Distributed denial of service attacks appear to be getting smaller, shorter, and more persistent. More than 51% of network layer DDoS attacks lasted barely 15 minutes and another 10% or so for between 15 and 30 minutes. Imperva attributed the trend to the use of so-called “stresser” or DDoS for hire services that allow almost anyone to launch small attacks against targets of their choice for prices starting at around $5. Many security experts expect a sharp increase in DDoS attack this year by actors seeking to impact the US presidential elections.”]