NNCP is a package facilitating secure store-and-forward file and mail
exchange. It can be thought of as a modern UUCP with Internet smarts.
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NNCP supports direct online communication over a LAN or Internet,
scheduled communication, offline copies, streaming communication
(pipes), and more. It can therefore be used for air-gapped computers
that might be communicated with by CD-ROM, tape, or USB stick. It can
also be used for intermittent or on-demand links, very slow or high
latency links, etc.
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NNCP can build up ad-hoc friend-to-friend (F2F) statically routed,
darknet, delay-tolerant networks for fire-and-forget secure reliable
files, file requests, Internet mail and commands transmission. All
packets are integrity checked, end-to-end encrypted, explicitly
authenticated by known participants public keys. Onion encryption is
applied to relayed packets. Each node acts both as a client and server, can
use push and poll behaviour model. Also there is multicasting areas support.
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Out-of-box offline sneakernet/floppynet, dead drops, sequential and append-only
CD-ROM/tape storages, air-gapped computers support. But online TCP daemon with
full-duplex resumable data transmission exists.
