LINEAR EQUATION BASEDVISUAL SECRET SHARING SCHEME FOR SECURE IMAGE SECRET SHARING
Shridevi Avvanni, K C Ravishankar · IJITR · 2015
The Hill cipher is used to divide an image into sub-images and then the concept of random grid is applied to sub-images for construction of encrypted image. This scheme suffers from security issues. Although, the random grid is used as a second layer of security, it does not play any effective role during decryption. Secondly, even a crude guess of the coefficient matrix used in Hill cipher equations can reveal the secret. In the proposed method, a system of linear equations with secret keys (coefficients) is used to divide a secret image into sub images of smaller size. Then the concept of random grid with XOR operation is applied to the sub images for construction of the shared images. It is impossible to reveal the secret image without the knowledge of four coefficients values, encoded shares and randomgridvalues.