| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a security token which can detect the illegal update of data other than target data even if the data other than the target data has illegally been updated during updating data of a data object stored in a memory of the security token. <P>SOLUTION: A security token 1 is provided with data update means 10 that, when receiving an instruction to update data included in a data object 11 that is stored in EEPROM104, calculates, before updating the target data, an error detection code that is obtained before the data update from data other than the target data; and after the target data has been updated, verifies the error detection code before the data update, which is calculated from the data other than the target data, against an error detection code after the data update, which is calculated from the data other than the target data. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
