A top secret memo written by Canada’s spy agency warns that cyber-attacks on government, university and industry computers have been growing “substantially.” The heavily censored briefing note, obtained by CBC News using Canada’s access to information law, outlines the increasing vulnerability of Canada’s energy, financial and telecommunications systems face from cyber-attackers. “Compromises of computer and combinations networks of the Government of Canada, Canadian universities, private companies and individual customer networks have increased substantially,” says the June 2009 memo written by the Canadian Security Intelligence Service.