3. The method of claim 2 wherein: the random number is an N digit number in base X, each digit ranging between 0 and X−1; the plurality is equal to N; and for each face image of the set of face images, creating the face image with the facial expression score derived from the random number for the corresponding emotion from the random set of emotions includes, for each integer, i, from 1 to N, creating an i-th face image of the set of face images, the i-th face image having a facial expression score for an i-th emotion of the set of emotions equal to the i-th digit of the random number.
5. The method of claim 3 wherein: the computing device is an automated teller machine (ATM) having an embedded display screen and an embedded keypad; displaying each face image of the set of face images to the user includes displaying each face image to the user on the embedded display screen of the ATM; receiving the user score for each face image includes receiving the user score from the user for each face image via the user hitting a key of the embedded keypad of the ATM corresponding to a value in the range of 0 to X−1; and providing access to the protected resource includes providing the user with access to a bank account of the user.