ok i have just got my card reader from barclays, and after playing with it, I think it must work by useing certain numbers stored on your chip and applying them to a function to give a number, and each sucesive time the number increases so i assume it must have a internal clock which alows the number to be diffrent every time, but can any of you smart boffins out there work out the maths, just so i dont have to carry the bloody thing arround with me every time i want to log on, I mean i can just store a series of pre worked out numbers but i guess that defeats the point!
2007-11-22 22:58:51 · 3 answers · asked by Mark R 2 in Science & Mathematics ➔ Mathematics
I expect it it will be using an algorithm to generate the code from your card number (or other details stored in the card itself), possibly combined with your pin number (in some deterministic way) plus some 'increment' formula from the last number ...
If the numbers were stored in the device, each individual would have to have their own unique device (to keep costs down I would expect every PINsentry device to be identical to all others)
If it used a 'clock', well these can run fast or slow resulting in incorrect numbers being generated and the user being locked out ....
I think the whole idea is flawed .. Cards and PINsentry's can be lost or stolen and it then depends only your PIN number, of which there are only 9999 possible values...
2007-11-24 02:12:59 · answer #1 · answered by Steve B 7 · 0⤊ 0⤋
Pinsentry Card Reader
2016-12-10 08:14:14 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Pinsentry
2016-10-07 01:10:12 · answer #3 · answered by geddings 4 · 0⤊ 0⤋