Most businesses are <A HREF="http://news.bbc.co.uk/1/hi/technology/4809262.stm">not doing enough</A> to secure their networks against identity fraud, a UK government survey says. Growing numbers of firms are using strong authentication to restrict unauthorized access, according to the Department of Trade and Industry. But large companies still recorded a small increase in identity-related security breaches during 2005. The DTI is urging firms to install multi-layered security systems and not to rely entirely on password access.