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We have started to use a fob reader in my workplace; the reader is plugged into a Windows PC and when there is a browser with an input box open on the PC the fob key is swiped on the reader.

The value that is read from the fob key by the reader then appears in the input box on the browser. It is a hexidecimal value (A7EE9E54). There is a number typed on the fob key so I am wondering is there some hashing algorithm that is used to convert that number to the value that is read from the reader?

I need to gather all the hexidecimal values from 45 key fobs and input them into a database.

Does that mean I have individually swipe every fob key on the reader and enter it into the database?

Or is there a way of decrypting the hash key value from the number on the fob key?

Do all fob readers have an inbuilt hashing algorithm that reads a value from the fob key and converts it to a hashed format?

Thank you.

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  • There are hundreds of fob variants in the market. Can you be specific which make/model are you talking about?
    – Naveed Ahmed
    Commented Apr 22 at 13:59
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