In this study, the authors propose a model describing information sharing and information security measures in an<br />
organization using a memory channel communication network (CN). First, the authors highlight communication between<br />
the inner members of an organization and communication between inner and outer members, realizing a model<br />
describing intra-organizational information sharing and external information leakage. Utilizing this model, the authors<br />
determine the percentage of advanced information allocated to inner members most efficient for the organization from<br />
the viewpoint of information sharing and information security measures. Then, the allocation percentage is determined<br />
considering the structure of the CN and the characteristics of its members. The authors use simple numerical examples<br />
in order to confirm whether the model in this study truly represents communication in a real organization. The results<br />
confirm that the model is reality-based.