Abstract

Nowadays, vector map has developed, used in many domains, and in most cases vector map data contains confidential information which must be kept away from unauthorized users. Moreover, the producing process of a vector map is considerably complex and the maintenance of a digital map requires substantial monetary and human resources. This paper presents a simple method to encrypt and decrypt GIS vector data. In the proposed method, polylines and polygons in vector map are the target of the encryption and decryption processes. We select the significant objects in polyline/polygon layer, and then they are encrypted by the key sets generated by using Chaotic map before changing them in DWT, DFT domain. Experimental results verified the proposed algorithm effectively and error in decryption is approximately zero.