This article is an introduction to two fundamental primitives in cryptographic protocol theory: commitment schemes and zero-knowledge protocols, and a survey of some new and old results on their existence and the connection between them. 1 What’s in this article? This article contains an introduction to two fundamental primitives in cryptographic protocol theory: commitment schemes and zero-kno...

This article is an introduction to two fundamental primitives in cryptographic protocol theory: commitment schemes and zero-knowledge protocols, and a survey of some new and old results on their existence and the connection between them. 1 What’s in this article? This article contains an introduction to two fundamental primitives in cryptographic protocol theory: commitment schemes and zero-kno...

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Linear preserver problems is an active research area in matrix and operator theory. These problems involve certain linear operators on spaces of matrices or operators. We give a general introduction to the subject in this article. In the first three sections, we discuss motivation, results, and problems. In the last three sections, we describe some techniques, outline a few proofs, and discuss ...

one of the most important problems in organization and management research is uncompatibility of subject and research method. traditionally researchers of management and organization have used research methods of natural sciences to explore the unknown of organizations. in this article, author tries to introduce qualitative research as an appropriate approach to solve the mentioned problem. nat...