A Critical Study on Encryption Based Compression Techniques
C. Sankara Narayanan, S. Anna Durai · Journal of Computers · 2016
The main goal of this study is to present an overview on the various encryption based compression techniques.By surveying the various encryption, compression and embedding techniques, the optimal encryption based compression technique is estimated.In communication systems, the data from the source is first compressed and then encrypted before forwarding over a channel to the receiver.But, in multiple practical scenarios, the image encryption has to be performed prior to the image compression.This leads to the problem of how to formulate the combination of encryption and compression algorithms.Compressing the image after encryption is found to be more efficient.For the image encryption, the input images are initially transformed.The encrypted images are then compressed and reconstructed using standard algorithms.This paper presents a survey on the various image encryption algorithms such as Blowfish algorithm, RC4, Data Encryption Standard (DES), etc. Further, the various image embedding techniques such as Discrete Wavelet Transform (DWT), Undecimated Wavelet Transform (UWT), etc., and the various compression techniques such as Set Partitioning in Hierarchical Trees (SPIHT), Arithmetic Encoding (AE), etc., are surveyed.The analysis results show that the combination of the Blowfish, RC4, UWT and SPIHT can provide high quality reconstructed image.