The digital signature algorithm should meet at least three conditions:

The receiver can verify the sender’s signature on the message;?

The sender cannot deny the signature afterwards. The signature of its message;?

The receiver cannot forge a signature on the message. ?

Digital signature algorithm is a subset of the digital signature standard, which represents a specific public key algorithm used only for digital signatures. The key is run on the message hash generated by SHA-1: to verify a signature, the hash of the message is recalculated, the signature is decrypted using the public key and the results are compared. The abbreviation is DSA.

Digital signature is a special form of electronic signature. So far, at least more than 20 countries have passed laws recognizing electronic signatures, including the European Union and the United States. my country's electronic signature law was adopted at the 11th meeting of the Standing Committee of the 10th National People's Congress on August 28, 2004. . A digital signature is defined in the ISO 7498-2 standard as: “Some data appended to a data unit, or a cryptographic transformation made to the data unit, which allows the recipient of the data unit to confirm the source and origin of the data unit. The integrity of the data unit and protects the data from forgery by someone (e.g. the recipient).” The digital signature mechanism provides an identification method to solve problems such as forgery, denial, impersonation and tampering. It uses data encryption technology and data transformation technology to enable both parties to send and receive data to meet two conditions: the receiver can identify what the sender claims. Identity; the sender cannot later deny that it sent the data.

Digital signature is an important branch of cryptography theory. It is proposed to sign electronic documents to replace handwritten signatures on traditional paper documents, so it must have 5 characteristics.

(1) The signature is credible.

(2) The signature cannot be forged.

(3) Signatures are not reusable.

(4) Signed files are immutable.

(5) The signature is non-repudiation.

Reference link: Digital signature algorithm_Baidu Encyclopedia

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