A survey and taxonomy on different image encryption mechanisms

Data encryption has been one of the pivotal domains for research. For a long time, it has happened to be a field of enormous research work because of its aspect of strong data protection. Initially data used to be handled in text formats only, but with time and advancement, data became available in various other formats as well other than just text. With progress in technology, the advent of digital images also started becoming rampant on a rapid scale. They are implemented in diverse systems of communication. Encryption concept also started getting prominence as a part of safeguarding method. A number of encryption algorithms have been put forth and tested with respect to their robustness and efficacy. Image degradation due to continuous capture and transmission has also been looked upon, to minimise the noise impact. This paper outlines the basics of digital image processing and allied concepts with its principle highlight on image encryption methods and the different kinds of noise laying impact on the images.