Digital Signatures: Verifying the Authenticity and Integrity of Digital Information
Digital signatures combine hash functions and public-key cryptography to determine whether digital information has been altered and to verify the source of a signature. They are widely used in network communications, finance, law, healthcare, and cryptocurrency transactions, but their security depends on reliable algorithms, proper implementation, and private-key protection.
What Is a Digital Signature?
A digital signature is a cryptographic tool used to verify the authenticity and integrity of digital data. It is not simply an electronic version of a handwritten signature; instead, it uses cryptographic mechanisms to associate the signer with a specific message. The recipient can use it to check the message source and determine whether the content was tampered with during transmission.
The Signing and Verification Process
The sender first uses a hashing algorithm to convert the message into a fixed-length message digest, then signs the digest using their private key. The recipient subsequently uses the sender’s public key to verify the signature. If the message content, signature, or corresponding key relationship does not match, verification fails, helping to detect anomalies.
Functions, Applications, and Risks
Digital signatures primarily provide data integrity, authentication, and non-repudiation. They can be used for internet communications, audits and loan agreements, legal documents, medical records, and cryptocurrency transaction authorization. However, they are not absolutely secure: algorithmic flaws, implementation errors, or private-key exposure can undermine these protections, so private keys must be stored securely.
Original Tutorial
https://www.binance.com/zh-CN/academy/glossary/digital-signature
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