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Hacking the HDO1k/HDO4k Rigol 12 bit scope

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Veteran68:

--- Quote from: voltsandjolts on December 31, 2023, 09:45:42 am --- :-+


--- Quote from: ebastler on December 30, 2023, 10:12:49 pm ---Is the difference linked to the hardware versions 2 vs. 3?  voltasandjolts, what hardware version does your scope have?

--- End quote ---

v2

--- End quote ---

Very odd then. So the key difference of 148 bytes vs 388 bytes is not tied to hardware version 2 vs 3, nor apparently to a difference in FW or Android build. I assume then that the header contains an indicator to the app what size the key is. I wonder if it's a regional thing, maybe a different crypto algorithm is used in different parts of the world?

Let's see (assuming everyone's country is set correctly):

ebastler: Germany, HW3, 388 byte key
voltsandjolts:  UK, HW2, 388 byte key
bosav: Netherlands, HW2, 148 byte key
me:  US, HW2, 148 byte key

Nope, not seeing an obvious pattern there in terms of NA vs Europe or EU vs non-EU.

ebastler:
Yes, it's strange indeed. I searched for other references to hardware version 3, and thm_w is the only other owner of a v3 I came across here. All other DHO1074 models reported were v2, while the DHO1072 identifies as v9.

Hardware-wise, TurboTom's scope (with a similar calibration date) comes from a time where Rigol had to heavily improvise with litte patch/piggyback boards, presumably due to component shortages. Maybe there was an incompatible substitution which resulted in a small batch of "version 3" units? My scope is of the same vintage as others seen in the Black Friday sale, with a January 2023 calibration date. I'll wait a bit longer, until my Amazon return window expires end of January, until I open it up for a curious look inside.

Regarding the different key.data sizes -- no idea what's behind that. It seems that the key length is neither related to the firmware history nor the hardware version. So what could it be? And even more obscure, why was the key.data file missing entirely on my unit?

sizziff:

--- Quote from: ebastler on December 31, 2023, 05:26:26 pm ---.... while the DHO1072 identifies as v9.


--- End quote ---

my 1072 has a hardware version 1

TurboTom:
Happy New Year everyone!  ;D

And let me add mine to the "key length collection": DHO1074 HW2, bought at the BF sales from Amazon Germany (Rigol Europe), Key length 148 byte, Cal certificate date Jan 13, 2023

mm1:
DHO1104  Cal date 2022/10/16   Key Data 148 bytes Purchased NA.

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