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codecreeper

CC Card Protector

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Was in Hardly Normals yesterday and noticed a slim credit card protector against scanning.

 

The little wallet style thing had like a wrapping of foil and LED's on the edge ,which got me curious as too how this works.

 

Guessing their must be a micro chip in that package somewhere.

 

So how does it work ?

 

 

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Wrapping your cc in tin foil from home has the same effect.

 

Got me really curious now.

 

So the CC must be the problem then does it emit some kind of signal then.

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So you need a signal to activate the chip then sends a signal back.

 

So you need something to block the signal.

 

Ok seen a cheap NFC blocker in one of these mailers ,just looks like aluminium wallet for $9.95 bit bulky though.

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Most modern phones have NFC as well so you have to be careful of people doing "phone scanning" your phone for working NFC.

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Most modern phones have NFC as well so you have to be careful of people doing "phone scanning" your phone for working NFC.

 

So they scan my phone too ,wow

 

Have to keep the porn off my phone then ,have not used my CC on my phone yet.

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It's pointless, your CC is already insured against unauthorized transactions. It's not your liability.

 

True but you what banks can be like ...

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I wouldn't quite say that, regardless of whether you get the money back or not it has potential to be real inconvenient.

 

I should think all you're doing is creating a Faraday Cage. I saw a pack of 2 yesterday @ Reject Shop for 3 bucks.

I also tend to think you'd probably do equally well just putting a piece of alfoil around your card.

 

I've seen the aluminium wallets advertised, it might be OK to own one just for the novelty value but how durable it'd be, NFI. I think my current leather wallet is near 10 years and still going well.

 

 

Also, have to add - the whole concept of putting RFID onto banking cards was poorly thought out and executed, so it's totally fair that the banks should be wearing the cost of the resultant fraud.

Edited by Rybags
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I am actually curious how those 'cards' work.

Originally i thought they were a signal blocker also, but now, I dont think so.

 

Main reason was actually an infomercial.

They put this 'other card' within a few mm's of the credit card, and even on the opposite side (not physically blocked by the blocker), it wouldnt NFC like it would prior to that.

 

Possibly another NFC chip thats like a bank card but totally fake? No idea.

 

But yes, if you have a wallet with a money sleeve that wraps around the outside of it when folded, just put a layer of alfoil in there and you'll stop them being able to do it at distance at least :)

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I have about 4 different NFC cards in my wallet, two visa paywaves and a pair of Go Cards, I figure that you'd never be able to get anything coherent from the bunch of them.

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But yes, if you have a wallet with a money sleeve that wraps around the outside of it when folded, just put a layer of alfoil in there and you'll stop them being able to do it at distance at least :)

 

Unless they tap your wallet in a crowd i suppose.

 

I always foil was a good conductor of signals ,could the signal hitting the foil not trigger a NFC on a card ?

 

Probably safer to put the cards in your shoes ,lol.

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/Installs NFC Tools on Nexus 7

 

To read the RFID on my card, needs to be fairly close proximity - about anywhere within the "nex" in the tablet name imprinted in the back.

 

A sliver of alfoil over the RFID tag seems sufficient to block access. Equally, placing the card on top of a piece of alfoil is also sufficient to block.

 

With my card as per normal in the wallet, can read it just fine from either side. Threshold of being able to access the card is about 1cm regardless.

A piece of alfoil in the adjoining compartment is sufficient to block access but such a method would easily fail if the alfoil crumpled such that it became smaller.

 

No doubt a more powerful reader might have more success.

 

IMO you're probably wasting your money on expensive wallets or protectors - an easy DIY measure would be to simply stickytape some alfoil to a business card or even a piece of paper that you remember to keep your card next to.

For me, I've got a laminator machine so might whip up something using that.

 

 

That said though, it puts the party trick of simply tapping your wallet against the POS reader into the no-go bin... has been my preferred method of shopping since about 3 days after I got this card.

 

Extra caution - you can use RFID tools to modify information on the chip so probably quite possible to trash that funcitonality on your card if you do the wrong thing with software + NFC device.

Edited by Rybags

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Might try and make a wallet with some old leather and put some catering alfoil which is about 5 times thicker than normal household alfoil.

 

Make a little card wallet that can fit in a wallet easily or inside a key chain wallet. Only problem the ends of card could be open. Or even a old cigarette case which is made of metal and can slide easily in your pocket.

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I would not go wreck the cc rfid chip, as magnetic strips on cc are pretty dodgy at times. I do use the tap n go as well

Edited by Jeruselem

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Bottom line, you don't need to go to great length or expense. Two pieces of alfoil either laminated or stuck to pieces of paper, either side of the RFID card/s.

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Eh... On the occasion that I'm out and about, I'm usually in a 'chair. Pockets are hard to use when sitting on them, so I have a "fanny pack"/"bum bag" for keys/wallet/phone and a whole lot of other shit (women: I now understand how your handbag get to weigh 100 pounds). Point is: It's really difficult to be unobtrusive about waving an NFC reader at about the height of a standing person's knees, let alone getting at me from the right facing, or making it past the arms I'm probably using to propel myself. :p

 

Also, I kinda feel anyone who does manage to pull that off deserves to feel good about their skills for that brief and shining moment they're ignorant of what they have: a debit card with no overdraw, and less than $100 in it. (The real account pays into a 'walking around" account - and that's the card that get carried.)

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I have about 4 different NFC cards in my wallet, two visa paywaves and a pair of Go Cards, I figure that you'd never be able to get anything coherent from the bunch of them.

 

Yeah when my Opal card is next to my mastercard neither will work.

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Update - I just went to the Woolworths with self-serve + the standard sort of EFT/reader that most places use.

Forgot I had the alfoil - so it wouldn't read the card if I presented the wallet with the alfoil facing the reader.

But unlike the Nexus, the reader had no trouble reading it with the card/chip facing the reader.

 

So, for best protection you'd want a double sided tin-foil hat for your card.

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Maybe get one of baseball collector cards plastic sleeves and trim it down to size then wrap some allfoil around it and then put in another collector card sleeve.

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Refer back to my laminator or sticky-tape + alfoil ideas... the thing is, you can give yourself equivalent protection without having to spend any money.

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sticky tape some alfoil so it wont rip, put it in the 'paper money' section of the wallet, and be happy that no one can "10 meter skim" you.

Honestly Code, I enjoy your ideas about the risks of new tech, because I used to think identically.

 

Something that helped me, was to consider the 'norm'. and simply be better than it.

 

So, most people can be 'briefcase skimmed' with a large scanner in a briefcase from 20+ meters away.

One simple layer of alfoil in the wallet fixed this.

 

Can he still read it if i TAP the wallet? yes.

Would I LET him? No.

And WHY would 'he' bother, when there's 5 billion others who arent careful and he can skim without effort.

 

long story short? There's plenty of suckers who take 1/5 levels of effort to defraud\skim\hack.

So long as I'm 2/5 effort, and dont have a SPECIFIC enemy targeting me, I'm instantly 'not worth the hastle'.

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Yep, I'm tending to think the single side protection would be enough. I keep my wallet in my pants pocket the same way always, clasp at top facing me so when I pull it out I can simply open it and everything's oriented right.

With the foil at back of the card it means the chip is facing to me and there's some RF protection on the outside.

 

The inconvenience becomes - you have a slot occupied by the foil though with a laminated piece there's no reason another card can't fit in there.

- and I have to orient the wallet the correct way for EFT readers to work with it, no great hassle.

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