| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an authentication technology for reducing a comparison load at a server side while preventing an ID from being traced based on transmitting and receiving data. <P>SOLUTION: A load of a server is considerably reduced in authentication so that data (variable ID, random numbers, and hash value for comparison) transmitted to the server by a tag are grouped and the fixed ID of the tag is retrieved from a database by using the variable ID as a retrieval key. Further, the tag stores a tag unique key, and trace difficulty of the ID can be achieved since the variable ID is updated by using the tag unique key in every response to an ID acquisition demand. <P>COPYRIGHT: (C)2007,JPO&INPIT |
