this post was submitted on 13 Aug 2023
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No Stupid Questions

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The company I work in switched to a new building, and we have those stupid doors with RFID cards on them. I'd be damned if I'm going walk with that I'm-working-in-hightech-company-card dangling of my belt. I wonder if there is a way for me to use my phone for credentials. I tried searching for it, and all I could find is ways for me to use the phone in order to copy the info from one card to another.

So is it somehow possible?

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[–] a_new_sad_me@lemmy.world 2 points 1 year ago* (last edited 1 year ago) (7 children)

I see that my phone should support encoding NFC tags. I'll order a cheep ring and see if it works. Thanks.

I'm still curious though, why cannot phones produce that signals on their own? Isn't this what they do with payment apps?

[–] Ashiette@lemmy.one 3 points 1 year ago* (last edited 1 year ago) (6 children)

NFC ≠ RFID

Payment apps are NFC

[–] a_new_sad_me@lemmy.world -3 points 1 year ago (5 children)

True... I confused the term, but this makes my question even more relevant. Since I have to put the card on the reader, I guess that it is an NFC card, rather than RFID. Which means that I should be able to duplicate the signal with my phone. I think.

[–] Ashiette@lemmy.one 0 points 1 year ago (1 children)

Then again, what protocol does it use ? MiFare Classic then yes easy to duplicate.

Other MiFares? It will be harder/impossible.

[–] a_new_sad_me@lemmy.world 1 points 1 year ago (1 children)

I scanned the card using an app "NFC tools" It sais that it is manufactured by NXP and the protocol is MiFares 1k. Guess this hould work.

[–] Ashiette@lemmy.one 1 points 1 year ago (1 children)

It's doable. Read thoroughly and you'll be good to go

[–] a_new_sad_me@lemmy.world 1 points 1 year ago (1 children)

Do you have a starting place? All I've found is instructions for copying NFC tags.

[–] Ashiette@lemmy.one 1 points 1 year ago

My phone with NFC died a year ago so... Take what I say with a pinch of salt.

If I remember correctly you can use NFC tools pro to emulate a NFC tag. It doesn't always work. I think it's in the write section then emulate.

There are however hardware limitations on emulation because of sector 0. Maybe try to copy your NFC card to a blank NFC tag (get it cheap on eBay) then if it succeeds go toward emulation.

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