Region splitting visual cryptography using random grids

Visual cryptography is encryption technique to hide secret image into noise-like images, called as shares. Shares are stacked together to decrypt secret image. This paper presents multiple secrets sharing scheme called region splitting visual cryptography (RSVC) using random grids. To share n secrets, n shares are utilized along with common universal share. Proposed method has following features:(1) universal share for all secret messages, (2) any number of shares cannot reveal any information of universal share and secret messages, (3) no pixel expansion of shares, (4) no codebook requirement, and (5) human visual system is employed to decrypt the secret messages where no computational device or cryptographic knowledge is required.