They are on the same spectrum of methods to remove the entropy of a message. Basic cryptography.
What compression techniques are we presently allowed to use over the air?
Cliff K6CLS CM87
On December 3, 2021 11:38:22 AM PST, "Tim Požar" pozar@lns.com wrote:
Please point to the reference that says compression is encryption.
Tim
On 12/3/21 11:10 AM, Cliff Sojourner via 44Net wrote:
Unfortunately, compression is considered a type of encryption so also a no no over the air. Apparently, even a common well-documented type such as ZIP.
We could run SSL with a NULL cipher over the air. Not much gain from that, though, because the HMAC is made to detect small number of bit errors, but not at the rates we likely see over the air. And it is detection only, no correction.
Cliff K6CLS CM87
On December 3, 2021 10:42:56 AM PST, "Tim Požar via 44Net" 44net@mailman.ampr.org wrote:
There have been two attempts to get the FCC to allow encryption in Part 97. RM-11699 in 2013 and RM-11831 in 2019. Both have been dismissed by the FCC. Please read these petitions and you will see that encryption is not allowed.
Tim
On 12/3/21 10:32 AM, Dave Gingrich via 44Net wrote:
That is referencing phone ops, transmitting music, and coded words to hide meaning. It certainly does not include encryption, using standards based tools, such as SSH or SSL. I was using those methods over the radio in the 1990s. IOW, that whole paragraph speaks to the purpose of the transmission, not the traffic it generates.
It will be near impossible to establish any type of network today, that does not carry traffic that is not encrypted in some fashion. If that is a requirement, we'd best just give up and shut off our radios.
— Dave K9DC
On Dec 3, 2021, at 12:50, Tim Požar pozar@lns.com wrote:
Please refer to § 97.113(a)(4) Prohibited transmissions...
(4) [...] messages encoded for the purpose of obscuring their meaning, except as otherwise provided herein [...]
Tim
On 12/3/21 9:45 AM, Dave Gingrich via 44Net wrote:
Please point out where the "the USA encryption restriction” over radio links, is documented. After all, D-Star radios use a proprietary codec. Heck even if you access https://ampr.org/ over a radio link, the connection is SSL encrypted, as are nearly all web sites in the world. Encryption over RF links has not been illegal for years, at least in .US. I can’t speak for other jurisdictions. — Dave K9DC > On Dec 3, 2021, at 11:23, air gapped via 44Net 44net@mailman.ampr.org wrote: > > Something to keep in mind: the USA encryption restriction only applies to traffic going over the air. > Networks can and do have encryption as long as relay over air has information in the clear. > > Adam Lewis > KC7GDY _________________________________________ 44Net mailing list 44Net@mailman.ampr.org https://mailman.ampr.org/mailman/listinfo/44net
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