How MIFARE Uses Cookies

[N0AGI]

Thanks - would you be so kind and point me to an example where this Transaction blocks are demonstrated. or a code snippet best practice? I assume we will want to wrap the Begin/Commit/Rollback within the try/catch blocks.

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[N0AGI]

A quick question pertaining to preventing "tear", chip brick-age (if that's even a word) and maintaining data integrity between writes and updates.

Is there a recommendation of setting up a "transaction block" prior to begin of writes / updates and then commit or cancel transactions.

I am working with DF-EV2 implanted chipset. I want to be super mindful of error handling and managing data integrity so that I don't end up w/ bricked implanted chipset.

thanks

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[N0AGI]

this is super helpful - thank you for the detailed input and guidance. I will review and try to implement these in my attempts this weekend.

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[N0AGI]

hi TapLinx team
apologies if I am sounding thick here. I looked at the above mentioned, "DESFire EV1 change key" but, still have a few newbie questions. I would much appreciate any guidance.

I am working with my DESFire EV2 (card and an implant) and hoping to build a few useful end-user use case applications for it.

1. Is it possible to change the default PICC master key. Not just the encryption type, but, the actual key ?
2. I am trying to create an application with a custom key with an encryption type for it. In looking at the above example, it looks like this is doable by simply creating a new app level key. Correct ?
3. How does one use individual application level folders? Is the notion of an "application" meant to be used as storage unit for files that are sandboxed within the confines of the application domain ? So, if I want to look at the contents of a file within an application, I would first AuthN against the Master PICC key and then another AuthN at application key level and then enumerate the files ?
4. Do you have any examples of end-user use cases of how DESFire EV2 is being used ? If there are ready made applications/tools, I would rather purchase them and use them rather than building on my own. Any suggestions here ?

Sorry if these questions are basic, but, I am fairly new to this space.

thanks

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[N0AGI]

thank you - I will take a look into this doc - seems like a good reference for beginners.

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[N0AGI]

any thoughts here ? Why does the app fail to stay put, but wants to close ? Thanks much

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[N0AGI]

interesting, thanks for the clarification on the usability of TapLinx SDK for non-Android, PC level interface with external NFC readers.

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[N0AGI]

I was checking the permissions assigned to the TapLinx SDK sample android app after it is run on the device. The attached are the screenshots of the permissions seen after running the app from android-studio.

do they seem right?

from the manifest in the example, I expected this list to include NFC, among other permissions. But, not seeing them.

any thoughts ? Thanks

here's the manifest from the sdk example:

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[N0AGI]

please try this link to the video - thank you

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[N0AGI]

I tried a few different routes to figure out why this simple android app with the bare-bones basic NXP TapLinx init routine fails. Please take a look at my short demo video of this failure. The TAPLinx SDK sample app has a similar failure issue. As noted, this is a Samsung Note5, NFC is enabled and NXP Tag Reader and Writer both work just fine and are able to read my card and the implanted DESFire EV2. The same issue occurs on my Samsung S10+ and other NFC apps work just fine.

I am eager to make progress, but, just can't seem to move ahead w/ resolving this issue.

Can someone share what might be missing and causing this to fail? Any input is much appreciated

thanks

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[N0AGI]

thanks for this snippet. As you might have seen in my other post, i am having a tough time getting the sdk sample app to stay open. Would you be so kind and point me to the source code for this snippet in a project format please. I am not sure what I am missing. More in that other thread. Do not want to hijack this thread.

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[N0AGI]

hi TapLinx team - any thoughts here. Much appreciated. Thanks

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[N0AGI]

The NXP Tag Info and Write - apps - booth of them work just fine.

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[N0AGI]

hi TapLinx Team
Yes, I would like to use the TapLinx SDK; however, I am not able to get to a place where I can find simple self-contained programs. I am a Java dev, but a C, C# and Python. I dont mind picking up Java and roll with it. Therefore, I am looking for simple examples of TapLinx SDK for working with DESFire EV2 8K and MIFARE Classic 1K chipset. Can you point me to a place where you publish these samples please. Thanks

Secondly, I have purchased a FEITIAN 502 CL reader for my W10. I have not been able to get any of your NXP sample apps to support this reader. All I get is, "Reader Not Supported". Any guidance here is appreciated.

thanks

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[N0AGI]

I think I found some good info here and links to a TapLinx SDK webinar

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