Authentication system, operation method of authentication system, and operation program of authentication system

An operation method of an authentication system, the operation method being for performing a card issuing task of issuing an ID card of a user and an authentication task of using the ID card to determine whether or not to authenticate the user as a legitimate user, the operation method comprising:

• as the card issuing task,
• acquiring a first facial image of the user;
• extracting first facial feature information from the first facial image;
• generating an authentication code representing the first facial feature information;
• and
• causing a printer to print the authentication code and a display facial image of the user on a card medium to create the ID card, and
• as the authentication task,
• acquiring the authentication code printed on the ID card possessed by the user and a second facial image of the user;
• decoding an identification number and the first facial feature information from the authentication code;
• extracting second facial feature information from the second facial image using the same algorithm as used in a case of extracting the first facial feature information from the first facial image;
• collating the first facial feature information with the second facial feature information;
• and
• performing the determination based on a collation result, the identification number, and an identification number stored in a storage controlled by a second processor.

A non-transitory computer-readable storage medium storing an operation program of an authentication system, the operation program being for performing a card issuing task of issuing an ID card of a user and an authentication task of using the ID card to determine whether or not to authenticate the user as a legitimate user, the operation program causing a computer to execute a process comprising:

• as the card issuing task,
• acquiring a first facial image of the user;
• extracting first facial feature information from the first facial image;
• generating an authentication code representing the first facial feature information;
• and
• causing a printer to print the authentication code and a display facial image of the user on a card medium to create the ID card, and
• as the authentication task,
• acquiring the authentication code printed on the ID card possessed by the user and a second facial image of the user;
• decoding an identification number and the first facial feature information from the authentication code;
• extracting second facial feature information from the second facial image using the same algorithm as used in a case of extracting the first facial feature information from the first facial image;
• collating the first facial feature information with the second facial feature information;
• and
• performing the determination based on a collation result, the identification number, and an identification number stored in a storage controlled by a second processor.