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WP Woothemes Ultimate
Guard, shield, protect
Black
256x256
shield, protect, security
Narnia
protect, security, Guard
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DevCom Medical
care, Guard, shield
Medical
shield, protect, health
Legendora
protect, shield, security
Clean 3D
glossy, Guard, Blue
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Mixed
Flat
The shine of small things
protect, Key, privacy
512x512
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Signs & symbols
Glyph
Miscellany Web icons
padlock, security, protect
371x512
Electronics & appliances
Photorealistic
Tools and Devices
Lock, Encrypt, Key
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Education & science
Outline
Line mix Vol.2
secure, safety, shield
Filled outline
Line color mix Vol.2
secure, Protection, security
Music & multimedia
Line mix Vol.1
security, safety, protect
Mayssam
Account, Saving, save
Basic icon element
security, Lock, protect
Essentials
password, Lock, safety
377x512
iOS7 optimized
Miu
locked, protect, security
security, secure, protect
Handdrawn
Social Messaging & Productivity
shield, open lock, safety
protect, security, Lock
UI
Very Basic. Android L (Lollipop)
private, Lock, protect
secure, protect, Key
Gaming & gambling
3D
Free Game Icons
Antivirus, locked, secure
64x64
protect, secure, security