| 摘要 |
PROBLEM TO BE SOLVED: To enhance the security against attach taking advantage of a failure of the IC card that conducts signature generating processing at a high speed by using the Chinese remainder theorem. SOLUTION: The power remainder calculation generating a digital signature M is processed at a high speed with the Chinese remainder theorem by using a prime factor to modulus (n), and an error check code for data generated in the calculation process of the Chinese remainder theorem together with the data themselves are calculated and stored simultaneously. In the case of the digital signature M, the error check code of the data is again calculated, the stored error check code is collated to detect an error of the data and an error status is returned when the error is detected. |
