If you're downtown during the Chicago NATO Summit, security experts say your laptop computer may be targeted by attackers or borrowed by freeloaders. | Getty Images/iStockphoto

Tom Kellermann, CISM, Vice President of Cyber Security Trend Micro USA spoke at the Westin Hotel about the probability that local residents can expect a huge surge in attempted attacks on websites because of the NATO summit being here in Chicago. | Al Podgorski~Chicago Sun-Times

Tom Kellermann, CISM, Vice President of Cyber Security Trend Micro USA spoke at the Westin Hotel about the probability that local residents can expect a huge surge in attempted attacks on websites because of the NATO summit being here in Chicago. | Al Podgorski~Chicago Sun-Times

Tom Kellermann, CISM, Vice President of Cyber Security Trend Micro USA spoke at the Westin Hotel about the probability that local residents can expect a huge surge in attempted attacks on websites because of the NATO summit being here in Chicago. | Al Podgorski~Chicago Sun-Times

Tom Kellermann, CISM, Vice President of Cyber Security Trend Micro USA spoke at the Westin Hotel about the probability that local residents can expect a huge surge in attempted attacks on websites because of the NATO summit being here in Chicago. | Al Podgorski~Chicago Sun-Times

Tom Kellermann, CISM, Vice President of Cyber Security Trend Micro USA spoke at the Westin Hotel about the probability that local residents can expect a huge surge in attempted attacks on websites because of the NATO summit being here in Chicago. | Al Podgorski~Chicago Sun-Times

Tom Kellermann, CISM, Vice President of Cyber Security Trend Micro USA spoke at the Westin Hotel about the probability that local residents can expect a huge surge in attempted attacks on websites because of the NATO summit being here in Chicago. | Al Podgorski~Chicago Sun-Times