COMPARATIVE STUDY OF VARIOUS CRYPTOGRAPHYTECHNIQUES

Abstract

Cryptography the effective and secure protections of sensitive information are primary
concerns in commercial, medical and military systems. To address the reliability problems for
secret images, a visual cryptography scheme is a good alternative to remedy the
vulnerabilities. Visual cryptography is a very secure and unique way to protect secrets. To
maintain the secrecy and confidentiality of images two different approaches are being
followed, Image Encryption and Visual Cryptography. The former being encrypting the
images through encryption algorithms using keys, and the later approach involves dividing
the image into random shares without the use of keys. Unfortunately heavy computation cost
and key management limit the employment of the first approach and the poor quality of the
recovered image from the random shares limit the applications of the second approach.