Data security protection method and system

The invention discloses a data security protection method and system. The data security protection method is applied to data security protection of a third-generation intelligent substation auxiliary monitoring system, and specifically comprises the following steps: obtaining useful information in master station system information; and based on the obtained useful information, matching different encryption algorithms according to the importance degree to realize hierarchical encryption of the information. The data acquired by each sub-detection system in the substation auxiliary monitoring system is layered according to the importance degree, and different data encryption methods and different backup methods are adopted for the data of different layers, so that the workload of a computer is reduced, the storage space is saved, and the data transmission efficiency is improved. 本发明公开了一种数据安全防护方法及系统，所述数据安全防护方法应用于第三代智能变电站辅助监控系统的数据安全防护，具体包括以下步骤：获取主站系统信息中的有用信息；基于获取的有用信息，根据重要程度匹配不同加密算法，实现对信息的分层加密。本发明对变电站辅助监控系统中各子检测系统