英文關鍵字
authorized
classified
animation
binary
type
typography
encrypted
password
scrambled
protected
bits
bytes
banners
classification
spy
hacker
design
secret
mission
communication
confidential
military
secured
crime
records
files
case
investigation
intelligence
mystery
security
secretive
clearance
paper
information
secrecy
fbi
agency
mi5
agent
hidden
file
restricted
nobody