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* [EN] NNCP 6.1.0 release announcement
@ 2021-02-24  9:32 Sergey Matveev
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From: Sergey Matveev @ 2021-02-24  9:32 UTC (permalink / raw)
  To: nncp-devel

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I am pleased to announce NNCP 6.1.0 release availability!

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
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 (E2EE), 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, sequential and
append-only CD-ROM/tape storages, air-gapped computers support. But
online TCP daemon with full-duplex resumable data transmission exists.

------------------------ >8 ------------------------

The main improvements for that release are:

* Optimization: most commands do not keep opened file descriptors
  now.  Previously you can exceed maximal number of opened files if
  you have got many packets in the spool directory.
* Optimization: do not close file descriptor of the file we download
  online.  Previously each chunk lead to expensive open/close calls.
* Online downloaded files are saved with ".nock" (non-checksummed)
  suffix, waiting either for "nncp-check", or online daemons to
  perform integrity check.
* Optimization: files, that are not resumed, are checksummed
  immediately during the online download, skipping
  ".nock"-intermediate step.
* Ability to store encrypted packet’s header in ".hdr" file, close to
  the packet itself.  That can greatly increase performance of
  packets listing on filesystems with big block’s size.

------------------------ >8 ------------------------

NNCP's home page is:

Source code and its signature for that version can be found here: (1040 KiB)

SHA256 hash: 083A533F 7D021206 9AE07F9F D6CD22E3 C5BE09E8 30F2C9C4 97D97CF6 14E5413F
GPG key ID: 0x2B25868E75A1A953 NNCP releases <releases@nncpgo•org>
Fingerprint: 92C2 F0AE FE73 208E 46BF  F3DE 2B25 868E 75A1 A953

Please send questions regarding the use of NNCP, bug reports and patches
to mailing list:

Sergey Matveev (
OpenPGP: CF60 E89A 5923 1E76 E263  6422 AE1A 8109 E498 57EF

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2021-02-24  9:32 [EN] NNCP 6.1.0 release announcement Sergey Matveev