Security – Blog SERVER.UA

How an SSL Certificate Affects Mobile Users

On January 22, 2026

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.

What Happens When an SSL Private Key Is Leaked

By Микола

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.

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

By Микола

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.

Why backup and replication are often confused

By Микола

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.

Can You Trust Free SSL Certificates

By Микола

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.

Why Bug Fixes Are Just as Important as System Updates

By Микола

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.

How Let’s Encrypt Changed the Architecture of Security

By Микола

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.

Why the Transition from HTTP to HTTPS Took 20 Years

By Микола

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.

How Backup Frequency Affects the Risks of Data Loss

By Микола

On November 27, 2025

In Security

Cloud backup next to calendar, clock and server disks. — How the rarity or frequency of backups determines the amount of potential loss after a failure

Backup, or data copying, is the process of creating copies of information that can be restored in case of a failure, error, or cyberattack. Although the idea itself seems simple, it is the frequency of creating backups that determines how serious the consequences of data loss may be. Some companies make backups once a day, others every hour, and some use complex automated scenarios. But regardless of business size, it is the regularity of saving copies that determines how much information you risk losing in case of an incident. Backup frequency directly affects the so-called recovery point, or RPO, which shows the amount of time for which data may be lost without critically affecting system operation.

Why a VPN Does Not Guarantee Privacy When You Use Mobile Internet

By Микола

On November 19, 2025

In Security

Smartphone with activated VPN between user and cell tower, with geolocation and surveillance icons. — VPN privacy limitations when using mobile internet

A VPN has long become a tool that most users perceive as a universal means of protecting privacy. It creates an encrypted tunnel between your device and the VPN provider’s server, hiding your IP address and making data interception more difficult. However, when it comes to mobile internet, this mechanism does not work as flawlessly as it may seem. Even with the best VPNs, the user does not always receive full privacy, and the mobile operator still retains a significant amount of information about your activity. To understand why this happens, you need to understand how mobile internet works, what data the operator has, and what limitations the VPN itself has.

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