Why you don't have to worry about secrecy of votes? Here's the most intelligent and most non-technical answer my wise friend Koh Wee Sun has got to offer:
If BN loses, it would have no power to persecute you.
If BN wins, it would have no way and time to open the ballot boxes to examine.
Think for yourself, if you are the BN, would you open tens of thousands of ballot boxes and count hundreds of ballots in them, one by one against the numbers, to see who has voted whom? It really does not make sense!