关键词: 视觉密码，多秘密分享，环形共享份，伪装图案

Abstract: The ring shares were divided into the disguised area and the tagged secret areas. Combining with the basic matrices of (2,2) single secret visual cryptography, an operation-based multi secret visual cryptography scheme with disguised images was designed. The proposed scheme not only makes the number of secret images boundless, but also improves the pixel expansion and the relative difference of previous schemes. Furthermore, the meaningful disguised patterns can reduce the attackers' threats to shares.

Key words: Visual cryptography, Multi-secret sharing, Ring share, Disguised patterns