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 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.
What is CA certification? 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 identity of users and sign user certificates to ensure the identity of certificate holders.
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 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
A certificate is actually the authentication of a user's public key issued by a 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 the transmitted information (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 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 summary (digital fingerprint) for any input message data and output it;
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 information, the receiver uses the following steps to verify your signature:
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 to generate 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 Internet, intranet or extranet, digital certificate is 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 own 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.
Integrity-information will not be tampered with during transmission.
Non-repudiation-the sender cannot deny the information sent.
What is education CA? What is electronic authentication in education? Education Electronic Certificate Authority (CA) is approved by the people of China and the Ministry of Education, passed the security review of the National Cryptography Administration, and is headed by the Education Management Information Center of the Ministry of Education, providing electronic certification for the education industry (including educational institutions, educators and educational equipment).
What is the CA certification channel? The full English name of CA is Certificate Authority, which is the abbreviation of Digital Certificate Certification Center, and refers to the institution that issues, manages and revokes digital certificates. The role of CA is to check the legitimacy of the identity of certificate holders, issue certificates (sign certificates), prevent certificates from being forged or tampered with, and manage certificates and keys.
What is a CA certification body? What is a Certificate Authority (CA)? CA is a certificate management organization and a third-party organization or company entrusted to issue digital certificates. Digital certificates are used to establish digital signatures and public-private key pairs.
The role of CA in this process is to ensure that the person who obtains this unique certificate is the licensee himself. In data security and e-commerce, CA is a very important part, because they guarantee the identities of all parties in information exchange.
What is a security certificate (CA)? The electronic security certificate is issued by the certification center. Terms of use of electronic security certificate Please read carefully and abide by the provisions of this clause when applying for an electronic security certificate from Bank of China: 1. When applying for an electronic security certificate, the cardholder shall guarantee to provide the latest and true personal and debit card account information to the Bank of China. 2. Bank of China has the right to examine and approve electronic security certificates. After the cardholder submits the application materials, the Bank of China will give a reply of approval or rejection according to the specific circumstances. Whether the application is approved or not, Bank of China has the right to keep all the information provided by the cardholder, and the cardholder shall not raise any objection. 3. In order to realize online transactions, cardholders allow banks and related parties to know or use the necessary information of their debit card accounts. 4. The electronic security certificate is stored in the cardholder's electronic wallet, and the cardholder shall properly keep the electronic security certificate and personal password to ensure the security of online transactions. All losses caused by the loss or misappropriation of the electronic security certificate and password by others shall be borne by the cardholder. 5. If the cardholder finds or suspects that the electronic security certificate and password have been lost or stolen by others, he should immediately report the loss of the used debit card to China Bank (see the Articles of Association of RMB Great Wall Electronic Debit Card of China Bank for specific provisions). Cardholders can apply for an electronic security certificate again after getting a new card. 6. The cardholder's Great Wall electronic debit card and related passbook are lost. Please refer to Article 5 above. 7. Disputes arising from the use of electronic security certificates by cardholders and merchants for online consumption shall be settled by both parties themselves, and Bank of China shall not intervene in such disputes. 8. Bank of China has the right to modify and interpret this clause. For the modification of this clause, Bank of China shall publish the modification notice and contents on the website of Bank of China 30 days in advance, and it shall be deemed that the cardholder has received it. 9. After the cardholder applies for the electronic security certificate and is approved by the Bank of China, this clause constitutes a part of the contract between the cardholder and the Bank of China, and is bound by the relevant laws, regulations and provisions of the Bank of China.
What is a ca certificate? What is the specific function of ca certification? CA certificate is mainly used for online annual inspection of industrial and commercial business license, and can also be used when logging on the website of the tax bureau.
What is mfi certification? What is wwi certification? MFI ("Made for iPod") certification is authorized by Apple to meet the performance standards of Apple products.
Apple has clear mandatory requirements for all authorized dealers. For Apple's functional accessories products, it is necessary to sell accessories products of certified authorized brands. Otherwise, Apple will not make any warranty for the damage caused by the use of products with unauthorized accessories.
Apple requires MFI certification and WWI certification for its peripheral products and accessories. Obtaining this certification means that the product has better compatibility and safety with Apple.