Products > Test Equipment
Sniffing the Rigol's internal I2C bus
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NikWing:
ahh darn ... I dun have linux or a USB jtag lol

btw: if not ferrites, are these 0603 resistors?
step by step, they won't print values on resistors anymore to reduce costs
could be the reason, doesn't have to be the reason xD
elecBlu:

--- Quote from: Carrington on January 13, 2014, 05:39:44 pm ---LOL...  :-DD

--- End quote ---

nothing special about this, there are some unmarked resistor series out there. i doubt they choose this resistors because of the missing value on it, it should be a tolerance/price/availability thing.
tirulerbach:
JTAG DS2000A
anson80:
I just joined the forums,My English is not good.
 I have a newly purchased DS2102A.Its system info on the picture
 I would like to help and I'm ready to open my oscilloscope to JTAG this dump, but I'm not very familiar with in windows system JTAG,Can some guidance?
zombie28:
I found function responsible for loading and decrypting keys from flash, so I can confirm that the keys are not generated by the firmware itself (this wouldn't make any sense in case of public key anyway). I have also analyzed a few memory dumps from scopes of the same model (DS2072A), manufactured in consecutive weeks of 2013, and all of them had different key sets. So the keys are changed at least once a week.

Update: Rigol doesn't need to maintain database of all keys, because they can be generated algorithmically from scope's serial number, including ECC private key. However it is practically impossible to find out what algorithm it is, having only the keys.
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