How to find certificates on Android: system, user and SSL

Certificates for Android are digital “passports” that confirm the authenticity of applications, sites and network connections. They provide data encryption, protection against phishing, and correct operation of corporate systems. But where to look for them if you need to verify the authenticity of a site’s SSL certificate, export a root certificate for a VPN, or delete a suspicious user certificate?

In this article, we will look at all the ways to access certificates on Android —from built-in system ones to manually installed ones. You will learn how to view them through device settings, use ADB for in-depth analysis, and where certificate files are stored in the file system. We will pay special attention to security: why some certificates cannot be deletedhow to distinguish a legitimate certificate from a malicious one and what to do if the device displays the error “The certificate is not trusted.”

1. Where are certificates stored in Android settings

The easiest way to find certificates is through the standard settings menu. The path may differ slightly depending on the version Android and the manufacturer's shell (for example, MIUI, One UI or ColorOS), but the general logic remains the same.

Open Settings → Security → Advanced → Encryption and Credentials → User Certificates. All manually installed certificates (for example, for corporate VPN or Wi-Fi networks) are displayed here. System certificates, which are pre-installed in the firmware, are usually hidden from the user, but they can be viewed through ADB or the file system.

• 📱 User certificates: installed by you or applications (for example, OpenVPN or FortiClient). They can be deleted.
• 🔒 System certificates: built into the firmware, they are responsible for trust in popular sites (for example, Google Internet Authority). They cannot be deleted without root access.
• ⚠️ Wi-Fi/VPN Certificates: may appear in this section if the network requires certificate authentication (for example, EAP-TLS).

⚠️ Attention: If in the list of user certificates you see unknown entries (for example, with unreadable names or from unfamiliar publishers), this may be a sign of malware. Check your device with an antivirus (for example, Malwarebytes or Dr.Web).

2. How to view certificates via ADB (for advanced users)

If you need to get a complete list of certificates (including system ones), use Android Debug Bridge (ADB). This method requires enabled mode USB debugging and installed drivers ADB on the computer.

Connect the device to the PC and run the commands:

adb shell
pm list packages -f | grep -i"cert" # Search for packages associated with certificates
ls /system/etc/security/cacerts/ # List of system certificates
ls /data/misc/user/0/cacerts-added/ # User certificates

To export the certificate (for example, for analysis), copy it to your computer:

adb pull /system/etc/security/cacerts/.0 C:\certs\

• 🖥️ System certificates stored in /system/etc/security/cacerts/ format .0 (for example, a0d4b829.0).
• 📁 User - in /data/misc/user/0/cacerts-added/ (root access is required for access).
• 🔍 To analyze certificates, use utilities OpenSSL or online services like SSL Checker.

⚠️ Attention: Changing or deleting system certificates without root access can lead to malfunctions of the browser, applications and network connections. Backup (adb backup) before experiments is mandatory.

3. Checking SSL certificates of sites in the browser

If you need to check the security certificate of a specific site (for example, if you receive an error “Your connection is not secure”), do it directly in the browser. data-i="97">for Google Chrome or Mozilla Firefox For Android the algorithm is the same:

1. Open the site whose certificate you want to check.
2. Click on the lock icon in the address bar → Certificate information (or Connection secure).
3. Look at the data: issuer, validity period, encryption algorithm.

If the certificate is expired or issued by an unknown center (not DigiCert, Let's Encrypt, GlobalSign etc.), the browser will block access. In corporate networks this happens due to the use of internal Certification Authorities (CA) - in this case you need to install their root certificate manually (see section 5).

Error browser	Possible reason	Solution
NET::ERR_CERT_DATE_INVALID	The certificate is expired or not yet valid	Update the date/time on the device or contact the site administrator
ERR_CERT_AUTHORITY_INVALID	Certificate issued by an unknown CA	Install the root CA certificate manually
SSL_ERROR_BAD_CERT_DOMAIN	The domain name does not match the certificate	Check the URL for typos or use a VPN

4. Search for certificates in the file system (with root access)

If you have root access, you can manually view all certificates in the file system. Any file manager with root support will do for this (for example, Solid Explorer or FX File Explorer).

Main folders with certificates:

• 📂 /system/etc/security/cacerts/ — system root certificates (format .0 or .pem).
• 📂 /data/misc/keystore/ — user certificates and keys.
• 📂 /data/misc/user/0/cacerts-added/ — certificates installed by the user.

Certificates in folder /system/etc/security/cacerts/ have non-standard extensions (for example, a0d4b829.0To read them, rename the file to .pem and open with a text editor or via OpenSSL:

openssl x509 -in a0d4b829.pem -text -noout

⚠️ Attention: Removing or system certificates in folder /system can lead to bootloop (loopy reboot of the device). Always make a backup before making changes.

How to recover deleted system certificates?

If you accidentally deleted a system certificate, the only way to restore it is to reflash the device or return it. backup folder /system/etc/security/cacerts/ via TWRP or ADB sideload.

5. Installing user certificates (for VPN, Wi-Fi, corporate networks)

Sometimes you need to install a certificate manually - for example, to connect to a corporate one VPN (for example, Cisco AnyConnect or Fortinet) or Wi-Fi with certificate authentication (EAP-TLS). To do this:

1. Download the certificate in the format .crt, .cer or .p12 (for example, from a corporate portal).
2. Open the file - the system will prompt you to install the certificate. Enter the name and select VPN and application or Wi-Fi depending on the purpose.
3. If necessary, enter the password (for .p12 or .pfx).

After installation, the certificate will appear in Settings → Security → User certificates. For corporate networks, additional configuration of a VPN or Wi-Fi profile may be required indicating Certificate ID (for example, com.android.credentials.USER).

Certificate format	Purpose	Password required?
.crt, .cer	Public certificate (for example, for SSL verification)	No
.p12, .pfx	Personal certificate with private key (for VPN/Wi-Fi)	Yes
.pem	Universal format (can contain keys)	Depends on the content

6. Exporting certificates from Android to PC

If you need to transfer a certificate from Android to another device or analyze it on a PC, use one of these methods:

• 📱 Through settings: Open the certificate in Settings → Security → User certificates, click on it and select Export (not available on all devices).
• 🖥️ Via ADB:

  adb pull /data/misc/user/0/cacerts-added/.0 C:\export\

  Then rename the file to .pem and open in OpenSSL.

• ☁️ Via the cloud: Upload the certificate to Google Drive or send it to yourself via email directly from your device.

For certificates in the format .p12 or .pfx a password may be required. If you forget it, you will not be able to restore the data - you will have to request a new certificate from the network administrator.

⚠️ Attention: Store exported certificates with private keys (.p12) in a secure place. Their theft may allow attackers to gain access to corporate resources.

7. Removing unnecessary or suspicious certificates

If unknown entries appear in the list of user certificates, they should be deleted. This could be a sign of malware or surveillance. To remove:

1. Go to Settings → Security → User certificates.
2. Select a suspicious certificate and click Delete.
3. Reboot device.

System certificates cannot be deleted without root access. If you need to disable trust in a specific certification authority (for example, due to a key leak), you will have to use ADB or specialized tools like Xposed Framework (requires root).

After removal, check:

• 🔄 Are corporate ones working? VPN/Wi-Fi (if the certificate was needed, the connection will break).
• 🌐 Are sites that previously gave SSL errors opening?
• 🛡️ Are there any new suspicious certificates (if they appear again, there may be malware on the device).

8. Frequent errors and their solutions

Working with certificates Android is often accompanied by errors. Here are the most common ones and how to fix them:

Error	Cause	Solution
java.security.cert.CertPathValidatorException	The certificate chain is broken (there is no intermediate CA)	Install all intermediate certificates from the chain
ERR_CERT_COMMON_NAME_INVALID	The name in the certificate does not match the domain	Check the URL for typos or use the IP address
User certificate not found (in VPN)	The user certificate is not installed	Reinstall the certificate and check linking it to the VPN profile
Failed to install certificate	Incorrect file format or damaged certificate	Check the file on another device or request a new one

If the error persists, try:

1. Clear the cache and data of the application that is throwing the error (for example, a browser or VPN client).
2. Update Android to the latest version - new firmware often fixes problems with certificates.
3. Reset network settings (Settings → System → Reset → Reset settings network).

⚠️ Attention: Some devices (for example, Huawei or Xiaomi) may have additional restrictions on working with certificates due to modified firmware. In this case, please refer to the manufacturer's instructions.

FAQ: Answers to common questions. questions

Is it possible to delete system certificates without root access?

No, system certificates are protected from changes. They can only be deleted with root access or by flashing the device. Attempts to bypass this protection can lead to system failures.

How to check if the certificate is forged. website?

Compare the fingerprint (fingerprint) of the certificate with the official data of the site. To do this:

1. Export the certificate from the browser (see section 3).
2. Get its fingerprint via OpenSSL:

   openssl x509 -in certificate.crt -noout -fingerprint -sha256

3. Compare the result with the data on the website (usually published in the section Security or SSL Info).

If the fingerprints do not match, the certificate is fake or intercepted (for example, through a MITM attack).

Why does the VPN not connect after installing the certificate?

Possible reasons:

• The certificate is installed in the wrong storage (you must select VPN and applications during installation).
• The root CA certificate is missing (install it separately).
• Certificate has expired (check in Settings → Security).
• VPN client does not support the protocol used (for example, IKEv2 instead OpenVPN).

Check the connection logs in the VPN application - usually there the exact reason for the error is indicated.

Where are certificates for Wi-Fi with EAP-TLS stored?

Certificates for authentication by EAP-TLS are stored in:

• /data/misc/wifi/WifiConfigStore — network configurations.
• /data/misc/keystore/ — user keys and certificates.

Access to these folders is only possible with root access. Without them, you can only delete the network in the Wi-Fi settings and reconfigure the connection.

Can certificates be transferred to another Android device?

Yes, but with reservations:

• User certificates (.crt, .p12) can be exported (see section 6) and installed on another device.
• There is no point in transferring system certificates - they are already built into the firmware.
• Certificates with private keys (.p12) are tied to the device if hardware key storage was used (for example, Android Keystore). In this case, transfer is not possible.