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Mixed
Handdrawn
Social Messaging & Productivity
Umbrella, secure, Safe
Black
512x512
UI
Outline
Watchify v1.0 - 80px
Lock, secure, Protected
Watchify v1.0 - 32px
Protection, Lock, secure
Avatars & smileys
Glyph
Users. Android L (Lollipop)
secure, security, police
Very Basic. Android L (Lollipop)
secure, protect, Key
Unique-Round-Blue
Unlock, password, Safe
DeepSkyBlue
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Material Core
Lock, https, secure
356x512
Closed, secure, Lock
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Mobile apps
app types in grey
Safe, security, secure
DarkSlateGray
Smooth
Angular UI
secure, Unlocked, Lock
DarkSlateBlue
Internet and web
Guard, safety, protect
Files & folders
3D
Sphere 1.4 icon theme
Folder, secure
LightGray
280x280
Flat
Stash
Protection, secure, shield
DimGray
Flat Green
password, protect, secure
Gainsboro
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Business & finance
Payment methods
secure, payment, Price
WhiteSmoke
128x128
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Education & science
Brainy Icons Free — 36 Science and Education Icons
Man, privacy, Avatar
64x64
Signs & symbols
Two Tone Design Set
Unlock, password, security
Chocolate
security, secure, password
WPZOOM Developer Icon Set
secure, Lock, Closed
Linecons Free – Vector Icons Pack
password, Lock, security
Lock, secure, password
Gaming & gambling
Free Game Icons
privacy, locked, Restriction
Unlock, open, hack
secure, Authentication, password