| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enable the transmission of data in anonymous communication via a route including a relay server appointed by a user, and facilitate the detection of illegal process of the data on the anonymous communication route. <P>SOLUTION: Relay servers M<SB>i</SB>register secret information (a<SB>i</SB>, b<SB>i</SB>) separately to a plurality of third party institutions TP<SB>k</SB>, and open information (h<SB>i</SB>, z<SB>i</SB>) corresponding to the secret information to the public. A user U<SB>j</SB>creates key creating information G<SB>o</SB>,<SB>j</SB>out of user's secret information r<SB>j</SB>, sequentially multiple-codes a plain sentence msg<SB>j</SB>to be anonymously transmitted, using the open information (h<SB>i</SB>, z<SB>i</SB>) of selected each server, and transmit the obtained codes E<SB>o</SB>,<SB>j</SB>, together with verifying data u<SB>i</SB>,<SB>j</SB>and the key creating information G<SB>o</SB>,<SB>j</SB>, to the next server, which verifies received data C<SB>i-1, j</SB>using a verifying key Z'<SB>i</SB>,<SB>j</SB>created from the key creating information. When a illegal data process is found, it is reported to the third party institutions, which cooperate to verify the received data of each server M<SB>i</SB>, using the secret information (a<SB>i</SB>, b<SB>i</SB>), to identify an unauthorized person. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
