Digital signature is a method using public key encryption technology to verify digital information. Simply put, a digital signature is some data attached to a data unit, or an encrypted conversion of the data unit. This data or transformation allows the receiver of the data unit to confirm the source and integrity of the data unit and protect the data from being forged by others. This is a method of signing an electronic message, and the signed message can be transmitted in a communication network.

Digital signature mainly goes through the following processes:

1. The information sender uses a one-way HASH function (hash function) to generate an information digest of the information;

2. The message sender signs the message digest with his own private key;

3. The message sender sends the message itself and the signed message digest together;

4. The information receiver generates a new message digest by using the same one-way HASH function as the information sender, and then verifies the message digest by using the public key of the information sender to confirm the identity of the information sender and whether the information has been modified.

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