PNG ICO ICNS SVG MORE
Mixed
Glyph
Basic icon element
security, Lock, protect
Black
512x512
iOS7 optimized
Miu
safety, stroke, Protection
private, Protection, safety
locked, protect, security
security, secure, protect
Social media
E-commerce
round, password, pass
password, pass, linecon
PNG ICO ICNS MORE
Network & communications
Iconico
Code, password, locked
1024x1024
Unique-Round-Blue
Unlock, password, Safe
DeepSkyBlue
Mobile apps
app types in grey
Safe, security, secure
DarkSlateGray
Business & finance
Gentle Edges Icon Set
Key, password
128x128
Flat UI Icons Free
Unlock, password, secure
Desktop apps
16x16 Free Toolbar Icons
password, Close, secrecy
16x16
Wireframe mono icons
black key, password, Lock
48x48