Toshiba has proposed a content delivery system using public key infrastructure (PKI) cards as an example of a digital rights management system for content delivery over networks. The PKI card is a smart card that can execute the public key cryptosystem. PKI is a security infrastructure using the public key cryptosystem. It is considered an effective way to avoid risks such as unauthorized interception, modification, and fabrication in electronic commerce via the Internet. In the proposed system, security transactions such as authentication and key exchange are carried out within the PKI card. The proposed system therefore provides a highly secure content delivery system.
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