ETSI TR 103 303审查了保护损失基础设施的作用和后续措施 或全部或部分损害将对该国的一项或多项经济活动造成重大负面影响 利益相关者、人口的安全、保障或健康，其中此类基础设施在下文中称为 关键基础设施（CI）。由此产生的关键基础设施保护（CIP）措施和流程 CI全部或部分由ICT技术组成，使用网络安全机制进行定义并与之相关 确定了需要实施的机制。

ETSI TR 103 303 reviews the roles and subsequent measures for the protection of any infrastructure for which loss or damage in whole or in part will lead to significant negative impact on one or more of the economic activity of the stakeholders, the safety, security or health of the population, where such infrastructure is hereinafter referred to as Critical Infrastructure (CI). The resulting measures and processes for Critical Infrastructure Protection (CIP) where the CI in whole or in part is composed of ICT technologies using Cyber-Security mechanisms are defined and relevant mechanisms to be implemented are identified.