Ham Radio

174 readers

1 users here now

This community is for anything related to ham/amateur radios

founded 3 years ago

MODERATORS

[email protected]

Encrypted Data Burst question (lemm.ee)

submitted 1 year ago by [email protected] to c/[email protected]

4 comments fedilink hide all child comments

Is there a portable civilian device that allows for short to medium range (10 miles or so) that would allow for 128 or 256 bit encrypted data bursts, and if so, what level certification would one need to go about for using it legally in the US? I’m imagining a data burst to convey less than 1 MB of data with an accompanying bit total that could then be “delivery confirmed” by a return message with that bit total. Bonus points if it could play nicely with a Disco32 Discus.

I know it wouldn’t fool a foxhunt, but was curious if such a thing exists and if so, what’s the entry cost in money and time?

all 6 comments

sorted by: hot top controversial new old

[–] [email protected] 1 points 10 months ago (1 children)

Rattlegram or similar with something like an RT10 (license free ism band 900mhz dmr with encryption) or Moto DTR (license free frequency hopping spread spectrum, tricky AF to intercept)

[–] [email protected] 2 points 10 months ago (1 children)

I’d love to hear more about the frequency hopping thing. What devices would I need, and how difficult is it to program?

[–] [email protected] 1 points 10 months ago

The Motorola DTR and DLR series radios are both compatible with each other. I've only gotten to tinker with DTR 600 and 700. They're not hard to program, and the software is free. Each "channel" is more like a time synchronized algorithm to calculate the next frequency. Iirc they change every 0.25ms within 902-928mhz, or 2.4ghz ism (hidden with wifi and Bluetooth) on the dtr 23x0 models. There are also other fhss radios that use their own incompatible hopping order like the trisquare exrs radios.