Novel reversible image secret sharing based on Thien and Lin´s scheme using discrete Haar wavelet Transform

Security has become very important with increasing number of attacks made on digital content in today´s internet savvy world. The sharing of information in secret way has become challenging field for exploration. Many image secret sharing schemes are based on the Shamir´s secret sharing. Thien and Lin have also proposed the secret sharing based on the Shamir´s scheme using polynomial based approach. Major drawback with the Shamir´s secret sharing is the computational time. The paper proposes image secret sharing scheme based on Thien and Lin´s secret sharing using discrete Haar wavelet transform. Experimentation is carried out on 10 images. Using proposed approach, time and space complexity is reduced to great extent only with minor degradation of regenerated original image. The 62%, 78% and 82% time complexity reduction is observed along with 75%, 93% and 98% space complexity reduction for wavelet transform level 1, level 2 and level 3 respectively of the proposed novel reversible image secret sharing based on Thien and Lin´s scheme using discrete Haar wavelet Transform.