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Please do not post questions about data recovery cases here (use this forum instead). This forum is for topics on finding new ways to recover data. Accessing firmware, writing programs, reading bits off the platter, recovering data from dust...



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einstein9
 Post subject: Re: WD MCU - No more...
PostPosted: Today, 5:44 
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Joined: May 13th, 2010, 11:17
Posts: 2826
Location: Kuwait
pepe wrote:
once you know how to do it, it should be simple like 1,2,3, write a little tool to extract and write back, this takes time but after that it is a few clicks... making such tool is a lot simpler than do this soldering every time... Moving the MCU is even more simple :roll:


Trust me am aware of this, but again not as easy as it looks. process requires preparation and manually extract it.
In addition I prefer the commercial ver. to make some $$$ out of this, the tool as you mentioned is not a good idea for commercial purpose but personal usage i Agree :wink:

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fzabkar
 Post subject: Re: WD MCU - No more...
PostPosted: Today, 8:27 
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Joined: September 8th, 2009, 18:21
Posts: 17147
Location: Australia
einstein9 wrote:
"MCU locked means if you write native ROM to donor usb pcb data would be encrypted such as new charger/SpyG2 for example" ---->>@fzabkar

The point of what i did is simply using Native MCU in donor PCB without moving it

Yes, I understand that. I just don't understand why you need to wire your patient to your donor.

You say you will be offering a commercial product. What will that entail?

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Doomer
 Post subject: Re: WD MCU - No more...
PostPosted: Today, 10:35 
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Joined: September 29th, 2005, 12:02
Posts: 3579
Location: Chicago
1. Sometimes PCB does not work, and moving MCU seems like an easier task than soldering tens of wires. This is maybe 5% of all recoveries.
2. Out of those cases when PCB is broken and after MCU is moved about 10% don't work, because the MCU itself has problems (the drive either clicks or does not come ready or similar). In these cases maybe this solution would work
3. What nobody mentioned here is that IF the keys can be extracted from the MCU, there is no need to write them to another MCU, data can be decrypted with software. So extracting keys seems like a move to the right direction.

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pepe
 Post subject: Re: WD MCU - No more...
PostPosted: Today, 10:50 
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Joined: October 3rd, 2005, 0:40
Posts: 4799
Location: Hungary
knowing the key is just the start, one needs to know other params of the encryption, like salt value, how these are used, which might be tricky in the case of a hw based encryption.
DEK is usually wrapped using some method using the KEK, which is usually some hash of user pwd. Pwd padding, hash count, hash algo, all these methods need perfect discovery. Of course ideally this is the way, but until all these are reversed, writing the MCU key to another mcu might be just as fine.
I was also into it in some extent, but yeah, lack of time...

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Doomer
 Post subject: Re: WD MCU - No more...
PostPosted: Today, 11:27 
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Joined: September 29th, 2005, 12:02
Posts: 3579
Location: Chicago
pepe wrote:
knowing the key is just the start, one needs to know other params of the encryption, like salt value, how these are used, which might be tricky in the case of a hw based encryption.
DEK is usually wrapped using some method using the KEK, which is usually some hash of user pwd. Pwd padding, hash count, hash algo, all these methods need perfect discovery. Of course ideally this is the way, but until all these are reversed, writing the MCU key to another mcu might be just as fine.
I was also into it in some extent, but yeah, lack of time...

I can do all that for Chargers, just need to know the MCU keys :)

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pepe
 Post subject: Re: WD MCU - No more...
PostPosted: Today, 11:32 
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Joined: October 3rd, 2005, 0:40
Posts: 4799
Location: Hungary
nice then :)

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fzabkar
 Post subject: Re: WD MCU - No more...
PostPosted: Today, 12:15 
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Joined: September 8th, 2009, 18:21
Posts: 17147
Location: Australia
What does this mean, and why does the commercial product need a "bridge"? Or is your interpretation of "bridge" something other than the USB-SATA bridge? Once you release the product, everyone will see how it is constructed, so I can't see the point of obfuscation.

einstein9 wrote:
3- My Research which is based on the Chinese PCBs which converts USB to SATA. we have to remove few caps and jump wire few pins from patient to donor pcb
process takes few min. and you are set & ready to go. (probably will be released next year as a commercial bridge pcb by our Team)"

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