Blog SERVER.UA

Category: Security Page 1 of 4

How SSL Certificate Types Differ and How to Make the Right Choice

By

On February 11, 2026

In Security

Three HTTPS options with different certificates for a personal site, business, and international project.
The type of certificate depends on the format and tasks of the site

An SSL certificate is a digital document that confirms the authenticity of a website and ensures a secure connection between the user’s browser and the server. Thanks to SSL, the data that a visitor enters on a website is transmitted in encrypted form and cannot be read by third parties. This applies to passwords, contact forms, payment information, and any personal data. For users, the presence of SSL is usually visible as a padlock icon in the browser’s address bar, while for a website it is a mandatory condition for trust, correct operation of many services, and proper ranking in search engines.

Read More

How the lack of time synchronization creates security issues for websites

By

On February 6, 2026

In Security

A server and a website connected by a broken chain, a warning icon next to the server, and a clock on top indicating a time synchronization problem between the systems.
Even minor technical discrepancies can disrupt the stable operation of the service

When it comes to website security, most owners think about passwords, SSL certificates, CMS updates, or protection against attacks. Time often seems like a secondary detail that cannot affect stability or security. In reality, correct time synchronization on a server is the foundation for many security mechanisms. If a server “lives” in its own time zone or is behind by several minutes, this can lead to serious problems that are not always immediately visible.

Read More

How an SSL Certificate Affects Mobile Users

By

On January 22, 2026

In Security

A person is holding a smartphone with an open website, https and a lock icon are visible in the address bar, and a green lock with a checkmark is displayed next to it in a pop-up message.
Secure connection as the basis for user trust when browsing sites from a smartphone

Mobile internet has become the main way millions of people access websites. A smartphone is always at hand: people read news, place orders, log into banking services and personal accounts from it. In this format of interaction, security stops being an abstract technical concept and directly influences user behavior. An SSL certificate in the mobile environment performs several important roles at once, which often go unnoticed but determine whether a person will trust a website and continue using it.

Read More

What Happens When an SSL Private Key Is Leaked

By

On January 21, 2026

In Security

A golden digital key with microchip elements is pointing towards a blue shield with a lock, against a background of clouds, binary code and technical security icons.
Private key as a critical element of protecting encrypted connections

When a user opens a website with a padlock in the browser, they rarely think about what actually stands behind this security symbol. An SSL certificate is a digital document that confirms the authenticity of a website and encrypts transmitted data. At the core of this system is the SSL private key. This is a secret file stored on the server and used to decrypt information encrypted with the public key. Simply put, the private key allows the server to “read” the data sent by the user’s browser. If this key falls into the hands of third parties, the security of the connection effectively ceases to exist.

Read More

What Is the Difference Between Renewing an SSL Certificate and Reissuing It

By

On December 26, 2025

In Security

A calendar and hourglass as a symbol of the expiration date of an SSL certificate and documents with a lock indicating its renewal and reissue.
Продовження та перевипуск SSL-сертифіката — у чому різниця?

For most users, an SSL certificate is just a “padlock” in the browser that indicates a website can be trusted. In reality, behind this padlock lies a complex technical mechanism that encrypts data between the user’s browser and the server. An SSL certificate confirms the authenticity of a website and protects the transmission of passwords, forms, payment information, and any other data. That is why keeping it valid is critically important. When the expiration date of a certificate approaches or the website’s parameters change, the owner faces two actions that may seem similar at first glance — renewal and reissue. Although these terms are often used as synonyms, in practice they refer to different processes with different consequences.

Read More

Why backup and replication are often confused

By

On December 16, 2025

In Security

A two-part scheme: data transfer from the server to a secure storage as a backup and synchronous data exchange between two servers as replication.
Backup and replication solve different data preservation and availability problems

In today’s digital world, data has become one of the most valuable resources. Photos, documents, websites, customer databases, accounting records — all of this is stored electronically and requires protection. When it comes to data security, two terms are mentioned most often: backup and replication. For many users, they sound similar because both involve copying information. However, in practice these are different approaches that solve different problems. Understanding this difference is important not only for system administrators, but also for website owners, businesses, and anyone who stores important data.

Read More

Can You Trust Free SSL Certificates

By

On December 11, 2025

In Security

SSL icon with a green lock next to the FREE certificate, a question mark, and the like and dislike gestures, symbolizing doubts about free SSL certificates.
Free SSL has advantages and limitations — it’s important to consider both sides

In today’s internet, users are accustomed to seeing the green padlock next to a website address and the letters https. For many, this symbol signals a safe resource where data is transmitted securely. However, an important question remains: can free SSL certificates — used by thousands of websites — be fully trusted? To answer this, it’s essential to understand how SSL works, how free certificates differ from paid ones, and what risks actually matter for businesses and users.

Read More

Why Bug Fixes Are Just as Important as System Updates

By

On December 4, 2025

In Security

A computer on a scale is contrasted with a box with an error, symbolizing the importance of bug fixes and updates.
Bug fixes maintain stability no less than system updates

In the modern digital environment, most users are accustomed to perceiving updates as something big and noticeable: new design, features, interfaces or capabilities that immediately catch the eye. Updates are associated with something significant that adds new potential to a system. At the same time, bug fixes — meaning corrections of errors in software — often seem less noticeable and even “boring.” However, in reality, they are fundamentally important and, in some cases, even more critical than large-scale updates. To understand why, it’s worth examining the nature of bugs, their impact on stability and security, and how to correctly evaluate the quality of software.

Read More

How Let’s Encrypt Changed the Architecture of Security

By

On November 28, 2025

In Security

A shield with a lock symbolizing data protection and secure internet connections.
How Let’s Encrypt made the internet safer

The emergence of Let’s Encrypt became one of the most important milestones in the history of internet security. Until 2015, obtaining an SSL or TLS certificate was a complex, expensive, and time-consuming process. Many website owners postponed switching to HTTPS because they had to navigate bureaucratic procedures, wait for certificate approval, and manually configure their servers. This created a paradox: the technology for protecting data existed, but access to it remained limited. Let’s Encrypt made security widespread, affordable, and automated — transforming not only the approach to encryption but also the architecture of the internet as a whole.

Read More

Why the Transition from HTTP to HTTPS Took 20 Years

By

On November 27, 2025

In Security

The screen shows HTTP with an open lock on the left, HTTPS with a closed lock on the right, and an hourglass in between.
The long journey from unencrypted connections to complete web traffic security

The transition of the internet from HTTP to HTTPS seems like an obvious step today, when secure connections have become the standard. However, this process stretched out for nearly two decades. Although HTTPS has existed since the late 1990s, its widespread adoption began only after 2015. The reasons for this delay lie in technical limitations, low availability of certificates, reluctance of website owners to change infrastructure, and even psychological factors. To understand why the entire world took so long to switch to a secure protocol, it’s important to look at the history, technologies, and context of internet development.

Read More

Page 1 of 4

Next

-->