Google Nexus 10, Manual Book

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NEXUS 10 GUIDEBOOK DEVICE SETTINGS 140
The encryption process starts and displays its progress. Encryp-
tion can take an hour or more, during which time your tablet may
restart several times.
When encryption is complete, you’re prompted to enter your PIN
or password.
Subsequently, you must enter your PIN or password each time
you power on your tablet, to decrypt it.
Work with certificates
You can use digital certificates to identify your device for a variety
of purposes, including VPN or Wi-Fi network access as well as
authentication to servers by apps such as Email or Chrome. To
use a certificate to identify your device, you must obtain it with
help from your system administrator, and install it in your device’s
trusted credential storage .
Android supports DER-encoded X.509 certificates, 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 saved in PKCS#12 key
store files with a .p12 or .pfx extension. If your key store has some
other extension, you much change it to .p12 or .pfx or you won’t
be able to install it. When you install a certificate from a PKCS#12