the.com/dead drop
a mailbox with no address, no line of sight, and no witnesses.
means a hidden physical location used to pass information or items between people who never meet, avoiding the risk of being seen together.
from cold war tradecraft, formalized by spy agencies who realized the weakest link in espionage was two agents shaking hands in public.
signal systema chalk mark or bent nail confirms the drop is loaded
no meetinghandler and asset may never see each other's face
digital heirsteganography and darknet drops replace the hollow rock
timing matterspickup delay can mean the drop was compromised
for instance
aldrich ames drops — cia mole used chalk marks on mailboxes in washington dc, 1985-1994
anna chapman case — 2010 russian spy ring used wifi-based digital dead drops in new york