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Mixed
Outline
bitsies!
secret, hidden, invisible
Black
512x512
UI
Freeline
login, secret, Lock
Computer & hardware
Line icons for UI & more
web design, safe privacy, ui
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Glyph
Octicons
secret, Gist
448x512
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Halloween
Photorealistic
Desktop Halloween
Cemetery, tomb, cross
256x256
bogey, phantasm, flight
Gaming & gambling
3D
Free Game Icons
secure, Authentication, password
64x64
login, secrecy, Golden
Network & communications
Pixel
16x16 Free Application Icons
secure, Log in, pass
16x16
Key, Log in, login
Lock, security, pwd
Avatars & smileys
Cartoon
POPO emotions: The Blacy
secret, smile
128x128
PNG MORE
Desktop apps
Free Applications Icons
Lock, clef, private
24x24
Log in, private, password
Key, private, login