[EN] NNCP 7.0.0 release announcement

Sergey Matveev
2021-06-30T12:32:11Z

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I am pleased to announce NNCP 7.0.0 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.

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The main improvements for that release are:

* Merkle Tree-based Hashing with BLAKE3 (MTH) is used instead of
BLAKE2b. Because of that, there are backward *incompatible*
changes of encrypted files (everything laying in the spool
directory) and ".meta" files of chunked transfer.

Current implementation is far from being optimal: it lacks
parallelizable calculations and has higher memory consumption:
nearly 512 KiB for each 1 GiB of file’s data. Future performance
and memory size optimizations should not lead to packet’s format
change. But it is still several times faster than BLAKE2b.

* Resumed online downloads, because of MTH, require reading only of
the preceding part of file, not the whole one as was before.

* "nncp-hash" utility appeared for calculating file’s MTH hash.

* BLAKE2 KDF and XOF functions are replaced with BLAKE3 in encrypted
packets. Lowering number of used primitives. Also, its encrypted
packet’s header is used as an associated data during encryption.

* MultiCast Discovery uses ff02::4e4e:4350 address instead of
ff02::1.

* "nncp-cfgenc" mistakenly asked passphrase three times during
encryption.

* "nncp-stat" reports about partly downloaded packets.

* Updated dependencies.

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NNCP's home page is: http://www.nncpgo.org/

Source code and its signature for that version can be found here:

http://www.nncpgo.org/download/nncp-7.0.0.tar.xz (1123 KiB)
http://www.nncpgo.org/download/nncp-7.0.0.tar.xz.sig

SHA256 hash: D4D28E9A CF40FE12 68BDE134 9CD36076 282395BE 70094EFB 0DB75CE8 C32EA664
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: http://lists.cypherpunks.ru/nncp_002ddevel.html