Authentication system, authentication terminal, user terminal, authentication method, and program

An authentication method, comprising:

• performing authentication of a user in a vicinity of an authentication terminal based on first authentication information acquired by using an authentication terminal and second authentication information registered in a storage in association with identification information on the user, wherein performing authentication includes calculating a feature amount of the user's face, the feature amount indicates features such as a relative position, size, or shape of a facial part, the first authentication information is the feature amount acquired by using the authentication terminal, and the second authentication information is the feature amount registered in the storage in association with the identification information on the user;
• determining, when there are the user and another user who is different from the user in the vicinity of the authentication terminal, a possibility of the user being authenticated as the another user, by comparing the second authentication information of the user and the second authentication information of the another user;
• and
• prevent the execution of the authentication when the authentication method determines that there is the possibility.

An authentication system, comprising at least one memory configured to store computer program code;

• and
• at least one processor configured to operate as instructed by the computer program code, the computer program code including:
• first authentication code configured to cause the at least one processor to perform authentication of a user in a vicinity of an authentication terminal based on first authentication information acquired by using the authentication terminal and second authentication information registered in a storage in association with identification information on the user, wherein performing authentication includes calculating a feature amount of the user's face, the feature amount indicates features including a relative position, size, or shape of a facial part, the first authentication information is the feature amount acquired by using the authentication terminal, and the second authentication information is the feature amount registered in the storage in association with the identification information on the user;
• determining code configured to cause the at least one processor to determine, when there are the user and another user who is different from the user in the vicinity of the authentication terminal, a possibility of the user being authenticated as the another user, by comparing the first authentication information of the user and the first authentication information of the another user;
• and
• second authentication code configured to cause the at least one processor to prevent the execution of the first authentication code, when the determining code determines that there is the possibility.

An authentication method, comprising:

• performing authentication of a user in a vicinity of an authentication terminal based on first authentication information acquired by using an authentication terminal and second authentication information registered in a storage in association with identification information on the user, wherein performing authentication includes calculating a feature amount of the user's face, the feature amount indicates features including a relative position, size, or shape of a facial part, the first authentication information is the feature amount acquired by using the authentication terminal, and the second authentication information is the feature amount registered in the storage in association with the identification information on the user;
• determining, when there are the user and another user who is different from the user in the vicinity of the authentication terminal, a possibility of the user being authenticated as the another user, by comparing the first authentication information of the user and the first authentication information of the another user;
• and
• prevent the execution of the authentication when the authentication method determines that there is the possibility.