To hold security despite the leakage of a password number by using the time information defined between the input of a single character and the input of the next character of the password number as the password information in addition to the password number.
A correct rightful person who is previously notified to input every digit by each character within the on period of an LED 1 puts an IC card into an IC card slot 2 of a keypad 1. Thus, the LED 1 is repetitively turned on and off and the input operations carried out within the an period of the LED 1 are validated. When a password number of four digits is inputted, the light emitting element of the LED 1 lights and a light emitting element A of an LED 2 emits the light in sequence in red, blue and yellow respectively. Thus, the first digit is inputted in the optional one of those said colors. Then the second digit is inputted while the LED 1 lights and the element B lights in sequence in red, blue and yellow respectively. In such a way, four digits are inputted. As a result, the input time interval of every character is fetched as the significant information in addition to the password number and the security is kept for the IC card.
| JP2001014051 | USER AUTHENTICATION DEVICE |
HANDA FUKIO
HAYASHI MASAHIRO
MAKINO HIROSHI
| JPH04235657A | 1992-08-24 | |||
| JPH05257961A | 1993-10-08 | |||
| JPH07160641A | 1995-06-23 |
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