this post was submitted on 07 Jun 2026
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    [–] ExtremeDullard@piefed.social 436 points 2 months ago* (last edited 2 months ago) (24 children)

    I'll do one better:

    Reshaped payment card's NFC antenna

    My payment card was just a bit too wide to fit in my cellphone's cover. The phone's own NFC antenna is at the top - and I use it all the time - so the card had to be at the bottom of the cover to avoid triggering the phone all the time, in portrait orientation so-to-speak.

    So I dissolved the card in acetone to extract the NFC chip and its antenna, then carefully reshaped one end of the antenna so it's a bit less wide (and since I couldn't modify the length of the wire or the number of turns in any way to avoid de-tuning the antenna too much, I sort of accordioned one side of the rectangle to accommodate the extra length of wire).

    Then I set the new shape of the antenna permanently by carefully applying a piece of packing tape over it, flipped it over, taped over the other side to seal everything, then carefully cut around the new, ultra-thin, stubbier contactless payment "card".

    Now it fits really smartly in my cellphone cover!

    [–] SpaceNoodle@lemmy.world 204 points 2 months ago (1 children)

    Next time someone calls me a maniac, I'll show them this.

    [–] WhoIzDisIz@lemmy.today 26 points 2 months ago

    Definitely doesn't live up to their username.

    [–] flamingos@feddit.uk 119 points 2 months ago

    The fact it's secured with a piece of sellotape is just *chef's kiss*.

    [–] napkin2020@sh.itjust.works 65 points 2 months ago

    You are fucking crazy. I love you.

    [–] felsiq@piefed.zip 49 points 2 months ago

    >ExtremeDullard
    >most interesting post

    ???

    [–] hoshikarakitaridia@lemmy.world 41 points 2 months ago

    Peak Lemmy behaviour I love it

    [–] 87Six@lemmy.zip 37 points 2 months ago

    I just wanted to say your dad is definitely proud of you dude

    [–] gedfromgont@piefed.ca 30 points 2 months ago

    You just had to 1-up everyone here...

    [–] Pyron@feddit.org 26 points 2 months ago

    "Please use chip reader".....

    [–] OwOarchist@pawb.social 26 points 2 months ago (4 children)

    I dissolved the card in acetone to extract the NFC chip and its antenna,

    Wouldn't the acetone also dissolve the insulation around the antenna wire? So when it touches itself, it shorts itself out, and -- electrically speaking -- you only have one turn of thicker wire?

    [–] Darkassassin07@lemmy.ca 54 points 2 months ago

    Wire that thin is usually insulated with an enamel coating. I'd guess it's either unaffected by acetone, or just tougher to breakdown. Allow the card to dissolve, but remove and dry asap, don't let it linger longer than necessary.

    Veritasium demoed this a few weeks ago while discussing tap-to-pay security and a vulnerability with apple pay+visa.

    [–] Korhaka@sopuli.xyz 19 points 2 months ago (1 children)

    Only one way to find out, good thing that these don't cost any money and you can just ask for a new one.

    Maybe take some cash out first to cover any payments you may need to make it it breaks in some way.

    [–] OwOarchist@pawb.social 7 points 2 months ago (2 children)

    If OP is using it and is happy with it, maybe one turn of wire is enough for it to still work, maybe with reduced range?

    [–] myotheraccount@lemmy.world 17 points 2 months ago

    My guess is it wouldn't work. On a magnetic antenna, the number of turns don't affect range, but they do affect the frequency to which the antenna is tuned. It needs to be tuned roughly to the frequency the protocol operates on, otherwise it won't work. In addition to that, these antennas also need to pick up power, which is also relative to the number of turns.

    [–] Korhaka@sopuli.xyz 7 points 2 months ago

    Seems like something to experiment with at some point. I do have access to test contactless card readers but not sure how they would feel about me destroying the test cards.

    [–] mexicancartel@lemmy.dbzer0.com 12 points 2 months ago* (last edited 2 months ago)

    Well if it dissolved any insulation, it will not work, as the coil isnt even coiling. It is not a one big coil buy just two ends shorted(or as in the picture, a very small coil. Since this works i can only conclude coating does not dissolve in acetone

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    [–] newton@feddit.online 15 points 2 months ago

    Ty, great idea will try it

    [–] definitemaybe@lemmy.ca 14 points 2 months ago* (last edited 2 months ago) (1 children)

    Have you ever run into difficulty with needing to authenticate with chip+PIN? Like while traveling?

    That would be my big concern with this; it would make it very difficult to pass a PIN check, to say the least!

    Super cool idea. I might just try it myself and see if I run into issues.

    [–] ExtremeDullard@piefed.social 23 points 2 months ago (2 children)

    What I modified was in fact a contactless payment token. It had the form factor of a payment card, but it only does NFC.

    I have another card for chip+pin.But I almost never use it where I live, because all limits were lifted on contactless payments a few years ago. If I try to pay something really expensive contactless, it will ask me for the pin - which is specific to the payment token.

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    [–] GreenShimada@lemmy.world 13 points 2 months ago

    I love this.

    [–] pankuleczkapl@lemmy.dbzer0.com 12 points 2 months ago

    Amazing, I have never thought of that! I have always carried my card behind the phone, which is a bit too thick for my liking, but this is such a great idea, thanks for sharing!

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    [–] artwork@lemmy.world 61 points 2 months ago* (last edited 2 months ago) (2 children)
    [–] flamingos@feddit.uk 38 points 2 months ago (1 children)
    [–] normis@infosec.pub 68 points 2 months ago (4 children)

    Screen side with call buttons

    [–] Darkassassin07@lemmy.ca 14 points 2 months ago (1 children)

    You could put the rubber bands in between the phone and the case, so it's not on top of the screen.

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    [–] flamingos@feddit.uk 10 points 2 months ago

    Ah, now I see it. Thanks!

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    [–] Hazel@piefed.blahaj.zone 7 points 2 months ago (7 children)

    Yeah just use glue, smh my head.

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    [–] NoSpotOfGround@lemmy.world 60 points 2 months ago* (last edited 2 months ago)

    Take that Android! This works even with the phone powered off! It works even without the phone at all!

    Wait...

    [–] stoy@lemmy.zip 56 points 2 months ago (3 children)

    Or you can just keep your card in your wallet, like you have done for decades

    [–] Phantaloons@piefed.zip 26 points 2 months ago

    The privileged have to invent their own problems.

    [–] JesusTheCarpenter@feddit.uk 19 points 2 months ago

    The problem is that I don't cary my wallet with me for pretty much a decade now.

    [–] makeshift0546@lemmy.today 9 points 2 months ago* (last edited 2 months ago) (5 children)

    Didn't have to carry a phone for decades.

    Now I don't have to carry a wallet and multiple cards πŸ€·β€β™‚οΈ

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    [–] diaphragmwp@discuss.tchncs.de 38 points 2 months ago (12 children)

    Ironic it's a monobank card, it's mobile only and you have to use a locked unrooted googled phone (or an iPhone) because big brother said so.

    [–] UkrainianBull@reddthat.com 34 points 2 months ago* (last edited 2 months ago) (2 children)

    Also this https://telegraf.ua/ukr/ukrayina/5935111-gorokhovskogo-chekae-pokarannya-yuristi-rozpovili-chim-dlya-monobank-zakinchitsya-skandal-z-oprilyudnennyam-foto-klientki

    TLDR: some woman did a facial recognition log in method, the bank said that the photos are not stored and deleted instantly, but because there was a Slovenian flag (looked like russian in the photo)in the background, she got her bank account blocked and the CEO posted the verification image online

    Edit: wrong link

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    [–] Zamboni_Driver@lemmy.ca 30 points 2 months ago (2 children)

    Now how about contactless payments without visa or MasterCard.

    [–] brucethemoose@lemmy.world 26 points 2 months ago* (last edited 2 months ago) (5 children)

    It would have been nice if crypto didn’t turn into a network of pyramid schemes.

    Like, I am sympathetic to the idea. I mined a Bitcoin a long time ago (and lost it in intervening years). But holy moly, did it erupt into a tire fire.

    [–] jonion@lemmy.world 8 points 2 months ago* (last edited 2 months ago)

    GNU+Linux is currently being used to kill civilians in several wars, but we don't feel the need to point that out every time somebody says they use Arch btw.

    Good tech can be used by bad people without everybody having to distance themselves from the tech itself.

    That's not to say that BTC is good tech, but it's a decent proof of concept to free digital transactions from monopolists and tyrants.

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    [–] PerogiBoi@lemmy.ca 14 points 2 months ago (5 children)

    Non American credit cards when

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    [–] UkrainianBull@reddthat.com 27 points 2 months ago (4 children)
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    [–] drmoose@lemmy.world 24 points 2 months ago (4 children)

    We can go even further and create some sort of physical tokens that we can give to each other. These token would be secure, completely private, waterproof and even work offline. Maybe we could even put some pictures on them and make them vision-impaired accessible - the possibilities are endless!

    People forget that cash is a technology - a pretty good one too.

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    [–] user224@lemmy.sdf.org 22 points 2 months ago* (last edited 2 months ago) (2 children)

    Maybe a solution similar to this could work: https://github.com/nfcgate/nfcgate/blob/v2/doc/mode/Relay.md

    Have the card at home sitting on a reader connected to your homelab, add NFC module to PinePhone and simply relay the traffic over network.

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    [–] nefRrgar@lemmy.world 21 points 2 months ago (1 children)

    Works without connection tooπŸ”₯

    [–] GutterRat42@lemmy.world 23 points 2 months ago

    Contactless payment works without connection. Now, the technical marvel is that it works even if the phone is dead.

    [–] mEEGal@lemmy.world 21 points 2 months ago

    Nice meme, but for us out there with at least a fully virtual card (some companies provide such benefits), we need a real MyAss-Pay alternative

    I recently found Walt, but it's a work in progress for now. The app is avalaible though

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