Reading hotel key cards with a credit card magstripe reader
In Summary : I ran my credit-card code over the hotel mag stripes to see if there was odd parity with all the 5 bit chunks or all the 7 b...
https://updatesinfosec.blogspot.com/2018/07/reading-hotel-key-cards-with-credit.html
In Summary :
I ran my credit-card code over the hotel mag stripes to see if there was odd parity with all the 5 bit chunks or all the 7 bit chunks. No, unfortunately not. Another reason the cheap magstripe reader probably failed.
Then I ran some frequency analysis on the 1′s and 0′s. Maybe a lot of the 5-bit chunks are all the same value? Or the 7-bit chunks? I’d see something similar on the credit card magstripe. There were 20 spaces on the 7-bit magstripe. So, using frequency analysis, I should have been able to guess 7-bit characters were being used.
By splitting some of the hotels magstripe data into 8-bit chunks, we notice that the same string of 1′s and 0′s occurs many more times than you’d expect. So my best guess is that 8-bit characters are used.
[...]
kindly refer the following link as follow up :
https://ift.tt/2z92MxT
I ran my credit-card code over the hotel mag stripes to see if there was odd parity with all the 5 bit chunks or all the 7 bit chunks. No, unfortunately not. Another reason the cheap magstripe reader probably failed.
Then I ran some frequency analysis on the 1′s and 0′s. Maybe a lot of the 5-bit chunks are all the same value? Or the 7-bit chunks? I’d see something similar on the credit card magstripe. There were 20 spaces on the 7-bit magstripe. So, using frequency analysis, I should have been able to guess 7-bit characters were being used.
By splitting some of the hotels magstripe data into 8-bit chunks, we notice that the same string of 1′s and 0′s occurs many more times than you’d expect. So my best guess is that 8-bit characters are used.
[...]
kindly refer the following link as follow up :
https://ift.tt/2z92MxT
