Abstract
Although the Internet which has accomplished rapid progress in recent years is convenient and efficient, the negative sides, such as a threat of a virus and unauthorized access, are also actualized. In order that these threats may realize not an exception but safe and secure Internet environment also in scientific environment, construction of a public key infrastructure (PKI) is desired, but the deployment is not sufficient. Generally it is said that PKI is high cost structure, and it is one of the reasons to PKI deployment. This paper clarifies cost structure in PKI quantitatively, and contributes it to campus PKI spreading and promotion.
