Verifiable image Secret Sharing in Matrix Projection using watermarking

Abstract

Verifiable Secret Sharing Schemes (VSSS) allow the participants to verify their shares as consistent. Verifiable Secret Sharing provides the verifiability of the received shares to the participants. Most of these schemes require additional computation in the form of certificate vectors or error correction codes. This paper presents a threshold verifiable secret sharing in Matrix Projection using watermarking. In this scheme at the time of construction of shares a watermark image (which is public image) is shared along with the secret image. During reconstruction phase two images get retrieved - watermark image and secret image. The verification of the retrieved watermark image verifies the accuracy of reconstructed secret image. The addition of watermark image is not increasing the size of image shares. The proposed scheme achieves reliability and verifiability by combining matrix projection secret sharing with watermarking.