Passwords don't work, because they will ask you for the passwords (for all the devices they find in your luggage as soon as you get the special treatment). You don't have to tell it, but they also don't _have_ to let you in. Got the picture?

The best way to avoid getting singled out is to look like any other tourist with tourist clothes and a lot of luggage.

I made the mistake to mix tourist clothing with only a bag for my macbook for a short trip to Singapore while staying in Australia with a 3 month tourist/business visa.

Entering Australia with a tourist/business visa and without luggage looks suspicious. If you take a short trip to Singapore make sure you wear a business suit, or take a lot of luggage with you to look like a pissed of tourist. But nothing in between ;)