PNG ICO ICNS MORE
Mixed
Handdrawn
Web Design Creatives
shield
Black
128x128
UI
Pixel
Fugue Icons
shield, exclamation, frame
16x16
PNG MORE
Desktop apps
3D
Free Applications Icons
Lock, clef, private
24x24
Log in, private, password
Key, private, login
Protection, secured, private
Computer & hardware
Human o2
shield, Clamtk
Shopping & e-commerce
Smooth
Woothemes Ultimate Icon Set
web, shield
Glyph
Ecqlipse 2
security, shield
Futurosoft
Blue, help, shield
windows, Folder, shield
security, shield, win
32x32
Siena
green, shield, protect
256x256
shield, Blue, protect
red, shield, protect
yellow, protect, shield