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28

As Phil stated, you can still use the card using its number (as you would do on-line). Also, some ATM machine won't accept the card if not able to read the magnetic strip. The best thing is to use a credit card: in that case you can block the payment and get a refund.


23

Yes, you can. On some places you can find a device called demagnetizer. Just run your card over it (or over a very strong magnet), and the magnetic track will be corrupted and you will only be able to use the chip part of the card.


18

Changing your e-mail and phone number is silly. Your phone number, unless unlisted, is a matter of public record and easily discoverable. Even if unlisted, it is still a publicly shared identifier that can be discovered with some investigating. Your e-mail address is also a public identifier and can be discovered with some effort. Having identifiers in ...


14

Embossed letters are still present on CC to allow to quickly carbon-copy (literally) the card on paper. That's in the (very) old days, but still allowed today, and it will count as PRESENTIAL. Magnetic strip is still there because half of the CC readers still work that way. ATM and TPV outside USA and UE are still missing the chip reader, and even inside ...


10

YES, but there is a big chance that an (internally chip-capable) ATM (depending on region) will reject the card! The most common 2 problems for an ATM (including chip-capable) to reject a card are: a dirty or scratched magstripe (as shown in spork's answer) an erased or mangled (=invalid) magstripe by exposure to magnets or EMP (they need to emit ...


7

Payment protocols have many variants. However, they mostly boil down to the three following: The card number is just a reference, to be printed on paper. The owner signs with a pen on the paper. The paper may be printed with several technologies, some of them quite primitive (credit cards are embossed so that their number can be copied to paper efficiently ...


7

Don't do this, it will not work in ATM machines in my experience. I've had to get a new debit card mailed in last month because there was a little scratch out of the magnetic strip, although I had not noticed and had used it for daily chip-only and wireless transactions. It wouldn't work in any (Dutch) ATM machine afterwards (I tried my own bank's and ...


6

If the attacker gained access to your PayPal account via your username and password, the best thing to do is change your email and bank passwords. I'm hoping that you did not use the same password for all of these accounts. If you did re-use your password for PayPal on other accounts (Amazon, Ebay, etc), I would highly recommend changing those passwords as ...


6

Is there anything I can do to prevent them from tarnishing my [...] E-mail address In short: no. In general, you can't prevent anyone from using your email address and sending email on your behalf. You can do a little something by using forwarders that adopt SPF. This means that to be able to send an email to me, pretending to be from you, someone ...


5

There's a number of potential methods you can use to differentiate bots from humans but none of them are likely 100% Obviously as you say rate limiting catches the really stupid bots who don't know to click at human speed. You could say one click per IP but that will artificially deflate your stats in the case of humans behind a proxy (becoming more common ...


4

It likely depends on what network is being used to process the card. If the network is EFTPOS-like, a PIN is typical. However, if the network is credit-like, a signature is typical (at least, before EMV existed). A lot of cards are dual-branded, and how they are processed can depend on the configuration of the merchant's terminal. It's not likely to be a ...


4

What I think you'll find is that if you're in a country with Chip+PIN deployed, if a merchant takes a signature instead (usually because their Chip+PIN system is down) then the fraud liability moves from the customer to the merchant. So if you have fraudulent transactions on your card where the merchant doesn't have the PIN you can just dispute them and the ...


3

Signing for a credit card transaction is still quite common in countries where they use the magnetic strip on the side rather than the embedded smart card chip (which uses a PIN code). Note that this is a choice of the credit card company. A pin is indeed more secure, but for usability reasons not enforced everywhere (in Europe it is quite common these ...


3

When they realize that a big proportion of your clickers aren't buying anything, anywhere... if they have access to this data. I guess they can have feedbacks from clients on where they obtain their sales, and if on your site they are really low, or non existent, they will surely compare it with the typical profile of the people visiting sites similar as ...


3

There are many ways to track a users location on a mobile device (I will go into how that works later). None of the tracking methods are particularly easy to spoof. It can be done but it is simply outside of the realm of the average user as it generally requires either a modified device (physically or programmatically) or external gear. Moreover, it is ...


2

You can't. The way the mail system is designed does not ensure that sender email addresses must be verified. The email system we used was originally designed for a closed environment where all the members of the network were known and trusted, security and verification of sender address was not a requirement. When the internet was created there was no ...


2

Please remember that SSN numbers are NOT random. They include data like where it was issued, and what year it was issued. This might not be hard data, but it can be used to infer data about the person it was issued to. http://www.ssa.gov/history/ssn/geocard.html http://www.stevemorse.org/ssn/ssn.html ...


1

Owen's answer above reminded me of something very low tech but simple and effective that I've tried. To get an idea of how badly bots are skewing my click stats, -- right next to my affiliate banner graphic -- I have a single-pixel, transparent gif that's also wrapped in an href tag. I think it's safe to assume that only bots would be clicking that invisible ...


1

I don't know about the magnetic strip. I guess you can. In my country almost all shops have chip-readers. And if the card doesn't work, report it broken and you get a new one. CSC / CVV But what about the card security code (CSC or CVV). With your credit card number, expiration date and CSC anyone can shop online. No need to steal a card! It's just a ...


1

If you live in an area where no ATM and other cash terminal needs the magnetic strip, you can use a strong magnet to scramble the magnet strip. I personally have done this using a recycled neodymium magnet out of a decommissioned hard drive. Note: never put your debit card in a microwave if you intend to use it afterwards.


1

This organisation should have a specific landing point for customers to receive/verify/modify their PIN code, which does not depend on departments, and department staff should be trained to not give this information just as they would not give other sensitive personal information. The reason is you can't ask departments to reason about the sensitivity of ...


1

For Ingress, Google's global wargame, a range of anti-spoofing measures are used. Google are keeping quiet about the full range, but two that have been demonstrated are: Speed limitation: 40mph maximum allowed in game Corroborating measures: cross referencing wifi SSID's received with their location database


1

All the giftcard buying companies (like cardpool) are located in California because In the state of California all retailers that offer giftcards must refund giftcards for cash value or issue a new giftcard at no cost (California Civil Code Section 1749.5(b)) there is a 24-48 hour wait period for gift card buying companies to pay you. So what they do is ...


1

What you need to do is learn the tricks of the trade. What likely happened was your card was read by a "Skimmer" and then re-programmed on another card. Many Credit Card Companies make gift cards that look very similar to a real credit card, which makes life easier for a would be thief as finding a legit looking credit card has become much easier. Your best ...



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