access
analog
bank
chrome
code
coding
combination
concept
confidential
design
device
entry
equipment
glossy
guard
hack
illustration
key
lock
mechanic
mechanical
metal
metallic
mystery
number
object
open
padlock
password
protect
protection
realistic
safe
safeguard
safety
secrecy
secret
secure
secured
security
set
shiny
stainless
steel
storage
system
unlock
variation
vault