| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a remote education system in which there is little possibility that an encryption key is obtained by a third person and the encryption key which does not have to be managed by a user is exchanged and which is excellent in secrecy in a remote education system utilizing a communication satellite. <P>SOLUTION: In this remote education system in which interactive information transmission is performed by the communication satellite and a ground network between a transmission center having an information transmission function to the communication satellite and an information reception function from the ground network and a plurality of participant classrooms having an information transmission function to the ground network and an information reception function from the communication satellite, a cryptographic key is transmitted from the transmission center to the participant classrooms, first information processors that the participant classrooms have use the cryptographic key to encipher digital data to be enciphered digital data, the enciphered digital data are transmitted from the participant classrooms to the transmission center and a second information processor that the transmission center has decodes the enciphered digital data with a decoding key corresponding to the cryptographic key. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
