VVCS: Verifiable Visual Cryptography Scheme

Visual cryptography is a cryptographic technique to achieve visual secret sharing. Shares are distributed to every participant and overlapping a number of shares can recover the original secret. The participants´ cheating is discussed more in previous literatures. However, the issue of the distribution center´s dishonesty exists similarly in visual cryptography. In this paper, a verifiable visual cryptography scheme is proposed to verify whether the share is authorized, in which we introduce the Third Trusted Party (TTP) whose action is guaranteed. The scheme solves the participants distrusting in the center so as to improve the security of visual cryptography schemes.