What is the HTTPS website certificate public key? Detailed explanation of core concepts and functions

in the HTTPS encrypted communication system, there is a crucial core component that is easily overlooked by ordinary users. It is the basis for ensuring the encrypted transmission of data and the key carrier of the credibility of the website's identity. Many people only know that HTTPS can make the website more secure, but they do not know the encryption logic behind it, especially the key system. This article will focus on the HTTPS website certificate public key, from the core concept, operation mechanism to the actual function, verification method and other dimensions, for the reader to comprehensively dismantle the core elements of this website security.

What is the HTTPS website certificate public key?

to understand the HTTPS website certificate public key, we must first start with the encryption logic of HTTPS, which is the core component of the asymmetric encryption system.

1, core definition analysis

HTTPS website certificate public key is a public key attached to the digital certificate issued by the CA authority, which forms a pair of asymmetric encryption keys with the corresponding private key. Unlike the private key stored privately by the website server, the HTTPS website certificate public key is publicly available. When a user visits an HTTPS website, the browser will automatically extract the public key from the website certificate for subsequent encrypted communication.

2, collaborative logic with private key

HTTPS website certificate public key and private key work together, and the two follow the core rules of asymmetric encryption: data encrypted with the HTTPS website certificate public key can only be decrypted by the corresponding private key; conversely, data encrypted with the private key can only be decrypted by the corresponding HTTPS website certificate public key. This feature allows it to ensure the security of data transmission, and to achieve trusted verification of the identity of the website, so as to avoid third parties impersonating the website to steal information.

2. The core role of HTTPS website certificate public key?

HTTPS website certificate public key is not just an abstract encryption symbol, it plays a number of key roles in the whole process of HTTPS communication, directly affecting the security level of the website.

1, ensure data transmission encryption

the user visits the HTTPS website, the browser will first use the HTTPS website certificate public key to encrypt the generated session key, and then send the encrypted session key to the website server. After the server decrypts with the private key, both parties can use the session key for symmetric encrypted communication, which not only ensures the security of data transmission, but also takes into account the efficiency of encryption and decryption to avoid the problem of slow asymmetric encryption speed.

2, verify the credibility of the website identity

HTTPS website certificate public key also assumes the role of website authentication. When issuing a certificate, the CA authority will use its own private key to sign the certificate information and the HTTPS website certificate public key. The user browser has a built-in CA authority's root certificate, which can verify the signature of the website certificate through the public key in the root certificate, confirm the legitimacy of the HTTPS website certificate public key, and determine whether the currently visited website is a real and credible official website to avoid fraud from phishing websites.

How to verify the HTTPS website certificate public key?

since the HTTPS website certificate public key is the key to website security, users and website administrators need to master the method of verifying it to ensure the security of the communication environment.

1, browser verification method for ordinary users

ordinary users do not need complicated operations, the browser will automatically complete the verification of the HTTPS website certificate public key. When visiting the website, click the lock icon in the address bar to enter the certificate details page to view the specific information of the HTTPS website certificate public key. At the same time, the browser will automatically verify the valid period of the certificate, the authority and the legitimacy of the signature. If there is a risk, a warning prompt will be given in time.

2, professional verification method for webmasters

webmasters can manually extract and verify the HTTPS website certificate public key through professional tools such as OpenSSL. Connect to the website server through command-line tools, extract the certificate file, use specific commands to parse the HTTPS website certificate public key, and then pair with the private key saved in the server for verification to ensure the consistency of the key pair and avoid encrypted communication failures caused by key mismatches.

4. Management points of HTTPS website certificate public key?

for website operators, although the management of HTTPS website certificate public key does not require private storage, there are also many details that need to be paid attention to, which directly affects the security and stability of the website.

1, certificate update synchronization public key

when the website to replace or update the HTTPS certificate, HTTPS website certificate public key will be updated, this time need to ensure that the server configuration synchronization update, while notifying the CDN and other third-party services to synchronize the new certificate information, to avoid HTTPS website certificate public key mismatch caused by user access security warnings, affecting the normal access of the website and user trust.

2, public key algorithm selection

different encryption algorithms correspond to different HTTPS website certificate public key strengths. At present, the mainstream is the RSA algorithm and the ECC algorithm. Under the same security strength, the ECC algorithm has a shorter public key length and faster encryption and decryption speed. It is suitable for mobile websites and scenes with high performance requirements. Webmasters need to choose the appropriate encryption algorithm to generate the HTTPS website certificate public key according to their own business needs, and find a balance between security and performance.

To sum up, the HTTPS website certificate public key is the core component in the HTTPS encrypted communication system. It is not only the basis of data encryption transmission, but also the key carrier of website authentication. From the core definition to the collaborative logic, from the encryption function to the verification management, every link directly affects the security level of the website. Mastering the relevant knowledge of the HTTPS website certificate public key, whether it is ordinary users identifying the security of the website or the webmaster ensuring the safe operation of the website, has a crucial practical value.