Rotation Visual Cryptography Using Basic ( 2 , 2 ) Scheme

Visual cryptography scheme is the concept of encrypting a secret image into n(more than one) shares. Rotation Visual Cryptography scheme (RVCS) allows four secret images to be encrypted into two shares. Using Human Visual System, again the four secret images can be easily recovered by placing the two shares on top of each other with different angles. In this paper proposes a Rotation Visual Cryptography using basic (2,2) scheme which encrypts three secret images into three shares and each secret image can be easily revealed by overlaying one share with the 1800 anticlockwise rotation of another share. In this way the combination of any of the two shares reveals one secret image with the help of 1800 anticlockwise rotation. The reconstructed original three secret images have the same contrast as achieved in the basic visual cryptography scheme (2, 2). KeywordsVisual Cryptography, Rotational cryptography, secret sharing algorithm