Review of image encryption and compression techniques.

This paper presents a survey on image encryption and compression techniques. The main aim of using encryption and compression together is to reduce the size; to ensure a quality during reconstruction; to reduce bandwidth requirement, to increase the speed of data communication over a network; to reduce the computational time, and to ensure its safety. To carry out the Image compression and encryption together three different ways are there. The three existing combinations are as encryption technique followed by compression, in this method compression ratio is more, but there are some security issues as compared with next. The next combination is a compression technique followed by encryption technique, in this method, researchers focus more on security of the image rather than to compress the size of the image. The last combination is joint encryption and compression strategies in this strategy encryption and compression happens at the same time either to some extent or as compressive detecting. With low computational time it gives a decent security. The compression procedure utilized in every one of the blends can be lossless, lossy, or mix of both. [ABSTRACT FROM AUTHOR]