2-out-of-3 Secret Sharing Scheme Using Visual Cryptography

With the rapid advancement of networktechnology, the security of secret data is threatenedbecause anyone may tend to intrude the system oreavesdrop via the communication channel. Mostsecret sharing schemes are based on cryptographysuch that the encryption and decryption processesneed high computation costs. Visual cryptography, akind of secret sharing schemes, differs fromtraditional secret sharing in terms of the efficientdecryption process. It encrypts a secret image intoseveral shares and then it can be recovered not onlycomputer but also human visual system. This paperpresents 2-out-of-3 secret sharing method by usingbit-level decomposition which can be applied tobinary, gray-scale and color images. The secret isreconstructed by stacking the encrypted shares thesecret image becomes clearly visible. Secret image isdivided into three image shares. These shares aredistributed to each of three users. Any two or allimage shares can be stacked together to recover theoriginal image perfectly