Характеристические множества идеальных схем разделения секрета

The secret sharing scheme with $\Gamma$ аз the access structure is a method for the distribution of the information between the participant of set $P$ so that a subset of participants can determine the key if and only if that subset is in $\Gamma$. In this paper the access structure of ideal secret sharing scheme in the rank 2 case is described in terms of group theory.