PNG ICO ICNS SVG MORE
Signs & symbols
Glyph
Alchemy
minimal, Alchemy, protect
Black
512x512
PNG SVG MORE
Miscellany Web icons
padlock, security, protect
371x512
Mixed
Basic icon element
security, Lock, protect
iOS7 optimized
Miu
locked, protect, security
security, secure, protect
UI
Very Basic. Android L (Lollipop)
private, Lock, protect
secure, protect, Key