| 摘要 |
PURPOSE:To keep secret even if a password is leaked to the others, by collating the preliminarily registered password consisting of plural digits and intervals of input time of respective digits as parameters to increase the number of combinations of the password. CONSTITUTION:Intervals of input time of respective digits of the password consisting of plural digits inputted from a peripheral device 3 are counted by a time counter 3. Preliminarily determined intervals of input time of respective digits of the password consisting of plural prescribed digits are registered in a register file 5 with an allowable time width. A collating part 6 collates not only the password consisting of plural digits inputted from the peripheral device 3 but also intervals of input time of respective digits with preliminarily determined intervals of input time of respective digits. Since intervals of input time of the password are used as parameters, intervals of input time are on the outside of the input allowable range as the collation result and coincidence is not attained though the others obtains and uses the password, thus keeping the secret. |
