1, the characteristics of digital signature
Security: Digital signature can protect the security and integrity of information during transmission and prevent information from being tampered with or forged.
Non-repudiation: Digital signature can prove the identity of the sender of information, so that the sender cannot deny the information he sent.
Unforgettable: A digital signature needs to be signed with a private key. Only the person with the corresponding private key can generate a valid signature, and others cannot forge the signature.
Non-replicability: the digital signature is closely related to the original data, so the original data cannot be extracted from the signature, so the signature cannot be copied.
2. Application scenarios of digital signature
Electronic document signature: The government, enterprises or individuals can use digital signatures to sign electronic documents to ensure the authenticity and integrity of the documents.
Network security: Digital signature can be used in the field of network security, such as authentication and data integrity verification in VPN, SSH and other protocols.
E-mail: Digital signature can be used in e-mail communication to verify the identity of the sender and prevent the mail from being tampered with.
E-commerce: In e-commerce, merchants can use digital signatures to prove the authenticity and integrity of the order information they send, thus protecting the rights and interests of consumers.
Realization principle of digital signature
1, hash function
Digital signature uses hash function to process the original data and generate a fixed-length hash value.
2. Public key and private key
Digital signature needs to use a pair of public key and private key, the public key is used to encrypt data and verify the signature, and the private key is used to generate the signature.
3. Coding algorithm
Digital signature uses encryption algorithm to combine hash value and private key to generate digital signature. High security, non-repudiation, unforgeability, non-duplication, and protection of information integrity and sender identity. It needs cryptographic algorithm and key management technology, which is complex and costly to implement.