Samsung GT-P3113 用户手册

2. Touch Make passwords visible to enable or disable brief 

displays of password characters.
When enabled, a check mark 

 appears in the check 

box.

Device Administration

To add or remove device administrators:

1. From a Home screen, touch 

 Apps 

➔

 

 Settings 

➔ Security.

2. Touch Device administrators.

Enable or disable installation of applications from sites other 
than Google Play.

1. From a Home screen, touch 

 Apps 

➔

 

 Settings 

➔ Security.

2. Touch Unknown sources.

An informational pop-up displays.

3. Read the message and touch OK to allow installation of 

non-Google Play applications.
When enabled, a check mark 

 appears in the check 

box.

Warning! Enabling this option causes your tablet and personal 

data to be more vulnerable to attack by applications 
from unknown sources.

Credential Storage

Trusted Credentials
If a certificate authority (CA) certificate gets compromised or 
for some other reason you do not trust it, you can disable or 
remove it.

1. From a Home screen, touch 

 Apps 

➔

 

 Settings 

➔ Security.

2. Touch Trusted credentials.

The trusted credentials screen has two tabs:

• System: Displays CA certificates that are permanently 

installed in the ROM of your device.

• User: Displays any CA certificates that you installed, for 

example, in the process of installing a client certificate.

3. Touch a CA certificate to examine its details.

A scrolling screen displays the details.