Android certificate store

Android certificate store

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Android, like other platforms such as Windows and macOS, has a system root store that is used to determine if a certificate issued by a specific Certificate Authority (CA) is trusted. For compatibility, testing, and device security, you may want to know which certificates are trusted on Android.
Each root certificate is kept in its own file. Each file holds the certificate in PEM format, which is one of the most popular formats for TLS/SSL certificates and is book-ended by two tags, —–BEGIN CERTIFICATE—– and —–END CERTIFICATE—–, and encoded in base64. The certificate comes in X.509 format as well.
Note that manufacturers may choose to change the root store that ships with their devices, so you can’t ensure that these are the roots that are available on every current Android device. If you need to test compatibility with a particular device and have reason to think it may vary from the stock list, you should do so directly on that device. The steps below will show you how to get the trusted root list for a specific Android device.

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Although certificate deployment to Android devices cannot be automated, there are a few manual methods that are relatively simple. To install certificates from an SD card, follow these steps.
Go to Settings > Security > Credential Storage on your Android device’s SD card, and then tap Install from device storage.
The Certificate Installer searches for certificates to install in the download folder on the SD card. The extension.pfx or.p12 (PKCS #12 format) can be used for certificate files. The security certificate is removed from your SD card once it is added.

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Go to “Settings,” select “Screen Lock and Security,” and then “User credentials” to see what electronic certificates are installed on your Android 7 device.

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The list of installed certificates is displayed, but the certificate’s details (NIF, surname and name, etc.) are not displayed; instead, the name assigned to the certificate when it was installed is displayed.
If you can’t find it this way, look in “Settings,” “Screen lock and security,” “Other security settings,” “User certificate” on some devices.
In this case, the certificate’s NIF and surname/name are shown.
The list of installed electronic certificates is not visible on Android mobile devices running version 6 or earlier.
You’ll need to run a process that requires a certificate to see what user certificates are installed.
Close the browser and start a new one, then go to the Tax Agency website and click on any link that requires a certificate.
The certificate shop will open up with a list of the certificates installed on the device when you do this.

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The organizations you trust to ensure the signatures of your encrypted traffic and content are known as Certificate Authorities (CAs). That’s a lot of authority, and messing with the list of trusted officials is risky. Nonetheless, it’s something that advanced users may want to set up for Android testing, app debugging, reverse engineering, or as part of some enterprise network setups.
For a long time, Android has limited this authority, but with Android 11 (released this week), it goes even further, making it impossible for any app, debugging tool, or user action to prompt for the installation of a CA certificate, even in the untrusted-by-default user-managed certificate store. Any CA certificate must now be installed through a button hidden deep within the settings, on a page that apps cannot link to.
To be clear, it is critical to carefully manage the trusted CAs on Android devices! It should not be easy to add a CA by accident or unintentionally. It’s critical to protect users from themselves in this situation, and it’s a difficult problem to solve.

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