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#1 2019-06-21 21:41:38

Charlie
Contributor
Registered: 2017-01-27
Posts: 90

Changing UID ATQA and SAK

Hi,

Im trying to change the SAK AND ATQA value on a 1K card to pretend to be a 4k Card. When I try it  change the UID it doesnt seem to work.



pm3 --> hf sea u

 UID : 9D 21 95 A9
ATQA : 00 02
 SAK : 88 [2]
TYPE : Infineon MIFARE CLASSIC 1K
proprietary non iso14443-4 card found, RATS not supported
Answers to magic commands (GEN 1a): YES
Prng detection: WEAK
Valid ISO14443-A Tag Found
pm3 --> hf mf csetuid 9D2195A9 0002 18
--wipe card:NO  uid:9D 21 95 A9
old block 0:  9D 21 95 A9 80 98 02 00 E3 32 00 20 00 00 00 17
new block 0:  9D 21 95 A9 80 18 02 00 E3 32 00 20 00 00 00 17
old UID:00 00 00 00
new UID:9D 21 95 A9
pm3 --> hf sea u

 UID : 9D 21 95 A9
ATQA : 00 02
 SAK : 08 [2]
TYPE : NXP MIFARE CLASSIC 1k | Plus 2k SL1 | 1k Ev1
proprietary non iso14443-4 card found, RATS not supported
Answers to magic commands (GEN 1a): YES
Prng detection: WEAK
Valid ISO14443-A Tag Found


Any help or a point in the right direction would be great.

Thanks

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#2 2019-06-21 21:55:01

3dmann
Contributor
From: BRD- Deutschland
Registered: 2019-05-18
Posts: 39

Re: Changing UID ATQA and SAK

that's the mistake so it was at least with me

SAK : 88 [2]

SAK : 08 [2]

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#3 2019-06-26 17:41:53

Charlie
Contributor
Registered: 2017-01-27
Posts: 90

Re: Changing UID ATQA and SAK

Hi,

thanks for your reply, were you able to change the SAK value?

I was trying to set the SAK value as "18"and it wont allow me

pm3 --> hf mf csetuid 9D2195A9 0002 18

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#4 2019-06-26 18:46:39

3dmann
Contributor
From: BRD- Deutschland
Registered: 2019-05-18
Posts: 39

Re: Changing UID ATQA and SAK

SAK worth 18 ??? is there any value? 18
I only have sak 08 so far
example hf mf csetuid 39BFDA7B 0004 08

Last edited by 3dmann (2019-06-26 18:47:16)

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#5 2019-06-26 22:16:49

Charlie
Contributor
Registered: 2017-01-27
Posts: 90

Re: Changing UID ATQA and SAK

Watch Icemans Video: https://youtu.be/idtBV9wr0Eo?t=331

Last edited by Charlie (2019-06-26 22:17:31)

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#6 2019-06-26 22:44:01

3dmann
Contributor
From: BRD- Deutschland
Registered: 2019-05-18
Posts: 39

Re: Changing UID ATQA and SAK

NXP MIFARE CLASSIC 1k
not
NXP MIFARE CLASSIC 4k SAK 18 i video clip

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#7 2019-06-27 05:08:22

Charlie
Contributor
Registered: 2017-01-27
Posts: 90

Re: Changing UID ATQA and SAK

3dmann wrote:

NXP MIFARE CLASSIC 1k
not
NXP MIFARE CLASSIC 4k SAK 18 i video clip

The idea is that you can get a 1k card to appear to be a 4k card by changing the SAK

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#8 2019-06-27 05:09:59

iceman
Administrator
Registered: 2013-04-25
Posts: 5,613
Website

Re: Changing UID ATQA and SAK

it could be the uid card you are using,  the gen1a ones has many different ones,  not all allow for setting of SAK,  and some even limits what you can write and some allow full change.


If you feel the love,  https://www.patreon.com/iceman1001

modhex(hkhehghthbhudcfcdchkigiehgduiehg)

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#9 2019-07-16 20:28:58

hfmfsniff
Contributor
Registered: 2019-07-07
Posts: 18

Re: Changing UID ATQA and SAK

I bought 33 tags/cards from multiple vendors on Taobao/AliExpress and tested them one by one.
Most of them simply reply SAK=08  even if you changed SAK bytes.

Only 4 exceptions (2CUIDs, 2UIDs) implement real SAK change. Therefore, I immediately placed a larger order to build a reserve of this type of "precious" fully changeable tags.

They are on the way, I haven't tested them and remain pessimistically optimistic, since sources of these chips are mixed and unstable.

Willing to trade with anyone who need UID or CUID with such changeable SAK.

I am also willing to exchange these tags for any versions of secondhand Chameleon.

Last edited by hfmfsniff (2019-07-17 19:00:29)

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#10 2019-07-17 06:06:50

Charlie
Contributor
Registered: 2017-01-27
Posts: 90

Re: Changing UID ATQA and SAK

hfmfsniff wrote:

I bought 33 tags/cards from multiple vendors on Taobao/AliExpress and test them one by one.
Most of them simple reply SAK=08 change even if you set SAK bytes.

Only 4 exceptions (2CUIDs, 2UIDs) allow this. I immediately placed a larger order to build a reserve of this type of "precious" tags. They are on the way, but I am not sure they will allow SAK change since sources of these chips are mixed and unstable.

Willing to trade with anyone who need UID or CUID with such changeable SAK.


How do i contact you?

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#11 2019-07-17 09:52:08

hfmfsniff
Contributor
Registered: 2019-07-07
Posts: 18

Re: Changing UID ATQA and SAK

Charlie wrote:
hfmfsniff wrote:

I bought 33 tags/cards from multiple vendors on Taobao/AliExpress and test them one by one.
Most of them simple reply SAK=08 change even if you set SAK bytes.

Only 4 exceptions (2CUIDs, 2UIDs) allow this. I immediately placed a larger order to build a reserve of this type of "precious" tags. They are on the way, but I am not sure they will allow SAK change since sources of these chips are mixed and unstable.

Willing to trade with anyone who need UID or CUID with such changeable SAK.


How do i contact you?

hugearc  at  gmail

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