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As the title says, I'd like to know how to lock and/or unlock the writable pages (4 onwards) on the Mifare Ultralight C tag.

I've been able to read/write data on the tag, but now I need to lock the pages so that only my app will be able to read the data.

Is this possible? TIA

GonnaGetGet
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  • Possible duplicate of [Mifare Ultralight C Lock](http://stackoverflow.com/questions/26407591/mifare-ultralight-c-lock) – Michael Roland Apr 05 '16 at 07:15
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    @MichaelRoland thank you for your response. I've actually seen that post. Your answer shows how to lock specific pages, but I couldn't tell if those locked pages would still be accessible (to be able to write on them again) – GonnaGetGet Apr 05 '16 at 07:22
  • Also, how would I go about the actual 'authentication' process? Thanks! – GonnaGetGet Apr 05 '16 at 07:23
  • No, locking is permanent, but the second part of that post explains how to setup authentication for unlocked pages. – Michael Roland Apr 05 '16 at 07:24
  • The authentication mechanism is described in http://www.nxp.com/documents/data_sheet/MF0ICU2.pdf – Michael Roland Apr 05 '16 at 07:32
  • @MichaelRoland Thank you!! Reading the pdf file, I think I'm beginning to understand the second part of your answer on the other post. Quick question though, you said write AUTH0 as "0x29 0x00 0x00 0x00" - why "0x29" (41)? Why not require authentication for all the writable pages? Thanks again! – GonnaGetGet Apr 05 '16 at 07:59
  • Because that's what that question asked for. – Michael Roland Apr 05 '16 at 08:59
  • @MichaelRoland thank you for your help! I'd like to take the opportunity to ask - is there also an authentication process for the Ultralight (not the C)? Thank you! – GonnaGetGet Apr 06 '16 at 05:18
  • No, Ultraight does not have any additional security besides lock bits. – Michael Roland Apr 06 '16 at 06:25

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