The digital revolution of the world along with the fast communication system and the technical advancement of the digital images provide the easiest way to communicate data in the form of Images. There are many open threats and risk involves if these image data is compromised. This paper provides a theoretical study of existing methods for the image security. The archival works from IEEE, Elsevier, Springer and some other relevant articles are considered to do literature study of the problem formulation, algorithms and performance metrics. Various aspects of data integrity, privacy, and attacks are also discussed in this paper. The organized outcome is contributory to the researchers, industry, and academician who keep interest in image security domain.