The core communication protocols used on the Internet do not natively provide confidentiality for data. 因特网上使用的核心交换协议并不主动地提供数据保密。
In data security, a policy that restricts access to classified information to pe rsonnel whose duties necessitate such access. 数据保密中的一种存取保密原则，它将分类信息的存取权限限制在只给需要这种权限的人。
