PNG ICO ICNS MORE
Desktop apps
Glyph
16x16 Free Toolbar Icons
password, Close, secrecy
Black
16x16
unsecured, Access, Broken
Network & communications
3D
Hosting
login, private, Log in
128x128
Security
Secure icons
Unlock, private, secure
512x512
Computer & hardware
Smooth
VistaICO Toolbar Icons
Compressed, secure, Zip
256x256
3D icons
Lock, private, padlock
Business & finance
Seven General Icons
Lock, password, secure
Luminight General Icons
Lock, secure
Hornet
secure
BeOS
PNG ICO MORE
Diagram
open, secure, Lock
64x64
Mac OS X style
Lock, secure, private
Discovery
realmedia, mime, realplaer
32x32
PNG MORE
Free Applications Icons
Lock, clef, private
24x24
Log in, private, password
Key, private, login
Protection, secured, private
Unlocked, password, Protection
Mixed
Pixel
Twotiny
Evelope, Lock, mail
DRF
security, safety, secure
UI
Nuvola
pass, Key, secure
Nuove
Crystal Clear
secure, password, Lock