PNG ICO ICNS MORE
Network & communications
Pixel
16x16 Free Application Icons
secure, Log in, pass
Black
16x16
Key, Log in, login
Lock, security, pwd
UI
Fugue Icons
Text, field, hidden
Gainsboro
PNG MORE
Mixed
Mini icons 2
hidden, field
Lavender
10x10
Gnome icons
hidden, show, Controls
24x24
Led Icons
hidden, field, Text
WhiteSmoke