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The editor will share with you what the digital signature certificate is. I hope you will gain a lot after reading this article. Let's discuss the methods together.

Digital signature certificate is a kind of digital certificate specially used for digital signature. So what is a digital signature and what is the function of a digital signature? The following editor will introduce them one by one.

To understand digital signatures, we must first understand asymmetric encryption algorithms, because digital signatures are based on asymmetric algorithms. Asymmetric encryption is to create a pair of keys, which become public keys and private keys respectively, which are paired. When using public key encryption, you must use private key to decrypt. After using private key encryption, you can only use public key to decrypt.

Digital signature is the asymmetric encryption of the hash value of the data, that is, the private key is used to encrypt the hash value of the data.

Because public and private keys are used in pairs, using private encryption requires the use of a public key to decrypt. On the other hand, as long as the public key can be used for decryption, it must be encrypted with the private key paired with the public key. In fact, this is to determine the identity of the signer.

The digital certificate is issued by the CA institution. When issuing the digital certificate, the applicant will generate a pair of public key and private key, and then send the public key to CA,CA. After verifying the identity of the user, combined with the public key to make a digital signature certificate and publish it on the Internet.

The function of digital signature certificate

I. data integrity

The hash value of the data is asymmetrically encrypted during the digital signature. if the data is tampered with, then the hash value will change, which will eventually lead to the failure of digital signature verification, so that it is easy to find out whether the original data has been changed.

2. Non-repudiation

Because the digital certificate can only be issued after the applicant information has been reviewed by the authoritative CA organization, there is the non-repudiation of the signer. Because each public key and private key are paired and can be decrypted using the public key, then the corresponding private key must be signed, and the public key is stored in the digital certificate, which contains the audited applicant information. Therefore, the digital signature can have legal effect.

After reading this article, I believe you have a certain understanding of what the digital signature certificate is, want to know more about it, welcome to follow the industry information channel, thank you for reading!

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