Nexus 7 Guidebook seCuRe YouR TAbLeT 76
charged or your tablet ’s not plugged in. if you change y our
mind about encrypt ing your tablet, to uch the back but ton.
WArnInG: if you i nterrupt the encr yption process, you
will lose data.
3. To uch Encrypt tablet.
4. e nter your lock scr een PiN or password a nd touch Continue.
5. To uch Encrypt tablet again.
The encryption pro cess starts and d isplays its progre ss. encryp -
tion can take an hour or more , during which tim e your tablet may
restart several times.
When encryption is c omplete, you’re prom pted to enter your PiN
or password.
subsequently, you must en ter your PiN or password each time
you power on your tablet, to de crypt it.
Work with certicates
You can use digital certicates to identify your devi ce for a variety
of purposes, includi ng VPN or Wi-Fi networ k access as well as
authentication to ser vers by apps such as email or b rowser. To
use a certi cate to identify your devic e, you must obta in it wi th
help from your system admi nistrator, and in stall it in your d evice’s
trusted credential sto rage .
Android suppor ts DER-en coded X.50 9 certi cates, saved in les
with a .crt or .cer  le extensi on. If yo ur certi cate le has a .de r
or other extension, you m ust change it to .cr t or .cer or you won’t
be able to install it.