It's not a private key it's a brainwallet.
1 ) Go to
https://www.bitaddress.org/2 ) click on brainwallet (upper right)
3 ) Disconnect from internet
4 ) Verify that you are offline
5 ) Be 100% sure you are offline
6 ) Verify steps 4 & 5
7 ) Click on show so you can see what you are typing.
8 ) Put in what is there in the enter passphrase box CApitAlizatiON matters
9 ) Click on view it should show the address and the private key.
-Dave
I'm going to brain wallet , i am putting the key that i found in the hologram but it generates a different address than the one in the certificate . Also , do you know where should i use the certificate's public key or it's not necessary ? Thanks for your time .