Patent ID: 7284125

Claim:
A generation method for a user authentication device, a first device that sends a first information segment, and that authenticates an identity of a user if an original information can be reconstructed by combining the first information segment received from the first device with a second information segment locally stored at a second device, comprising: forming a printed circuit board having an encryption device that generates both an encryption formula and a decryption formula, and that performs encryption using the encryption formula and decryption using the decryption formula, an encrypted code storage device for storing encrypted code obtained by encrypting original code using the encryption formula generated by the encryption device, and an original code storage device for storing both the decryption formula generated by the encryption device and the original code; cutting the printed circuit board to form a first printed circuit board provided with the encryption device and the original code storage device, and a second printed circuit board provided with the encrypted code storage device; and using the first printed circuit board as the second device and the second printed circuit board as the first device.