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<p>[QUOTE=&quot;Conder101, post: 1604664, member: 66&quot;]I don&#039;t need to break the encryption, I just have to record the signal and program my chip to broadcast that same signal.&nbsp; I don&#039;t have to know what it actually says.&nbsp; You did note that I did say they would have to physically get their hands on the original coin to record the signal.&nbsp; But attend auction lot viewing that isn&#039;t too difficult.&nbsp; Have a very low powered reader in a small box that I have sitting in front of me at the viewing table.&nbsp; As I view each lot I rest it on the top of the box and the reader copies its signal.&nbsp; then I look at the next lot.&nbsp; At the end of the day I have thousands of rfid signals from genuine slabs that I can now make copies of.&nbsp; And I can make multiple copies of each one and they will all broadcast the proper rfid signal claiming to be the original slab.&nbsp; And since it is just a one to one copy of the original signal, if you use a reader that CAN decrypt the signal it will report the same thing for the copies as it would for the original.</p><p><br /></p><p>Now with some more computing power in the chip we can get around that.&nbsp; If the chip takes a coded input signal and runs that through a coding algorithm the output signal will be different every time and will be dependent on what the input signal was.&nbsp; And of course your reader is going to have to have the same algorithm built into it so it can generate the same response for comparison.&nbsp; I know microprocessors are tiny but can we get it all into a tiny non-intrusive chip that will fit inside a slab and still run off the power received from the signal from the inquiring reader?&nbsp; Or is it going to need an internal power source?[/QUOTE]</p><p><br /></p>

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