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Signs & symbols
Glyph
Web UI
Safe, Circle, privacy
Black
512x512
Web UI color
green, Lock, secure
LightSeaGreen
Bold Purple (Free Samples)
security, Unlocked, Blocked
MediumOrchid
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Miscellany Web icons
Antivirus, shield, security
384x512
Protection, security, Key
434x512
padlock, security, protect
371x512
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Buttons
Error, Lock, Clear
Firebrick
security, protect, warning
Goldenrod
help, Protection, security
Teal
protect, shield, ok
OliveDrab
Mixed
Basic icon element
security, Lock, protect
Free Misc Icon Set 2
security, safety, on
iconnice vector icon
security, Safe, Protection
445x512
Network & communications
Cloud Computing
password protect, Key, Lock
DarkSlateGray
Amenities - Solid
payment, security, credit
Lock, security, secure
security, payment, Protection
iOS7 optimized
Miu
safety, stroke, Protection
private, Protection, safety
locked, protect, security
security, secure, protect
Social Messaging & Productivity Mix Icons
handrawn, files, documents
Avatars & smileys
Users. Android L (Lollipop)
secure, security, police
Unique-Round-Blue
Unlock, password, Safe
DeepSkyBlue