The modern smartphone has become the repository of our digital life, and the model Samsung Galaxy A52 is no exception. Owners of this device are often looking for ways to restrict access to personal correspondence, banking applications or photo gallery from prying eyes. Unfortunately, the standard Android settings do not have one simple “Block all applications” button, which causes confusion among many users who are new to the Samsung ecosystem.
However, the company has provided powerful security tools built right into the One UI shell. You don't have to download dubious apps from the Internet to solve this problem. We will look at official methods of protection through the proprietary platform Knox, as well as alternative methods that will help you maintain the confidentiality of data on your device.
In this article we will examine in detail the process of setting up an isolated space and installing additional barriers. You will learn how to make sure that even if your phone is unlocked, an attacker will not be able to open your private data. This is especially true if you often give the phone to children or colleagues for calls.
Built-in data protection capabilities on Samsung
The shell One UIinstalled on Samsung A52is based on the security system Samsung Knox. This is multi-level protection that works at the hardware and software levels. Unlike conventional Android smartphones, the “sandbox” concept is implemented here, allowing you to create isolated environments for applications.
The main tool for hiding and blocking apps is the “Knox Folder” function (in new firmware versions it is often called “Secure Folder” or Secure Folder). This mechanism creates an encrypted space inside the phone's memory. Apps moved there require separate authentication to run, regardless of whether the phone itself is unlocked.
⚠️ Warning: The Secure Folder feature may not be available if you use a corporate Google Account or if the device was flashed with unofficial software. In such cases, Knox security may be disabled permanently.
Using built-in tools is preferable to third-party solutions, since they have priority access to system resources and do not drain the battery as much as background blocker processes. In addition, the data inside the protected container is encrypted with a separate key.
Before setting up, make sure that you have configured the screen lock method (PIN code, pattern or fingerprint), since the Secure Folder inherits these settings or requires you to set your own.
Setting up the Secure Folder
To start the protection process, you need to activate the corresponding module in the system settings. This will create a separate shortcut on your desktop that will act as a “safe” for your data. The setup process is intuitive and takes no more than a couple of minutes.
First, go to the main settings of your smartphone. Find the section responsible for biometrics and security. In the menu Samsung A52 this item is usually called Biometrics and Security. Scroll down the list until you find the desired option.
After clicking, the system will prompt you to accept the terms of use of the Knox service. Agree with them to continue. Next, you will be asked to select a login method. You can use the same fingerprint as to unlock the screen, or set a separate PIN code for greater privacy.
☑️ Activating protection
When the setup is complete, a new icon will appear on the desktop. By default, the folder may be empty. To add applications there, click on the “plus” icon inside the folder interface or use the context menu of the application icon on the main screen by selecting “Add to Secure Folder.”
Setting a password for specific applications
Once you have moved the necessary apps (for example, WhatsApp, Bank or Gallery) inside the protected container, they become completely isolated. Now, when you try to open them, the system will ask for identity confirmation.
It is important to understand the difference between a copy and an original. When you add an application to Secure Folder, a second, independent copy of it is created. You can log into one account in the regular application and another in the protected one. This is convenient for separating work and personal chats.
The same authentication methods that you configured when creating the folder are used to log into protected applications. This could be:
- 🔒 A graphic key different from the main one
- 👆 Fingerprint (the fastest way)
- 🔢 PIN code of 4 or 6 digits
- 😐 Facial recognition (less reliable, but convenient)
If you want to change the login method later, go inside the folder, click on the three dots in the upper corner and select Settings. There you can switch from fingerprint to password or vice versa. This gives flexibility in situations where a finger is injured or wet hands prevent you from using the scanner.
What happens if you forget the password for a folder?
If you forgot the password and did not set up a backup login method (for example, a Samsung account), it will be impossible to restore access to the data inside the folder. The system will prompt you to reset the folder, but all data inside it will be permanently deleted.
Alternative methods of blocking through third-party launchers
Sometimes users need to block applications without moving them to an isolated environment, or the Knox function does not work for some reason. In such cases, third-party shells come to the rescue - launchers that replace the standard Android desktop.
Popular solutions, such as Nova Launcher or specialized blockers like AppLock, allow you to set a password to launch any installed application. The principle of their operation is to intercept the launch event and overlay the password entry window on top of the app interface.
However, this method has significant drawbacks. Third-party blocker apps often require extensive permissions, including access to accessibility features (Accessibility Service), which theoretically reduces the overall security of the device. In addition, they may conflict with One UI system updates.
If you still decide to use third-party software, choose only proven solutions with a high rating in Google Play. Avoid little-known utilities that promise “super protection” but may actually contain adware or spyware.
Smart Lock function and its limitations
There is also a function in Android security settings Smart Lock. It allows you to keep your phone unlocked in certain conditions, for example, when it is in your pocket, connected to a Bluetooth headset, or at home.
Many users mistakenly believe that Smart Lock can lock specific applications. In fact, this feature works the other way around: it disables locks the screen in trusted zones. This means that if you set up Smart Lock for your home, then anyone who takes your phone at home will have access to all data without a password.
Smart Lock is not suitable for protecting specific apps on Samsung A52 . Moreover, using this feature in combination with Secure Folder may create a vulnerability if exceptions are not configured. Always check in what situations the phone remains open.
| Protection method | Reliability level | Impact on the battery | Setting up complexity |
|---|---|---|---|
| Secure folder (Knox) | High (hardware encryption) | Minimum | Low |
| Third-party AppLock | Medium (software bypass) | Medium (background process) | Medium |
| Screen lock | Basic (protects the entire phone) | None | Low |
| Smart Lock | Low (reduces protection) | Medium (search for zones/devices) | High |
Manage notifications and hide content
Even if the application is locked with a password, notifications from it may appear on the lock screen or in the curtain, revealing the essence of the correspondence. To ensure complete privacy on Samsung A52, you need to configure the display of content.
Go to the notification settings for a specific application. In section Secure folder there is a separate option “Hide contents”. When you activate it, instead of the text of the message, you will only see the inscription “Notification from WhatsApp” or the sender’s name without the text.
It is also recommended to disable message previews in the settings of the messenger itself. This is double protection: even if someone gains access to the phone when a message arrives, they will not be able to read its contents without entering the password into the application.
⚠️ Attention: The settings interface may vary slightly depending on the version of Android (11, 12, 13 or 14) and the version of the One UI shell. If you don't find an item, use the settings search (magnifying glass icon at the top).
The best security strategy is a combination of Secure Folder for critical applications and hiding the contents of notifications for everyone else.
Frequently asked questions (FAQ)
Is it possible to set a password for standard Gallery without creating a folder?
You cannot directly set a password for the standard Gallery application in Samsung settings. The only official way is to move photos and videos to the “Secure Folder”. After moving, they will disappear from the general gallery and will only be available inside the safe.
What should I do if I deleted the Secure Folder shortcut from the desktop?
The folder itself has not gone away, only its shortcut is hidden. To return it, go to Settings -> Screen (or Display) and find the item Secure folder icon. Switch the toggle switch to the “On” position, and the icon will appear in the application menu again.
Will notifications come from applications in the Secure Folder?
Yes, notifications do come, but they are marked with a special lock icon. You can configure their display so that the message text is not visible until you enter your password. This is done in the settings of the folder itself through the “Notifications” menu.
Is it possible to use two different WhatsApp accounts at the same time?
Yes, this is one of the most popular functions. You install WhatsApp normally for one number, and then add a second WhatsApp application inside the Secure Folder for the second number. Both will work independently of each other.
Will the phone reset its security settings when updating the firmware?
Usually a software update does not affect Knox settings and passwords. However, in rare cases, during major Android updates, the system may require re-verification of your Samsung account. Always remember your Samsung account password, as it is the recovery key.