What is a CA certificate? What is the function of CA certificate? How to use CA certificate? CA is the issuing authority of certificate and the core of PKI. CA is the authority responsible for issuing certificates, authenticating certificates and managing issued certificates. It should formulate policies and specific steps to verify and identify the user's identity, and sign the user's certificate to ensure the identity of the certificate holder and the ownership of the public key. .
A CA also has a certificate (including a public key) and a private key. Public users on the Internet trust CA by verifying its signature, and anyone can get CA's certificate (including public key) to verify the certificate issued by it.
If a user wants to obtain a certificate of his own, he should apply to CA first. After the CA recognizes the identity of the applicant, it assigns a public key to it, and the CA binds the public key to the identity information of the applicant, and forms a certificate after signing it and sends it to the applicant.
If the user wants to verify the authenticity of another certificate, he will use the CA's public key to verify the signature on that certificate. Once the certificate is verified, it is considered valid.
certificate
[1] certificate is actually the authentication of user's public key issued by certificate authority (CA).
The contents of the certificate include: information of the electronic visa authority, public key user information, public key, authority signature and validity period, etc. At present, the format and verification method of certificates generally follow the international standard X.509
Encryption:
The process of converting words into unreadable form (that is, ciphertext) is called encryption.
Decryption:
The process of converting ciphertext into directly readable text (that is, plaintext) is called decryption.
How to achieve the purpose of signing an electronic document? We can use digital signatures. RSA public key system can realize the digital signature of digital information by the following methods:
The information sender uses its private key to perform RSA algorithm operation on the characteristic data (or digital fingerprint) extracted from the transmitted message, thus ensuring that the sender cannot deny that the message has been sent (i.e. non-repudiation), and at the same time ensuring that the information message has not been tampered with (i.e. integrity) during transmission. When the information receiver receives the message, he can verify the digital signature with the sender's public key.
Digital fingerprint is generated by a special HASH function (hash function) and plays an important role in digital signature. The special requirements of these hash functions are:
1. The accepted input message data has no length limit;
2. Generate a fixed-length abstract (digital fingerprint) output for any input message data;
3. The abstract can be easily calculated from the message;
4. It is difficult to generate a message for the specified abstract, from which the specified abstract can be calculated;
5. It is difficult to generate two different messages with the same summary.
Verification:
After receiving the message, the receiver verifies your signature by the following steps:
1. Convert information into plaintext with your own private key;
2. Use the sender's public key to obtain the original abstract from the digital signature part;
3. The receiver hashes the source information you sent and generates a summary;
4. The receiver compares the two abstracts, and if they are the same, it can prove the identity of the information signer.
If the contents of the two abstracts are inconsistent, what are the reasons?
The private key that may be used for abstract signature is not the private key of the signer, which means that the signer of the information cannot be trusted; It is also possible that the information received is not the information sent by the signer at all, and the information has been destroyed or tampered with during transmission.
Digital certificate:
A: Digital certificates provide electronic authentication for secure communication between the two parties. In the Internet, intranet or external network, digital certificates are used to realize identity identification and electronic information encryption. Digital certificate contains the identity information of the owner of the key pair (public key and private key), and the identity of the certificate holder can be authenticated by verifying the authenticity of the identity information.
What can I do with a digital certificate?
Digital certificate is attached with user information and CA's signature after the user's public key. The public key is one part of the key pair, and the other part is the private key. The public key is public and can be used by anyone. Only you know the private key. Information encrypted with a public key can only be decrypted with the corresponding private key. In order to ensure that only one person can read his letter, the sender should encrypt the letter with the public key of the receiver; The recipient can decrypt the letter with his own private key. Similarly, in order to confirm the identity of the sender, the sender should sign the letter with his own private key; The receiver can use the sender's public key to verify the signature to confirm the sender's identity.
You can use digital certificates to verify the identity of the other party in online transactions. Encrypting information with digital certificate can ensure that only the receiver can decrypt and read the original text, as well as the confidentiality and integrity of the information during transmission. Only with digital certificates can we achieve online security and ensure the safety of e-mail, online transactions and credit card shopping.
Several problems solved by authentication, digital certificate and PKI.
Confidentiality-Only the recipient can read the information.
Authenticity-Confirm the identity of the sender of the information.
Integrity-information will not be tampered with during transmission.
Non-repudiation-the sender cannot deny the information sent.
My brother is a computer student. ? I remember studying e-commerce before.
What is a "CA certificate"? CA is the authority responsible for issuing certificates, authenticating certificates and managing issued certificates. It should formulate policies and specific steps to verify and identify the user's identity, and sign the user's certificate to ensure the identity of the certificate holder and the ownership of the public key. Public users on the Internet trust CA by verifying its signature, and anyone can get CA's certificate (including public key) to verify the certificate issued by it.
Mbth certificate authority name; CA certificate
Issuer; Canada
Include content; Contains a public key and a private key.
Verify the authenticity of the use; CA public key for authentication.
In daily project bidding, it is often necessary to provide CA certificates, which are registered by enterprises or individuals on relevant websites. After paying the relevant fees, you can get the corresponding verification methods (including public key and private key). The CA website will identify the applicant according to the information submitted. If the information is correct, CA will bind the public key with the identity information of the applicant and sign it, and then form a certificate and send it to the applicant.
The contents of CA certificate include: information of electronic visa institution, information of public key user, public key, institution signature and validity period, etc.
At present, CA certificate is used more and more in solar energy engineering industry, and a number of large solar energy enterprises represented by Four Seasons Muge Solar are using it.
What is the CA certificate of local tax? The local tax CA certificate is equivalent to a key, a key to the local tax website, without which you will not be able to log in.
A CA also has a certificate (including a public key and a private key). Public users on the Internet trust CA by verifying its signature, and anyone can get CA's certificate (including public key) to verify the certificate issued by it.
If a user wants to obtain a certificate of his own, he should apply to CA first. After the CA recognizes the identity of the applicant, it assigns a public key to it, and the CA binds the public key to the identity information of the applicant, and forms a certificate after signing it and sends it to the applicant.
The contents of the certificate include: information of the electronic visa authority, public key user information, public key, authority signature and validity period, etc. At present, the format and verification method of certificates generally follow the international standard X.509
What is the national tax ca certificate? CA certificate is issued by digital center. Its main function is to allow taxpayers to make routine tax returns through electronic channels, which avoids the trouble of taxpayers carrying paper to and from tax departments and enterprises. At present, many taxpayers use it.
What is a CA certificate, what is its function, and which institution issued it? Also known as e-commerce certification authority (CA), it is the authority responsible for issuing and managing digital certificates. As a trusted third party in e-commerce transactions, it is responsible for verifying the legitimacy of public keys in public key systems.
CA is the issuing authority of certificate and the core of PKI. CA is the authority responsible for issuing certificates, authenticating certificates and managing issued certificates. It should formulate policies and specific steps to verify and identify the user's identity, and sign the user's certificate to ensure the identity of the certificate holder and the ownership of the public key. .
A CA also has a certificate (including a public key) and a private key. Public users on the Internet trust CA by verifying its signature, and anyone can get CA's certificate (including public key) to verify the certificate issued by it.
Authentication authorization
If a user wants to obtain a certificate of his own, he should apply to CA first. After the CA recognizes the identity of the applicant, it assigns a public key to it, and the CA binds the public key to the identity information of the applicant, and forms a certificate after signing it and sends it to the applicant.
If the user wants to verify the authenticity of another certificate, he will use the CA's public key to verify the signature on that certificate. Once the certificate is verified, it is considered valid.
CA certificate. What kind of certificate is a CA certificate? It is the authority responsible for issuing and managing digital certificates. As a trusted third party in e-commerce transactions, it is responsible for verifying the legitimacy of public keys in public key systems.
CA is the issuing authority of certificate and the core of PKI. CA is the authority responsible for issuing certificates, authenticating certificates and managing issued certificates. It should formulate policies and specific steps to verify and identify the user's identity, and sign the user's certificate to ensure the identity of the certificate holder and the ownership of the public key. .
A CA also has a certificate (including a public key) and a private key. Public users on the Internet trust CA by verifying its signature, and anyone can get CA's certificate (including public key) to verify the certificate issued by it.
Authentication authorization
If a user wants to obtain a certificate of his own, he should apply to CA first. After the CA recognizes the identity of the applicant, it assigns a public key to it, and the CA binds the public key to the identity information of the applicant, and forms a certificate after signing it and sends it to the applicant.
If the user wants to verify the authenticity of another certificate, he will use the CA's public key to verify the signature on that certificate. Once the certificate is verified, it is considered valid.