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Generally speaking, you should not disable any credential unless there's news that a CA has become untrustworthy. You can disable security certificates listed in the user tab without any concern, as the apps installing these certificates will prompt you to install them again.

Creating the Device Certificate (Certificate Issued by a Certificate Authority)Open a Web browser.Click Login.Click Configuration, and then click Device Certificate under "Security" .Check the radio button next to the number of the certificate you want to request.Click Request.Make the necessary settings.More items...

How to Clear all Certifications for Android. If you wish to remove all certifications on your device, you can, in a few steps. You would usually remove a certificate if you no longer trust a source. Removing all credentials will delete both the certificate you installed and those added by your device.

You can also install, remove, or disable trusted certificates from the Encryption & credentials page.

Install a certificateOpen your phone's Settings app.Tap Security. Encryption and credentials.Under 'Credential storage', tap Install a certificate. Wi-Fi certificate.At the top left, tap Menu .Under 'Open from', tap where you saved the certificate.Tap the file.Enter a name for the certificate.Tap OK.

It means that someone installed a public certificate that your phone will trust for all secure (mostly Web) operations like you entering your banking password. Whoever holds the corresponding private certificate can create on-the-fly fake certificates for any domain on the Internet.

Accidentally deleting certificates will result in having to re-enter your credentials for the wireless network or authentication service. Information in this article applies to Mac OS X 10.8 Mountain Lion. It may vary slightly or significantly with other versions or products.

A certificate authority (CA) is a trusted organization that issues digital certificates for websites and other entities.

Trusted secure certificates are used when connecting to secure resources from the Android operating system. These certificates are encrypted on the device and may be used for Virtual Private Networks, Wi-Fi and ad-hoc networks, Exchange servers, or other applications found in the device.

You would usually remove a certificate if you no longer trust a source. Removing all credentials will delete both the certificate you installed and those added by your device.