Honeywell International Inc. CT50L0N 用户手册

Android supports DER-encoded X.509 certificates saved in files with a 
.crt or .cer file extension. To install a valid certificate with a .der or it. 
Android also supports X.509 certificates saved in PKCS#12 key store 
files with a .p12 or .pfx entension. To install a valid key store file with 
another extension, you must change the extension to .p12 or .pfx to 
install it. When you install a certificate from a PKCS#12 key store, 
Android also installs any accompanying private key or certificate 
authority certificates.

To use a certificate, you must install it in the trusted credential storage on 
the computer.

1 Copy the certificate or key store from your PC to a microSD card.

2 Install the microSD card in the computer and turn the computer on.

3 Start the Settings app and tap Security > Install from SD card.

4 Tap the name of the certificate or key store to install it. If prompted, 

enter the key store password and tap OK.

5 Enter a name for the certificate and tap OK.

If a certificate is compromised, or your organization chooses not to trust 
it, you can disable or remove it.

1 Start the Settings app and tap Security > Trusted credentials. The 

trusted credentials screen has two tabs:

System shows CA certificates that are installed in the ROM.

User shows CA certificates you have installed yourself.

2 Tap the name of the certificate to disable or remove. The certificate 

details screen appears.

3 Scroll to the bottom of the details screen and tap Disable (for System 

certificates) or Remove (for User certificates).

If necessary, you can enable a disabled System certificate from this 
location. If you remove a User certificate, you must install it again to 
enable it.

4 Tap OK.

Note: Apps such as Email and Browser that support certificates allow 
you to install certificates directly from within the app. For more 
information, see the Help that comes with the app.