This Millennium started with an intensive development of ICT E-Government systems and online applications as a support of almost all Governments and local authorities for better communication between Government bodies, as well with citizens and commercial entities. The Internet was hailed as an integrator of cultures and a medium for business, consumers, and governments to communicate with one another. We noticed certain vulnerabilities with opening ICT systems and architecture to open community, which could lead to cyberattacks and potential blocking of normal functions of government institutions. On the other side, widely developed online services, Open National registers and knowledge base, at E-Government as well Smart Cities in local municipalities, could be used for better preventive control of possible terrorist attacks. But such measures could lead authoritarian governments and agencies with low level of public accountability to violate privacy, decrease the free flow and transparency of information, and restrict freedom of expression, thus adding a heavy price by diminishing civil liberties more than terrorism itself. This article addresses Cyber Identity measures which could lead to better prevention of cyber and other terrorist attacks.