The cost of individual cyber attacks fell dramatically in the US last year but unauthorised access and the theft of proprietary information remain top security concerns. The 10th annual Computer Crime and Security Survey, put together by the Computer Security Institute (CSI) in conjunction with information security experts at the FBI, shows financial losses resulting from security breaches down for the fourth successive year. The cost of breaches averaged $204,000 per respondent – down 61 per cent from last year’s average loss of $526,000.