Nippon Telegraph and Telephone Corporation

Ntt Corporation

Keizo Murakami

Tetsutaro Kobayashi

Yuki Okano

Mana Ueno

A communication system includes an information processing device that provides a video conference service; and communication terminals using the service. The information processing device records communication data related to a video conference encrypted and transmitted from each communication terminal in a first storage for the communication terminal; transmits, to the communication terminals, a ciphertext obtained by encrypting an encryption key capable of decoding each item of the communication data recorded in the first storage such that the encryption key can be decoded by the communication terminals; and transmits the communication data recorded in the first storage to the communication terminals. Each communication terminal decodes the communication data for the communication terminal using a decoding result of the ciphertext; and reproduces video and audio included in the communication data decoded for the communication terminal in synchronization with the others based on control data in the communication data.

Communication system, information processing apparatus, communication method and program

An encryption apparatus including a key storage unit that stores a secret key and a public key of public key encryption, and an encryption unit that encrypts communication data using the secret key and the public key.

Growing community of inventors

Tokyo, Japan

Keizo Murakami