PNG ICO ICNS MORE
Gaming & gambling
3D
Free Game Icons
privacy, locked, Restriction
Black
64x64
Unlock, open, hack
secure, Authentication, password
Antivirus, locked, secure
login, secrecy, Golden
protect, secure, security
Avatars & smileys
Free Large Boss Icon Set
stupid, strong, power
512x512
shiled, stupid, strong
Business & finance
Free Large Business Icons
Safe, Foolproof, strongbox
strongbox, Foolproof, Sure
Photography & graphic design
32x32 Free Design Icons
locked, Key, secure
32x32
Key, password, login
Mixed
Iconza
secure, locked
Computer & hardware
FS Icons Ubuntu
realplaer, secure, Gnome
Network & communications
Hosting
login, private, Log in
128x128
Security
Secure icons
Unlock, private, secure
3D icons
Lock, private, padlock
256x256
Seven General Icons
Lock, password, secure
Luminight General Icons
Lock, secure
Desktop apps
Hornet
secure
BeOS
Discovery
realmedia, mime, realplaer
PNG MORE
Free Applications Icons
Lock, clef, private
24x24
Log in, private, password