bamboo curtain
barrier of secrecy
blackout
censorship
cover
curtain
disguise
hush-up
iron curtain
ironbound security
oath of secrecy
official secrecy
pall
repression
screen
seal of secrecy
security
smothering
stifling
suppression
veil
veil of secrecy
Japs
Lapps
apps
caps
chaps
claps
collapse
craps
elapse
flaps
gaps
lapps
laps
lapse
maps
naps
perhaps
raps
relapse
saps
schnapps
scraps
slaps
snaps
straps
taps
traps
yaps
zaps