Abstract: Internet has made the path of information easy and convenient, yet it has put security of information at stake. The use of critical information by adversary can be catastrophic and hence security of information is rather a necessity than the facade. Images play an indispensable part in information exchange. Their role in the field of military, architecture, medicine, communication cannot be undermined. Image information hiding is broadly divided in two categories , first, image watermarking and second image cryptography. Over recent years, image encryption has gained much attention. The paper gives a brief insight of different image encryption techniques that have been proposed in recent years.

Keywords: Image encryption, chaotic maps, pseudo random generators, blockchain, block ciphers, stream ciphers.

| DOI: 10.17148/IARJSET.2021.8463