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Signs & symbols
Glyph
Bold Purple (Free Samples)
security, Unlocked, Blocked
MediumOrchid
512x512
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Network & communications
Iconico
Code, password, locked
Black
1024x1024
Computer & hardware
Ionicons
Unlocked
Business & finance
Gentle Edges Icon Set
secure, Unlocked
128x128
Devine Icons Part 2
Mixed
IcoMoon
32x32
Arrows
DefaultIcon ver 0.11
open, Unlocked, padlock
256x256
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UI
IconSweets
50x50
Wireframe mono icons
padlock, open, Unlocked
48x48
Ecqlipse 2
Lock, Unlocked