一种分层压缩的高精度矢量地图加密方法

摘要

传统的矢量数据加密算法主要是直接对数据加密,忽略了矢量数据的结构与冗余.针对此类问题,提出利用分层压缩的矢量数据加密方法.首先,结合矢量数据结构特点,使用最小编码单元对线目标和面目标进行SEC压缩;其次,通过随机置乱MCOs的平均点距离对矢量数据位置加密;最后,使用XOR操作对MCOs顶点方向进行循环加密,达到加密矢量数据几何形状的目的.实验结果表明,该方法明显降低了加密过程计算量,与普通加密算法相比,在保证矢量数据精度和安全性的情况下,提高矢量数据加密效率.%The traditional algorithm of vector data encryption is to encrypt the data directly,which ignores the structure and redundancy of vector data.An encryption method for vector data is proposed.Firstly,combining with the characteristics of vector data structure,SEC lossless compression of line target and face target is carried out by using minimum coding unit.Secondly,the location of vector data is encrypted by the average distance of random permutation MCOs.Finally,the XOR operation is used to encrypt the MCOs vertex direction,so as to achieve the purpose of encrypting the vector data geometry.The experimental results show that the proposed method can significantly reduce the amount of computation.Compared with the conventional encryption algorithm,the vector data encryption efficiency is improved when the vector data precision and security are guaranteed.