"NNCP (Node to Node copy) is a collection of utilities simplifying
secure store-and-forward files and mail exchanging.
This utilities are intended to help build up small size (dozens of
nodes) ad-hoc friend-to-friend (F2F) statically routed
darknet networks for
fire-and-forget secure reliable files, file requests and Internet mail
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.
Out-of-box offline sneakernet/floppynet, dead drops and air-gapped computers support. But online TCP daemon with full-duplex
resumable data transmission exists.
NNCP is copylefted
free software
licenced under GPLv3+.
It should work on all POSIX-compatible systems. Easy integration with existing
SMTP servers. Single
YAML configuration file.
Why create yet another store-and-forward solution when UUCP, FTN and
even SMTP exists? Look in comparison section!
Simplicity, cryptographic security, sneakernet compatibility and easy
integration with current SMTP servers are the reasons."
http://www.nncpgo.org/
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