Abstract

Nowadays, a large volume of valuable vector map dataset has been distributed illegally by pirates, hackers, or unauthorized users. Thus, the problem focuses on how to protect the copyright of vector map data for storage and transmission. This paper presents an encryption algorithm for vector data. In proposed algorithm, vector map is separated to select polyline/polygon layer. We use three simplification algorithms to define the feature points in each object. After that, we select randomly vertices of objects based on the ratio of the feature points and encrypt them with key values. Experimental results show the high efficiency visualization by low complexity, high security performance and cryptography. In addition, experiments also show unique performance, decryption error approximate zero and computation time is better than the exist algorithms.