About cybersecurity | ssl security certificate

Complete Guide to DV Certificate Application: From Purchase to Issuance, Step-by-Step Instruction

DV certificates have the lowest trust level in the SSL/TLS certificate system, but also the lowest application threshold. Why is the threshold low? Because it only verifies your control over the domain name, not your organizational identity.

Why are free DV certificates only valid for 3 months or 1 year?

Regarding the validity period of free DV certificates, many people's first reaction is that "vendors are stingy"—after all, paid certificates can be purchased for two or even three years, while free ones only offer three months or a year, clearly aiming

The complete process of domain name resolution: what happens from entering a URL to displaying a webpage.

Typing www.example.com into your browser's address bar and pressing Enter, the webpage appears on the screen—a process so fast you can barely feel the delay. But in those few hundred milliseconds, a multitude of devices on the internet

A comprehensive analysis of firewall deployment methods: From the perimeter to the cloud, which model is best suited for your business?

As the first line of defense for network security, the deployment method of a firewall directly determines

How to adjust the TTL value for domain name resolution? Techniques for balancing activation speed and DNS query pressure.

TTL is something you see every day in your domain name resolution backend—that little box with 600 defaults and "seconds" written on it. Most people just see the default value, are too lazy to change it, and save it directly. Some people are impatient

How to configure domain name resolution after using CDN? Point the CNAME record to the CDN domain!

Connecting a domain to a CDN boils down to two steps: first, add the domain to the CDN, then modify a DNS record in the DNS management console. However, even this simple "modifying a DNS record" involves several intricacies, and can

Can individuals apply for EV certificates? Why can only companies apply?

EV certificates, or Extended Validation SSL/TLS certificates, were strictly limited from their inception by international standards (the EV guidelines developed by the CA/Browser Forum) to be issued only to "legitimate registered businesses,

How long is an EV certificate valid? A breakdown of the new rules from the CA/B Forum in 2026!

EV certificates (Extended Validation Certificates) have long been recognized as having the highest level of trust in the digital certificate system, not only because of their rigorous verification process, but also because they directly display

How long does it take to issue a DV certificate after application?

The most frequent question from users applying for DV certificates (Domain Validated Certificates) is: "I've submitted my application, how long will it take?" Many official documents will tell you "10 minutes to 1 day," a very wide and flexible range.

DV certificate verification passed but issuance delayed? Explanation of CA institution polling mechanism.

When applying for a DV certificate, many people encounter a perplexing situation: the domain verification check shows "passed," and the verification files are confirmed to be accessible, but after waiting for several hours or even a day, the certificate