PNG ICO ICNS MORE
Desktop apps
Smooth
Key, password, Lock
OliveDrab
48x48
One bit
Unlock, Lock
DarkGray
Lock, Blue, secure
UI
User Interface Icons
Lock, File
LightSteelBlue
80x80
Folder, Lock
SandyBrown
Lock
Gold
Lock, user
Lavender
Computer & hardware
Crystal Project
LightSalmon
32x32
Futurosoft
Lock, register, login
Silver
128x128
Black
Network & communications
Oxygen
Log in, password, Lock
Tan
key hole, Lock, Encrypted
Gainsboro
Lock, Unlock, password
LightGray
Keys, password, Lock
PNG MORE
Signs & symbols
34aL volume 3.2 SE
password, Lock, secure
DodgerBlue
24x24
password, secure, login
Function icons
48, Lock
Lock, Unlock, open
WhiteSmoke
Shopping & e-commerce
Siena
green, Lock
256x256
Lock, red