LulzSec attack on MilitarySingles.com was caused by poor web application design and inadequate encryption, Imperva says. Site operator had denied that a serious incursion had happened at the time of the March hack. Site operators should accept that Web 2.0 social media now poses a significant security risk, says Imperva CTO, Amichai Shulman. Despite the denials, this view now looks optimistic given the site’s denials of a serious breach of security.”]