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How many 3-pass AES128 keys are in a MIFARE PLUS X tag ?

Question asked by Alvaro Vidaurreta on Jul 19, 2019
Latest reply on Jul 23, 2019 by Jonathan Iglesias

Hi everyone,

 

I have a project open where an authentication tag must be used, but firstly I need to know how many Keys can be stored in the selected Tag.

 

I checked the datasheet of MIFARE PLUS X tag ( 4KBytes ) and it said that it can use 2 AES 128-bit keys per sector ( 80 sectors total).

Then the maximum amount of different keys in a MPLUS tag is 160 ?

 

Also as I concern this keys are used to unlock the sectors, not to apply the 3-pass-authentication protocol. 

Could I switch the 3-pass key to one of this sector keys or it is fixed ?

 

Thanks in advance,

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