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1.发明公开公开(公告)号：US20240056288A1
公开(公告)日：2024-02-15
申请号：US18260113
申请日：2021-01-14
发明人： Keizo MURAKAMI , Yuki OKANO , Tetsutaro KOBAYASHI
CPC分类号： H04L9/0618 , H04N7/15
摘要： 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.
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公开(公告)号：US20240048362A1
公开(公告)日：2024-02-08
申请号：US18258932
申请日：2021-01-14
发明人： Mana UENO , Tetsutaro KOBAYASHI , Keizo MURAKAMI
IPC分类号： H04L9/08
CPC分类号： H04L9/0825 , H04L9/0844 , H04L9/0894
摘要： 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.
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公开(公告)号：US20240205206A1
公开(公告)日：2024-06-20
申请号：US18555615
申请日：2021-05-19
发明人： Yuki OKANO , Tetsutaro KOBAYASHI , Keizo MURAKAMI , Tetsuya OKUDA
CPC分类号： H04L63/061 , H04L9/0643 , H04L9/3213
摘要： A hey exchange system includes a plurality of terminals that perform key exchange; and a server that performs authentication of each of the terminals and mediation of the key exchange. The server is configured to generate a nonce used when the authentication is performed between the server and the terminal by federation using OpenID Connect; generate a public key and a secret key of token control encryption; transmit the nonce and the public key to the terminal; and decrypt a ciphertext received from the terminal by using the secret key and a token received from the terminal. The terminal is configured to generate a ciphertext obtained b encrypting predetermined data by using the public key and a token generated from the nonce; and transmit the ciphertext to the server.
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公开(公告)号：US20240129111A1
公开(公告)日：2024-04-18
申请号：US18555610
申请日：2021-05-19
发明人： Yuki OKANO , Tetsutaro KOBAYASHI , Keizo MURAKAMI , Tetsuya OKUDA
CPC分类号： H04L9/0819 , H04L9/06 , H04L9/3213
摘要： A key exchange system according to an embodiment includes: a plurality of terminals that perform key exchange; and a server that performs authentication of each of the terminals and mediation of the key exchange, in which the server includes a nonce generation unit that generates a nonce used when the authentication is performed between the server and the terminal by federation using OpenID Connect, a key generation unit that generates a public key and a secret key of token control encryption, a first transmission unit that transmits the nonce and the public key to the terminal, and a decryption unit that decrypts a ciphertext received from the terminal by using the secret key and a token received from the terminal, and the terminal includes an encryption unit that generates a ciphertext obtained by encrypting predetermined data by using the public key and a token generated from the nonce, a second transmission unit that transmits the ciphertext to the server, and a long-term secret string generation unit that generates a long-term secret string for use in the key exchange, by using the nonce.
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