Electrical computers and digital processing systems: multicomput – Computer-to-computer session/connection establishing
Reexamination Certificate
1998-06-30
2001-01-23
Geckil, Mehmet B. (Department: 2756)
Electrical computers and digital processing systems: multicomput
Computer-to-computer session/connection establishing
C709S217000, C709S229000
Reexamination Certificate
active
06178454
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a data communication method of transmitting and receiving data requiring secrecy and data requiring no secrecy, and further relates to a data communication system carrying out such a data communication method.
2. Description of the Related Art
Business transactions are now carried out on open communication networks, such as the Internet, which allow anyone to access it. For such business transactions, data is mainly required, such as data on goods and/or services (hereinafter referred to as “article data” for brevity) to be transmitted by sales companies offering goods and/or services (hereinafter referred to as “articles” for brevity), as well as data transmitted from purchasers buying those articles. Among those data, the article data includes, for example, names, characteristics, functions, prices and so forth of the articles and thus do not require secrecy, or rather, would be preferably delivered to as many people as possible. Therefore, the article data are broadcast to many people from sales companies on the open communication network. On the other hand, the purchaser data includes for example, identities of purchasers, credit card numbers and so forth and thus require secrecy. Thus, the purchaser data are confidentially transmitted to the sales companies from the purchasers concerned on the open communication network. As a typical technique for realizing the confidential communication, encryption of data has been carried out.
On the open communication network, however, even the enciphered data may be subjected to a possibility of surreptitious use by third parties who attempt decryption thereof. Therefore, in the business transactions on the open communication network, it has been difficult to fully avoid leakage to the third parties of the purchaser data which require secrecy.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide an improved a data communication method.
It is another object of the present invention to provide an improved data communication system.
It is another object of the present invention to provide an improved data communication child device connectable to a data communication parent device.
According to one aspect of the present invention, there is provided a data communication method comprising a first step of transmitting and receiving first data via a first communication network; and a second step of transmitting and receiving second data whose secrecy is higher than that of the first data, via a second communication network whose security is higher than that of the first communication network, the second data relating to the first data.
The first step include a step of transmitting and receiving third data via the first communication network, the third data being necessary for carrying out the second step.
The first step may include a step of notifying from a first data communication device to a second data communication device via the first communication network that the first data communication device transmits the second data to the second data communication device via the second communication network, and that the second step includes a step of connecting the first data communication device to the second communication network; a step of connecting the second data communication device to the second communication network; and a step of transmitting the second data from the first data communication device to the second data communication device via the second communication network.
The first step may include a step of requesting from a first data communication device to a second data communication device via the first communication network that the second data communication device transmit the second data to the first data communication device via the second communication network, and that the second step includes a step of connecting the first data communication device to the second communication network; a step of connecting the second data communication device to the second communication network; and a step of transmitting the second data from the second data communication device to the first data communication device via the second communication network.
According to another aspect of the present invention, there is provided a data communication system comprising a first data communication device and a second data communication device which are connectable with each other via either one of a first communication network and a second communication network whose security is higher than that of the first communication network, the first data communication device transmitting first data and the second data communication device transmitting second data relating to the first data and requiring secrecy, wherein the second data communication device comprises a first connection circuit for connection to the first communication network; a reception circuit for receiving the first data from the first data communication device via the first communication network; a second connection circuit for connection to the second communication network; and a transmission circuit for transmitting the second data to the first data communication device via the second communication network.
The first data include third data may which are necessary for the second connection circuit to establish the connection to the second communication network, and the second connection circuit establishes the connection to the second communication network according to the third data.
The data may communication system further comprise a connection switching device for switching the connection of the second data communication device between the first communication network and the second communication network, wherein the second data communication device further comprises a control circuit for producing a switching command to cause the connection switching device to carry out the switching, and the connection switching device carries out the switching according to the switching command.
According to another aspect of the present invention, there is provided a data communication child device which is connectable to a data communication parent device via either one of a first communication network and a second communication network whose security is higher than that of the first communication network, the data communication parent device transmitting first data and receiving second data whose secrecy is higher than that of the first data, the data communication child device comprising a first connection circuit for connection to the first communication network; a reception circuit for receiving the first data from the data communication parent device via the first communication network; a second connection circuit for connection to the second communication network; and a transmission circuit for transmitting the second data to the data communication parent device via the second communication network.
The second connection circuit may carry out the connection to the second communication network after the first connection circuit carries out disconnection from the first communication network.
The first data include third data may which are necessary for the second connection circuit to establish the connection to the second communication network, and the second connection circuit establishes the connection to the second communication network according to the third data.
REFERENCES:
patent: 5727163 (1998-03-01), Bezos
patent: 5826245 (1998-10-01), Sandberg-Diment
patent: 5857014 (1999-01-01), Summer et al.
patent: 5862339 (1999-01-01), Bonnaure et al.
Takeuchi Toshinao
Tsuneyoshi Taiji
Geckil Mehmet B.
Oki Electric Industry Co.
Rabin & Champagne, P.C
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