Special type of circular visual cryptography for multiple secret hiding

Abstract

A special type of circular visual cryptography scheme for hiding multiple secrets is proposed. The circular shares are divided into two concentric rings: the outer ring and the inner ring. On the outer ring, two different secrets are hidden, where the second secret could only be revealed by rotating one share through a θ° angle off the other. In the inner ring, two more secrets are hidden. To reveal the first secret, one of the shares must be flipped over before stacking. The second secret can only be revealed after one of the shares is rotated through a β° angle in the flipped position. Through flipping and rotating, four secrets are encrypted in the shares. The secrets in the shares are secure, as the angles to rotate or which share to flip must be known beforehand.

Keywords:

• VISUAL CRYPTOGRAPHY
• SECRET SHARING
• CIRCULAR VISUAL CRYPTOGRAPHY