Hybrid Encryption Algorithm Based on Spatial and Gray Level Information

With the rapid development of image production and applications, image security has become very important. Traditional image encryption algorithms, such as Arnold transform is used widely, but it has the defect of long transform periodicity, which costs large time and computation memory. Therefore, based on the analysis of the defect of traditional image scrambling methods, a novel hybrid encryption scheme is proposed. It uses image’s spatial and gray level information at the same time. Comparative experiments show it has the advantages of easy implementation, large key space, and good scrambling effect by only one time processing instead of many times. .