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iOS7 optimized
Glyph
Miu
private, Protection, safety
Black
512x512
locked, protect, security
UI
Outline
Freeline
login, secret, Lock
Mixed
Handdrawn
Social Messaging & Productivity
protect, security, Lock
Very Basic. Android L (Lollipop)
private, Lock, protect
secure, protect, Key
Social Media
video, share, social-network
Grid, gaming, private
Shopping & e-commerce
3D
Amazon AWS Stencils
Copy, Service, non
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Education & science
Brainy Icons Free — 36 Science and Education Icons
Man, privacy, Avatar
64x64
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Gaming & gambling
Free Game Icons
privacy, locked, Restriction
Antivirus, locked, secure
Photography & graphic design
32x32 Free Design Icons
Key, password, login
32x32
Photorealistic
48x48 Free Object Icons
locked, Hide, login
48x48
security, privacy, Restriction
private, Protection, security
Antivirus, Guard, Army
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
Music & multimedia
Smooth
Gakuseisean
Folder, private
256x256
Desktop apps
Farm-fresh
private