解密区域完美恢复的区域递增式视觉密码方案构造

为了优化区域递增式视觉密码的恢复效果，该文通过为共享份添加身份标识，并结合随机数，构造了单个参与者持有多个共享份的异或单秘密视觉密码方案，在此基础上，设计了异或区域递增式视觉密码的秘密分享与恢复算法。对于解密区域利用异或单秘密方案进行分享，对于未解密区域，通过填充随机数实现秘密遮盖。实验结果表明，该方案可以实现解密区域图像的完美恢复，且有效减小了共享份的存储与传输开销。

Region Incrementing Visual Cryptography Scheme with Decrypt Regions Perfectly Recovered

In order to optimize the recovery quality of Region Incrementing Visual Cryptography Scheme (RIVCS), by adding identities for shares and combing the random numbers, an XOR-based single-secret sharing Visual Cryptography Scheme (XVCS) with individual participant holding multi-share is designed. On basis of this, the secret sharing and recovering algorithms for XOR-based RIVCS (XRIVCS) are designed. For the decrypt regions, XVCS is used to share, and for the not decrypt regions, the random numbers are filled to keep the secret. The experimental results show that, the proposed scheme can realize the perfect recovery of decrypt regions, and decrease the storage and transmission cost effectively.