“Translate pvbhglmv from Atbash” is displayed after puzzle 14 on Google’s Da Vinci Quest.
Atbash is simpe. Just write the alphabet out, then write it out a line below in reverse.
A=Z
B=Y
C=X
D=W
Get it?
In my case, the answer to this puzzle is “keystone”!
If you don’t feel like doing this, just use this link.