access

accessibility

authentication

authority

authorization

authorized

burglar

business

card

closed

code

control

door

electronic

enter

entrance

entry

finger

guest

hand

holiday

hotel

identification

intruder

key

keycard

keycode

keyhole

lock

man

modern

office

open

plastic

precaution

privacy

protection

room

safeguard

safety

secure

security

sensor

service

standing

system

technology

unlock

vacation

validation