• LENNY ZENO.S
• NIJA SHINING GOLD T. L
• Dr. Deepa A. J

Visual cryptography is a technique to hide the data by using encryption and decryption method. Visual Cryptography is a cryptographic techinque which allows visual information(picture, text ,etc.) to be encrypted in such a way that the decryption can be performed by human visual system It is a kind of secret sharing scheme where the secret is in the form of an image. It is split into random shares and distributed to the participants. These random shares individually don’t reveal any information of the secret image. This reduces the quality of the recovered image Pixel expansion increases the size of the shares and creates inconvenience for the participants while carrying the shares. secret image and the visible image are first converted to halftone image using Halftone error diffusion method. visual cryptography, the secret share images are transformed into meaningful shares.

Error diffusion, Halftone visual cryptography (HVC), Halftoning, Visual cryptography (VC), Cryptography, Secret sharing.

"An effective method for improving the visual quality of the grayscale images", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.571-573, June 2019, Available :http://www.jetir.org/papers/JETIR1908550.pdf

"An effective method for improving the visual quality of the grayscale images", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp571-573, June 2019, Available at : http://www.jetir.org/papers/JETIR1908550.pdf