Abstract
The effective and secure protections of sensitive iare primary concerns in commercial, medi cal 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. Visual cryptography is an encr yption technique which is used to hide information which is present in an image. U nliketraditional cryptographic schemes, it uses hum an eyes to recover the secret without any complex decryption algorithms and the f acilitate of computers. It is a secret sharing sche me which uses images distributed as shares such that, when the shares ar e superimposed, a hidden secret image is revealed.I n this paper we represent various cryptography technique and research work do ne in this field.
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