Jeff Pulver interviews Phil Zimmermann in VON magazine. Due to the annoying embedded reader technology that VON uses, I can't give a direct page link, but the magazine
can be found here.
I'm thrilled to learn that Phil had
Codes and Secret Writing by Herbert S. Zim, this was also a favourite book of mine as a kid. Folks, you too can be a crypto expert if you've got "Zim" in your name...