Abstract: Visual cryptography is a technique for encryption by dividing a secret image into n shares and recovering the image by superimposing the shares. However, there may be deceptive behavior during the process of reconstructing the secret image. This paper proposed a multi-level visual cryptography scheme based on random grids to address this problem. The scheme introduces a trusted third party (TTP) to address this issue. The scheme verified XOR on shares at each level during secret distribution and recovery processes. Experimental results demonstrate that the proposed scheme effectively detects deception by distributors and participants, enhancing security during implementation.

Key words: visual cryptography, random grid, deceptionresistance, multilevel, trusted third party

摘要： 可视密码是通过将秘密图像分成n份共享图像实现加密、并通过叠加共享图像恢复图像的一种秘密共享图像技术.但是在其恢复秘密图像的过程中可能存在欺骗行为.针对这一问题，通过引入可信第三方，提出了一种基于随机栅格的防欺骗多级别可视密码方案.方案在秘密分发和恢复的过程中均可对各级别的共享图像进行验证.实验结果显示，该方案可有效检验分发者和参与者是否存在欺骗行为，提高了方案实施过程中的安全性.

关键词: 可视密码, 随机栅格, 防欺骗, 多级别, 可信第三方