• Research on vector data encryption method based on SM4 algorithm

Abstract

With the development of Internet technology, it is easier to obtain vector data, and it is necessary to ensure the security of data storage and transmission. This paper presents a method of vector data coordinate encryption in Shapefile format using domestic password SM4 algorithm, which can ensure data security without changing the vector data structure. The system clock is used as the random seed to generate the encryption key, and the coordinate sequence of each element of vector data is read. Firstly, the coordinates are preprocessed according to the ID of the element, and then the encryption key is used to encrypt the coordinate information to obtain the ciphertext data. The experiments verify the feasibility of the domestic cipher SM4 algorithm to encrypt vector data. The encryption efficiency can reach 90M/S, and the decryption efficiency can reach 92MB/S. The encryption method can protect the storage security of vector data, improve the theoretical system of vector data encryption, and has certain research significance.