Communication system and authentication card

1. An authentication method comprising the steps of:

storing a plurality of correspondence tables in a semiconductor device, the semiconductor device comprising a sensor;

forming a reference password by converting biometrics of an authorized user using one of the plurality of correspondence tables;

storing the reference password in the semiconductor device;

reading biometrics of a user of the semiconductor device by the sensor;

forming a password by converting the biometrics of the user using the one of the plurality of correspondence tables; and

checking the password against the reference password,

wherein the semiconductor device and the user are authenticated if the password and the reference password match in the checking step,

wherein each correspondence table of the plurality of correspondence tables can be used to form a distinct password by converting the biometrics of the user, and

wherein the one of the plurality of correspondence tables stored in the semiconductor device can be changed for another correspondence table of the plurality of correspondence tables.

2. The authentication method according to claim 1 , wherein the sensor is a fingerprint reading sensor.

3. The authentication method according to claim 1 , wherein the sensor comprises a light source using organic light-emitting element and an imaging element.

4. The authentication method according to claim 1 , wherein the biometrics of the user is obtained from a finger or a hand.

5. The authentication method according to claim 1 , the semiconductor device further comprising:

an antenna over a substrate;

a nonvolatile memory device over the substrate; and

a CPU over the substrate.

6. The authentication method according to claim 5 , wherein the substrate is a flexible substrate.

7. An authentication method comprising the steps of:

storing a plurality of correspondence tables in a semiconductor device, the semiconductor device comprising a sensor;

forming a reference password by converting biometrics of an authorized user using one of the plurality of correspondence tables;

storing the reference password in the semiconductor device;

reading biometrics of a user of the semiconductor device by the sensor;

forming a password by converting the biometrics of the user using the one of the plurality of correspondence tables;

checking the password against the reference password; and

transmitting authentication data of the user to a terminal if the password and the reference password match in the checking step,

wherein each correspondence table of the plurality of correspondence tables can be used to form a distinct password by converting the biometrics of the user, and

wherein the one of the plurality of correspondence tables stored in the semiconductor device can be changed for another correspondence table of the plurality of correspondence tables.

8. The authentication method according to claim 7 , wherein the sensor is a fingerprint reading sensor.

9. The authentication method according to claim 7 , wherein the sensor comprises a light source using organic light-emitting element and an imaging element.

10. The authentication method according to claim 7 , wherein the biometrics of the user is obtained from a finger or a hand.

11. The authentication method according to claim 7 , the semiconductor device further comprising:

an antenna over a substrate;

a nonvolatile memory device over the substrate; and

a CPU over the substrate.

12. The authentication method according to claim 11 , wherein the substrate is a flexible substrate.

13. An authentication method comprising the steps of:

registering an authorized user, the registering step comprising the steps of:

storing a plurality of correspondence tables in a semiconductor device, the semiconductor device comprising a sensor;

forming a reference password by converting biometrics of the authorized user using one of the plurality of correspondence tables; and

storing the reference password in the semiconductor device,

authenticating a user of the semiconductor device, the authenticating step comprising the steps of:

reading biometrics of the user of the semiconductor device by the sensor;

forming a password by converting the biometrics of the user using the one of the plurality of correspondence tables;

checking the password against the reference password;

transmitting an authentication-complete signal to a management server if the password and the reference password match in the checking step; and

transmitting an authentication-incomplete signal to the management server if the password and the reference password do not match in the checking step,

wherein each correspondence table of the plurality of correspondence tables can be used to form a distinct password by converting the biometrics of the user, and

wherein the one of the plurality of correspondence tables stored in the semiconductor device can be changed for another correspondence table of the plurality of correspondence tables.

14. The authentication method according to claim 13 , wherein the sensor is a fingerprint reading sensor.

15. The authentication method according to claim 13 , wherein the sensor comprises a light source using organic light-emitting element and an imaging element.

16. The authentication method according to claim 13 , wherein the biometrics of the user is obtained from a finger or a hand.

17. The authentication method according to claim 13 , the semiconductor device further comprising:

an antenna over a substrate;

a nonvolatile memory device over the substrate; and

a CPU over the substrate.

18. The authentication method according to claim 17 , wherein the substrate is a flexible substrate.