| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an ID tag, a tag reader, an ID tag security system and a method for transmitting and restoring the ID tag by which an unauthorized tag to pretend a normal tag is distinguished. <P>SOLUTION: The ID tag performs non-contact transmission of tag ID information of itself and is constituted of an ID output means for outputting the stored tag ID information, an ID hiding means for hiding the tag ID information based on a value dependent on time and outputting a hidden ID, a time information hiding means for hiding time information based on a stored tag unique value and outputting the hidden time information and a data output means for receiving the hidden ID and the hidden time information and outputting data obtained by combining them. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
