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Skymedi 6221 Xor key?

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techchimp

Post subject: Skymedi 6221 Xor key?

Posted: Yesterday, 17:24

Joined: July 20th, 2026, 18:52
Posts: 4
Location: Uinted States

Hello everyone,

I'm hoping someone has a key for me to try to descramble a Hynix NAND dump. The chip is from an old SD card (Kingston 1gb).
I was recently archiving off all of my storage devices and this was the only card that failed.

I can carve jpg data from the dump, but it isn't correct.

This is mostly for curiosity (and education). I'm not using any recovery software, just writing my own python scripts.

Any assistance is greatly appreciated.

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fzabkar

Post subject: Re: Skymedi 6221 Xor key?

Posted: Yesterday, 20:41

Joined: September 8th, 2009, 18:21
Posts: 17070
Location: Australia

techchimp wrote:

I'm hoping someone has a key for me to try to descramble a Hynix NAND dump.

I can carve jpg data from the dump, but it isn't correct.

If it's scrambled, how can you tell that you have a JPEG? :-?

_________________
A backup a day keeps DR away.

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arvika

Post subject: Re: Skymedi 6221 Xor key?

Posted: Today, 0:26

Joined: October 24th, 2009, 15:22
Posts: 922
Location: Poland

SK6221 or SK6621? First one usualy it is used at pendrives, second at SD cards and it not use XOR.

_________________
Flash Killer - everyday new resources (pinout, XOR, ECC,config) for flash devices

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techchimp

Post subject: Re: Skymedi 6221 Xor key?

Posted: Today, 11:20

Joined: July 20th, 2026, 18:52
Posts: 4
Location: Uinted States

fzabkar wrote:

techchimp wrote:

I'm hoping someone has a key for me to try to descramble a Hynix NAND dump.

I can carve jpg data from the dump, but it isn't correct.

If it's scrambled, how can you tell that you have a JPEG? :-?

I'm getting jpg signatures. But they can't be decoded in any viewer.

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techchimp

Post subject: Re: Skymedi 6221 Xor key?

Posted: Today, 11:24

Joined: July 20th, 2026, 18:52
Posts: 4
Location: Uinted States

arvika wrote:

SK6221 or SK6621? First one usualy it is used at pendrives, second at SD cards and it not use XOR.

Sorry, it's SK6621 AARC A0727

If that's true, then I'll keep trying to get a logical block image.

Thank you

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arvika

Post subject: Re: Skymedi 6221 Xor key?

Posted: Today, 11:29

Joined: October 24th, 2009, 15:22
Posts: 922
Location: Poland

This controller usualy use block pair. Of course you need also think about ECC correction.

_________________
Flash Killer - everyday new resources (pinout, XOR, ECC,config) for flash devices

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fzabkar

Post subject: Re: Skymedi 6221 Xor key?

Posted: Today, 16:53

Joined: September 8th, 2009, 18:21
Posts: 17070
Location: Australia

@techchimp, can you dump the spare areas and upload them? I would be interested in examining the structure. I think you would need this info in order to build a translator.

_________________
A backup a day keeps DR away.

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techchimp

Post subject: Re: Skymedi 6221 Xor key?

Posted: 29 minutes ago

Joined: July 20th, 2026, 18:52
Posts: 4
Location: Uinted States

fzabkar wrote:

@techchimp, can you dump the spare areas and upload them? I would be interested in examining the structure. I think you would need this info in order to build a translator.

I can when I get home.

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