Regular Slashdot contributor Bennett Haselton writes in to say "The December 1st release of Psiphon has sparked renewed interest in the various software programs that can help circumvent Internet censorship in China, Iran, and other censored countries. (Some of this interest undoubtedly being motivated by the fact that many of these programs also work for getting around blocking software at work or school.) Have you ever wanted to understand the science behind these programs, the way that mathematicians and codebreakers understand the magic behind PGP? If you loved the mental workout of reading "Applied Cryptography", have you ever wanted a tutorial to do the same for Psiphon and Tor and other anti-censorship programs?" The rest of his editorial follows.