Digital signature is the data that the information to be signed is only processed by irreversible algorithm.

These data can be used as an electronic certificate to ensure the integrity of electronic documents and the non-repudiation of signers.

Irreversible encryption algorithm will be used in the process of digital signature. After the relevant information is processed by these algorithms, it will not be restored and will become difficult to understand. The algorithm itself ensures that it is almost impossible to encrypt two different messages into the same signature. This makes it difficult for third parties to decipher, tamper with or forge signatures.

At present, there are many digital signature algorithms such as MD5 and SHA.