The notion of visual cryptography was introduced without formalisms by Naor and Shamir in 1994. It provides a very powerful technique by which one secret can be distributed into two or more shares, when the shares on transparencies are superimposed exactly together, the original secret can be discovered without computer participation. In this paper, master or universal shares defined by some suitable Brauer configuration algebras are used to protect multimedia database systems and in particular digital biometric data (e.g., iris, fingerprints, handwritten signatures, DNA, faces, etc). Master shares allow to conceal effectively and efficiently multiple secrets between a number of trusted parties. In this proposal such master shares are encoded by sequences of integer numbers, thus saving storage space of the database servers involved in the protection process. According to the procedure, a master share is obtained via a digit sequencing algorithm (DSA), which define elements of a database as linear combinations of basic elements of a suitable Brauer configuration algebra (BCA).

视觉密码学的概念是在1994年由Naor和Shamir引入的，无需形式主义。它提供了一种非常强大的技术，可以将一个秘密分配给两个或多个份额，当透明胶片上的份额精确地叠加在一起时，原始秘密可以被分配。在没有计算机参与的情况下发现的。在本文中，由某些合适的Brauer配置代数定义的主共享或通用共享用于保护多媒体数据库系统，尤其是数字生物统计数据（例如虹膜，指纹，手写签名，DNA，面部等）。主共享可以有效地隐藏许多受信任方之间的多个秘密。在此建议中，此类主份额由整数序列编码，从而节省了保护过程中涉及的数据库服务器的存储空间。根据该过程，可通过数字排序算法（DSA）获得主共享，该算法将数据库的元素定义为合适的Brauer配置代数（BCA）的基本元素的线性组合。