PNG ICO ICNS MORE
Network & communications
Pixel
16x16 Free Application Icons
Lock, security, pwd
Black
16x16
Computer & hardware
Smooth
Crystal Project
show, hidden, stock
PNG MORE
stock, show, Controls
24x24
Desktop apps
3D
Free Applications Icons
Lock, clef, private
Log in, private, password
Key, private, login
UI
Gnome icons
hidden, show, Controls