  As Critical National Infrastructures are becoming more vulnerable to cyber
attacks, their protection becomes a significant issue for any organization as
well as a nation. Moreover, the ability to attribute is a vital element of
avoiding impunity in cyberspace. In this article, we present main threats to
critical infrastructures along with protective measures that one nation can
take, and which are classified according to legal, technical, organizational,
capacity building, and cooperation aspects. Finally we provide an overview of
current methods and practices regarding cyber attribution and cyber peace
keeping
