cache87

That course looks a bit to fast for a beginner. For a more gentle and enjoyable approach, look at the Khan Academy's Journey Into Cryptography:

  https://www.khanacademy.org/computing/computer-science/cryptography

"that mentality is what drives it all: if only we can get enough of these bastards, we’ll win the war"

You would have thought they would have learned something from the last couple of failed invasions - you don't win a war with technology. You win it with troops on the ground.

This is the Rumsfeld Doctrine in action, and again we'll see it fail.

That's what I loved about DOS com executables. Possibly the smallest program was:

  int 20;

which got translated into CDh 20h (4 bytes!)

Postfix when installed has pretty good defaults and works safely pretty much out of the box. Are people actually looking for third-parties like developermail when it's really not that hard?