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UI
Pixel
Fugue Icons
plus, shield
DarkSlateGray
16x16
tick, shield, ok
Green
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Desktop apps
Smooth
Ginux
Protection, shield, security
DimGray
64x64
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3D
Free Applications Icons
Lock, clef, private
Black
24x24
Log in, private, password
Key, private, login
Protection, secured, private
Music & multimedia
Soft Icons
Check, Protection, Antivirus
DarkSeaGreen
128x128
Computer & hardware
Human o2
shield, Breach, security
DarkRed
shield, cross
Mixed
Basic Set
shield
CornflowerBlue
Iconza
shield, Antivirus
32x32
shield, Clamtk
Mini icons 2
Lavender
10x10
shield, Minus
question, shield
RoyalBlue
shield, exclamation
shield, Arrow
pencil, shield
Minus, shield
shield, plus
disable, shield
DarkGray