DCT Domain Color Image Block Encryption Algorithm Based on Three-Dimension Arnold Mappin

It is gradually becoming one of the hot research topics that the information encryption methods based on high-dimensional chaotic mappings are increasing in the performances such as encryption strength, security and encryption speed than low-dimensional chaotic mappings. On studying extensive reference, the author of this article put forward a DCT domain color image block encryption algorithm based on three-dimension Arnold mapping, whose core includes position random shift, three-dimension Arnold scrambling transform and coefficient symbol encryption for DCT coefficient. The experiments prove that this algorithm not only has high security but also greatly improves the speed of encryption and decryption.