PNG SVG MORE
Signs & symbols
Glyph
Miscellany Web icons
Protection, security, Key
Black
434x512
padlock, security, protect
371x512
PNG ICO ICNS SVG MORE
Mixed
Simple files
Lock, secure, privacy
512x512
Electronics & appliances
Electronic Devices vol 2
repellent, Protection, refills
iconnice vector icon
security, Safe, Protection
445x512
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
UI
Very Basic. Android L (Lollipop)
secure, protect, Key