Quote from: niooron on December 02, 2012, 05:22:51 PM

Code:

if (txtPassphrase.Text != "") {
   SetText(txtPrivWIF, new Bip38KeyPair(kp, txtPassphrase.Text).EncryptedPrivateKey); //<-loop this?
   } else {
   SetText(txtPrivWIF, kp.PrivateKeyBase58);
   }
   SetText(txtPrivHex, kp.PrivateKeyHex);
   SetText(txtPubHex, kp.PublicKeyHex);
   SetText(txtPubHash, kp.Hash160Hex);
   SetText(txtBtcAddr, new Address(kp, AddressTypeByte).AddressBase58);

I don't understand very much, but we have to search for all combinations looping this piece of code?
How can we arrive at the public key if random keys get encrypted with the password?

No, this code generates new keypairs unrelated to the one in the note. You want to loop the code in btnPrivWIFToHex_Click (in Form1.cs), with the encrypted key for txtPrivWIF.Text and different password values for txtPassphrase.Text.