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Photography & graphic design
3D
32x32 Free Design Icons
Lock, palette, Color
Black
32x32
locked, Key, secure
Transparency, Lock
Gaming & gambling
Photorealistic
48x48 Free Object Icons
locked, Hide, login
48x48
security, privacy, Restriction
private, Protection, security
Unlock, Safe, secure
Protection, Close, Safe
Khaki
security, Lock, secure
Unlock, Key, locked
PNG MORE
Business & finance
Pixel
24x24 Free Pixel Icons
open, Lock
24x24
Lock
Glyph
24x24 Free Application Icons
Network & communications
16x16 Free Application Icons
secure, Log in, pass
16x16
Key, Log in, login
SandyBrown
Lock, security, pwd
Mixed
Flat
20 Flat Icons
Gainsboro
102x128
Gentle Edges Icon Set
Lock, secure
128x128
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Pittogrammi
locked, Lock
512x512
Unlock, Lock
Outline
iOS 7 icons
UI
Smooth
Snipicons
