This allows Site A to communicate with Sites B and C using a single security device and key management system -- but different keys -- without making communications with either party vulnerable to the other.

• 这就允许A场点利用单一的安全装置和密钥管理系统（但不同的密钥）与B场点和C场点进行通信，而不与易受其它方攻击的一方进行通信。