This tutorial will show you how to setup Trucha Signer, a tool which allows you to trucha sign Wii ISOs and extract files from them.
Trucha Signer v0.21
key.bin (I think it would be better if you found it on your own)
Unzip the trucha signer pack and unzip and install UltraEdit
Next run UltraEdit.exe which should be in the folder which Ultra Edit was unzipped in. Now select file and then open. Browse for a file called wiikeyset.reg which should be in the unzipp trucha signer pack.
Double click it and open it. Go Down to line 58 which should look like this:
Next open ulraedit.exe again and open the key.bin file you should have downloaded.
The key.bin file should have a line that looks like this except with a bunch of different characters instead of XXs
Go Back to wiikeyset.reg on line 58, replace the 00s with the characters of the key.bin
Now select File and Press Save. You can now close UltraEdit.
Go to the trucha signer folder and double click wiikeyset.reg, press yes. You should get a confirmation like this one:
Next open trucha.exe in the same folder. Press "Select KeySet" and select Custom KeySet 1.
If you did everything correctly, trucha signer should work fine.