Show HN: A new protocol for packet radio including ECDSA and compression

Post by madengr » Mon, Sep 24, 2018, 5:48 PM UTC

prolikewh0a wrote: post #16

brians wrote: post #13

Earlier quoted context omitted.

There are more hams in the US, and more active hams, than ever before. That's a funny sort of dying! Joe Taylor's work on below-the-noise signal extraction has revitalized shortwave: https://physics.princeton.edu/pulsar/k1jt/wsjtx.html , particularly at the nadir of the sunspot cycle. That's a funny sort of dying! Amateur satellites are accessible for $100 in parts: https://www.n2yo.com/satellites/?c=18 ; with the sa…

I've actually seen my young amateur radio communities die off during this new solar minimum, and a lot of my friends sold their expensive equipment. You really need money and space right now unless you want to sit at your desk and do some of the new low SNR "can talk to the mars rover with a wet sock as an antenna" modes that a lot of people don't like because it's too easy and poses no challenge. There's also VHF/UH…

Post by sneak » Mon, Sep 24, 2018, 5:58 PM UTC

M0 wrote: post #23

Cyph0n wrote: post #2

Cool project! I have always been interested in the amateur radio scene. So encrypting amateur radio comms is illegal in the US? Is there a particular reason for this?

This one is not encrypted. Its plaintext or compressed (gzip I think). Crypto is only for digital signatures.

Post by kawfey » Mon, Sep 24, 2018, 6:06 PM UTC

jimktrains2 wrote: post #12

rtkwe wrote: post #9

Earlier quoted context omitted.

The amateur public radio bands are supposed to be open and useful to everyone so the broadcasts in those spectra are supposed to be readable by everyone as part of the accessible part. On top of that encrypted transmissions would be basically noise pumped into the system making the open uses more difficult and harder to police.

> The amateur public radio bands are supposed to be open and useful to everyone so the broadcasts in those spectra are supposed to be readable by everyone as part of the accessible part. Except that proprietary voice codices are allowed :(

Post by Steltek » Mon, Sep 24, 2018, 6:22 PM UTC

moftz wrote: post #44

vvanders wrote: post #30

Does this do any sort of FEC? One of the things that makes stuff like this tricky(and APRS in general) is that one flipped bit throws off the whole decode. From what I've seen out there would be a 40% improvement[1] in just base APRS if there was some form of basic FEC built into the protocol. Sadly most of "state of the art" is stuck back in the 80s. [1] http://eludium.stensat.org/mcguire/projects/FX-25/FX-25_perf..…

AX.25 has no FEC but there is FX.25 which is an encapsulation of the AX.25 packet with a preamble at the front and reed soloman at the end. But the issue is the speed of AX.25, 1200baud is dreadfully slow to be adding much onto the packet. The FX.25 protocol is a neat idea that allows for old TNC hardware to still be on the air. However, TNCs can be built with the cheapest of the raspberry pi clones so there really i…

Post by bob1029 » Mon, Sep 24, 2018, 6:26 PM UTC

VMG wrote: post #11

rtkwe wrote: post #9

Earlier quoted context omitted.

The amateur public radio bands are supposed to be open and useful to everyone so the broadcasts in those spectra are supposed to be readable by everyone as part of the accessible part. On top of that encrypted transmissions would be basically noise pumped into the system making the open uses more difficult and harder to police.

what about steganography?