I had no idea that Waterloo was so into security research. I'm pleasantly surprised to see that some of the people in the department help develop OTR, which I've been using for just over a year (it was especially comforting while I was studying in China). As it stands now, Waterloo is at the top of my list of places I'll apply for grad school. Thanks for the great recommendation!
Keep in mind that a lot of UBC graduate students actually come from Waterloo. While Waterloo (and maybe SFU) have a good/strong CS department, they're strong in undergraduate.
http://crysp.uwaterloo.ca/