Dead drops are the simplest kind of network. A dead drop is a interaction where one person leaves data in a location for another person to pick up at a later time. A dead drop is often used for two persons to exchange information without learning the identity of another. This type of exchange predates computers and has been a tool of spycraft for centuries.
This is a example of a rudimentary local network. It is a simple exchange of information. In the case of a USB dead drop, like the ones mapped in deadrops.com, is is merely sequential connection to a single usb stick. The PirateBox software discussed in our software section is a example of a more sophisticated wireless dead drop.
A usb stick cemented into the wall is the cheapest community network. It can cost as little as 10 bucks for the stick and a little cement. However, it has serious downsides. It is difficult to access, can accommodate only asynchronous communication and can host no active applications.