Hitachi, Ltd.

Josuke Matsuki

Yukihiro Shimmura

Masashi Takatsuki

The communications between terminals are encrypted, and even a gateway device is permitted to analyze the encrypted communications, thereby to incarnate censorship for the prevention of information leakage. A gateway deviceprepares a public key and a secret key in a pair on the basis of a public key encryption system, and distributes the public key to terminals-which are managed by the gateway device. The terminals-subject a communication packet to a prior-art common key encryption, and they thereafter encrypt a common key with the public key and bestow the encrypted common key on the packet. The gateway devicedecrypts the common key by using the secret key, censors the packet and returns the packet into a prior-art encrypted packet format, and it thereafter transfers the packet to a networkwhere opposite terminals-exist.

Growing community of inventors

Yugawara, Japan

Josuke Matsuki