In November the security company Symantec described a series of attacks on chemical firms that employed a Trojan horse: a program that came attached to an email and which infiltrated computers. What was unusual about this attack and other recent attacks is that they targeted industry rather than individuals. I have noticed that attacks on home computers and personal computers seem to have decreased recently; probably because of media cover age over the last five years, and that we are now seeing an increase in industrial cyber-spying. There are also worrying trends elsewhere, for example the Iranian nuclear program seems to have been affected by a virus. Here’s a worrying article on this. If you are interested in this aspect of computer security I recommend Misha Glenny’s new book.