LG Nexus 4, Руководство пользователя

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SECURITY SETTINGS 203
When encryption is complete, you’re prompt­
ed to enter your PIN or password.
Subsequently, you must enter your PIN or
password each time you power on your
phone, to decrypt it.
Work with certificates
You can use digital certificates to identify
your device for a variety of purposes, includ­
ing VPN or Wi­Fi network access as well as
authentication to servers by apps such as
Email or Chrome. To use a certificate to iden­
tify your device, you must obtain it with help
from your system administrator, and install it
in your device’s trusted credential storage .
Android supports DER­encoded X.509 cer­
tificates, saved in files with a .crt or .cer file
extension. If your certificate file has a .der or
other extension, you must change it to .crt or
.cer or you won’t be able to install it.
Android also supports X.509 certificates