How does pinsentry device work

JavaScript is required to play this video. Have a card reader from another bank? The Barclaycard app - the convenient way to confirm it's you.

See how it works and the important stuff you need to know about using our app. See how it works. Do we have your up to date number? Additional cardholders? Need some help? How to confirm it's you with a text.

When you input the 8 digit number given by the online banking system your device runs an encrypted algorithm and spits a number back out based on your card details stored on the chip and the number input.

The banks computers obviously know these datails already so calculates the algorithm as well. If the two outputs match then bingo. We have two kinds in this country the kind you put your card in and a smaller one that has to be unlocked with it's own code. Assuming the kind you put your card in works the same basic way as the smaller ones than the suggestion given above is correct. The ones we use you unlock them with a 6 digit code you tell the website the serial number of the unit you are using every unit has it's own algorithm the website then gives you a 6 digit number you punch that into the unit and the unit spits out a different number based on it's algorithm.

The card number and the number you enter go through a hashing algorithm, the result of which is compared to the one calculated by the bank.

WOW How cool, well i have taken this one apart. And i can see a chip reader, or more of a metal contact. SO yeah i am happy with this thread outcome. What I want to know, is that does these "Calcs" have the power to kill a card three incorrect pin guesses.

Doesn't it give someone ok in theory who has the "calc" unlimited chances of guessing the pin with no recourse? If I'm not asked to confirm its me when I'm shopping online, who is responsible for any fraudulent transactions?

What if I'm unable to confirm it's me using Visa Secure when I'm shopping online? Do I need to replace the batteries in the PINsentry? What can I do if my PINsentry card reader's batteries are dead? Answers 1 to 8 of 8. Best Answer No best answer has yet been selected by fredpuli Sounds a bit like an Enigma machine.

Dunno how it works but my NatWest card works in my Barclays card reader, and vice-versa. A methematical algorythym. What's more.. The answer to this on going question that seems to be all over the internet is much simpler than and algeryhtem, but still very secure and hard to crack. The first time you place your cash card ina cash machine the banks issuer places apx 6 digit codes on your chip that is on your card, without you even knowing the codes.

The first time you then place your card into the pin sentry, and after entering your pin number, the sentry picks 1 of the 6 digit codes from the chip on your card and then displays it on the screen.