监控视频中多级密钥派生研究与实现

Research and implementation of multi-level key derivation in video surveillance

针对整路监控视频采用传统无差别加密方式带来的密钥存储开销大、安全性低以及用户间操作管理复杂问题,提出一种基于等级树的多级密钥管理方案。根据根密钥与等级树结构进行用户等级密钥派生,用户只需存储自身密钥,降低密钥存储开销;派生多级视频数据密钥时,通过将用户等级与视频数据的分级标识作为算法因子,提高密钥安全性的同时降低用户间访问操作复杂难度。实验结果表明,该方案的存储开销以平方级速度减少,安全性、管理效率都得到改善。

Aiming at the problem of large key storage overhead,low security and complex operation management between users when the traditional indifference encryption method is adopted for the monitoring video,a hierarchical tree-based multi-level key management scheme was proposed.User-level key derivation was implemented according to the root key and the hierarchical tree structure.The user only needed to store their own key,which reduced the key storage overhead.When the multi-level video data key was derived,the user level and the hierarchical identification of the video data were used as algorithm factors,which improved the key security and solved the complicated difficulty of the access operation between users.Results show that the storage cost of the scheme is reduced greatly,and the security and management efficiency are improved.