Distributing Confidentiality to a Visual Secret Sharing Scheme
Neethu T. Sunil, V. Tharmalingam · 2013
A Visual Secret Sharing (VSS) scheme is one realization of secret sharing schemes without using computation which distinguishes VSS from ordinary cryptography. In a typical VSS scheme (normally called a (k, n) -threshold VSS scheme), a dealer encodes a secret image in to 'n' shares each of which reveals no information regarding the secret image. In this system ,the secret image can be reproduced only by stacking n number of shares in the correct order. The reproduced images will be clearer (larger contrast) and with small pixel expansion compared to Unconditional security VSS scheme. This security notion is effective when attackers cannot use computers since it may take much time to analyze combinations of sub pixels exhaustively.