Construction of XVCS for (k,n,t)∗ access structure

XOR-based Visual Cryptography System (XVCS) is developed to achieve high contrast and good resolution of the recovered secret image. In general ( k , n ) VCS, the secret image can be visualized only if k or more than k shares are stacked together. In ( k , n , t ) ∗ access structure, t number of participants are considered as the essential participants( t ≤ k ≤ n ) whose shares are absolutely necessary to reconstruct the secret image. Several methods have been already proposed for the construction of ( k , n ) ∗ VCS for black and white images. The major focus of this work is to design an XVCS for ( k , n , t ) ∗ access structure for both black and white images and color images with maximum contrast. The experimental outcome shows that the proposed method has better results than other techniques proposed so far. Also, numerical examples are provided for ( k , n , t ) ∗ XVCS for t = 1 and 2. The XVCS designed for ( k , n , t ) ∗ access structure can be used for any real time application and is demonstrated with an example of user authentication in banking system.