Multimedia network system
First Claim
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1. A multimedia network system for transmitting real-time communication type information and storage type information using at least one transmission path, comprising:
- a transmitting terminal comprising secret-key encryption means for encrypting the real-time communication type information by a secret-key system in which only transmitting and receiving terminals of the information have encryption and decryption keys, public-key encryption means for encrypting the storage type information by a public-key system in which all the terminals commonly share their own encryption keys, and only a receiving terminal of the information has its own decryption key, and control means for causing said secret-key encryption means to change a common encryption key in each communication, and causing said public-key encryption means to encrypt and transmit the changed key.
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Abstract
There is disclosed a multimedia network system for transmitting real-time communication type information such as a television video signal and storage type information such as a computer file using at least one transmission path. The real-time communication type information is encrypted by a secret-key system, and the storage type information is encrypted by a public-key system. A common encryption key of the public-key system is changed in each communication. High-speed information can be safely encrypted and transmitted.
135 Citations
14 Claims
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1. A multimedia network system for transmitting real-time communication type information and storage type information using at least one transmission path, comprising:
a transmitting terminal comprising secret-key encryption means for encrypting the real-time communication type information by a secret-key system in which only transmitting and receiving terminals of the information have encryption and decryption keys, public-key encryption means for encrypting the storage type information by a public-key system in which all the terminals commonly share their own encryption keys, and only a receiving terminal of the information has its own decryption key, and control means for causing said secret-key encryption means to change a common encryption key in each communication, and causing said public-key encryption means to encrypt and transmit the changed key.
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2. A multimedia network system for communicating real-time communication type information and storage type information using at least one transmission path, comprising:
a receiving terminal comprising secret-key decryption means for decrypting the real-time communication type information by a secret-type system in which only transmitting and receiving terminals of the information have encryption and decryption keys, public-key decryption means for decrypting the storage type information by a public-key decryption means for decrypting the storage type information by a public-key system in which all the terminals commonly share their own encryption keys, and only a receiving terminal of the information has its own decryption key, and secret-key control means for causing said secret-key decryption means to change a common decryption key in each communication.
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3. A multimedia network system for transmitting real-time communication type information and storage type information using at least one transmission path, comprising:
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a transmitting terminal comprising secret-key encryption means for encrypting the real-time communication type information by a secret-key system in which only transmitting and receiving terminals of the information have encryption and decryption keys, public-key encryption means for encrypting the storage type information by a public-key system in which all the terminals commonly share their own encryption keys, and only a receiving terminal of the information has its own decryption key, and first control means for causing said secret-key encryption means to change a common encryption key in each communication, and causing said public key encryption means to encrypt and transmit the changed key; and a receiving terminal comprising a secret-key decryption means for decrypting the real-time communication type information by secret-key system in which only transmitting and receiving terminals of the information have encryption and decryption keys, public-key decryption means for decrypting the storage type information by a public-key system in which all the terminals commonly have their own encryption keys, and only a receiving terminal of the information has its own description key, and second control means for causing said secret-key decryption means to change a common decryption key in each communication. - View Dependent Claims (4, 5, 6, 7, 8)
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9. A data communication method for transmitting data from a first terminal to a second terminal, comprising the steps of:
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encrypting data, which is requested for transmission by the second terminal, using a secret-key cryptographic system in the first terminal; transmitting the data encrypted by the secret-key cryptographic system from the first terminal to the second terminal; decrypting the data encrypted by the secret-key cryptographic system and received from the first terminal in the second terminal; encrypting an electronic slip corresponding to the transmission of the data encrypted by the secret-key cryptographic system using a public-key cryptographic system in one of said first and second terminals; sending the electronic slip encrypted by the public-key cryptographic system to the other one of said first and second terminals; and decrypting the encrypted electronic slip in the other one of said first and second terminal. - View Dependent Claims (10, 11, 12, 13)
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14. A data communication method for transmitting data from a first terminal to a second terminal, comprising the steps of:
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encrypting, in the second terminal, a request to the first terminal for data transmission by a public-key cryptographic system; sending the encrypted request from the second terminal to the first terminal; decrypting the encrypted request received from the second terminal in the first terminal; encrypting data corresponding the decrypted request by a secret-key cryptographic system in the first terminal; transmitting the encrypted data from the first terminal to the second terminal; and decrypting the encrypted data received from the first terminal in the second terminal.
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Specification