1. A method performed by a computing device of providing access to a protected resource, the method comprising: receiving, by the computing device, an authentication request from a user seeking access to the protected resource; in response to receiving the authentication request, generating a set of one or more face images, each face image of the set of face images having a facial expression score for a particular emotion associated with that face image, the facial expression scores being specific to the user; displaying each face image of the set of face images to the user together with a request for the user to score that face image for the particular emotion associated with that face image; in response to displaying each face image, receiving a user score for that face image; comparing the received user score for each face image of the set of face images to the respective facial expression score for the particular emotion associated with that face image, yielding a set of comparison results; and selectively providing access to the protected resource in response to each of the comparison results being affirmative.
1. A method performed by a computing device of providing access to a protected resource, the method comprising: receiving, by the computing device, an authentication request from a user seeking access to the protected resource; in response to receiving the authentication request, generating a set of one or more face images, each face image of the set of face images having a facial expression score for a particular emotion associated with that face image, the facial expression scores being specific to the user; displaying each face image of the set of face images to the user together with a request for the user to score that face image for the particular emotion associated with that face image; in response to displaying each face image, receiving a user score for that face image; comparing the received user score for each face image of the set of face images to the respective facial expression score for the particular emotion associated with that face image, yielding a set of comparison results; and selectively providing access to the protected resource in response to each of the comparison results being affirmative. 2. The method of claim 1 wherein: the set of face images includes a plurality of face images; and generating the set of one or more face images includes: selecting a random number and a random set of emotions, the random set of emotions having the plurality of elements; and creating each face image of the set of face images includes, for each face image of the set of face images, creating the face image with a facial expression score derived from the random number for a corresponding emotion from the random set of emotions.