PNG ICO ICNS MORE
Gaming & gambling
Photorealistic
48x48 Free Object Icons
private, Protection, security
Black
48x48
Unlock, Safe, secure
security, Lock, secure
Unlock, Key, locked
Network & communications
Pixel
16x16 Free Application Icons
secure, Log in, pass
16x16
Key, Log in, login
Lock, security, pwd
Business & finance
Glyph
Gentle Edges Icon Set
Key, password
128x128
PNG ICO ICNS SVG MORE
Mixed
Flat UI Icons Free
Unlock, password, secure
512x512
Desktop apps
3D
Demo Professional Toolbar Icons
word, parole, Door
64x64
Smooth
Farm-fresh
password, Change
32x32
16x16 Free Toolbar Icons
password, Close, secrecy
PNG MORE
IconSweets 2
Key, Brush, password
40x40
Key, volume, speaker
PNG ICO MORE
UI
Gnome Web Icons
password, Gnome, 64
Wireframe mono icons
black key, password, Lock
Seven General Icons
Lock, password, secure
256x256
Mac OS X style
Access, password, car keys
Shopping & e-commerce
Diagram version 2
96x96
Signs & symbols
Must Have
Free Applications Icons
Lock, clef, private
24x24
Log in, private, password
Key, private, login
Protection, secured, private