| 摘要 |
All conceivable problems associated with user authentication can be coped with at least individually by preventing spoofing as the result of leakage of authentication information through interception of communications, monitoring, stealthy glance, brute-force attack, and beyond the control of the user and outside the system, duplication and forgery of authentication information by carrying out an "authentication method that can cope with every possible problem in relation to authentication, excluding monitoring" and an "authentication method authentication having the possibility of spoofing by the authenticating side though there is no danger of monitoring and he possibility of spoofing as the result of theft of authentication information from the authentication device" in two stages in one user authentication processing, and "preventing spoofing by the authenticating side and as the result of theft of authentication information from the authentication device by establishing a collatable and irreversible relationship between the authentication information issued by the user and the authentication information registered in the authentication device" in the latter authentication method.
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