:

The sender encrypts message X with its own key, generates unreadable ciphertext Dsk, and then sends Dsk to the receiver. To verify the signature, the receiver decrypts the message using the sender's public key.

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