A linear quadtree compression scheme for image encryption

摘要: Abstract A private key encryption scheme for a two-dimensional image data is proposed in this work. This designed on the basis of lossless compression principle. The developed to have both and performed simultaneously. For effect, quadtree structure used represent image; purpose, various scanning sequences are provided. comprise encryption. Twenty four possible combinations defined accessing quadrants, thereby making available 24 n × 4 n(n − 1) 2 possibilities encode an resolution 2n 2n. security therefore relies computational infeasibility exhaustive search approach. Three images 512 pixels verify feasibility scheme. testing results analysis demonstrate characteristics can be applied problems storage or transmission public network.