Abstract: According to a method for biometric authentication of a user of a client computing platform, a service-providing system inputs from the client computing platform a candidate vector comprising an encoded, ordered data set that is encrypted using a key generated from a secret entered by the user in the client computing platform. The ordered data set is a digital representation of at least one physical and/or behavioral biometric parameter of the user. Without requiring any knowledge of raw data about the secret or the biometric parameter(s), a comparison value is determined according to a comparison function between the candidate vector and a template vector stored in the service-providing system. When the comparison value meets a predetermined criterion, an authentication message is generated indicating sufficient similarity between the candidate and template vectors.

Abstract: Each of a plurality of clients encodes events as respective vectors and cooperatively choose a joint key. Each client then encrypts its event vector(s) using the joint key to form secret shares of a fixed value and then sends the encoded, encrypted vectors to a service-providing system that selects pairs of the vectors and determines a comparison value from a reconstruction of the secret shares. When the comparison value meets a predetermined criterion, the service-providing system generates a message indicating similarity between the selected pairs of the vectors. The service providing system thus determines a degree of similarity between the events without requiring knowledge of raw data about the events.

Abstract: Each of a plurality of clients encodes events as respective vectors and cooperatively choose a joint key. Each client then encrypts its event vector(s) using the joint key to form secret shares of a fixed value and then sends the encoded, encrypted vectors to a service-providing system that selects pairs of the vectors and determines a comparison value from a reconstruction of the secret shares. When the comparison value meets a predetermined criterion, the service-providing system generates a message indicating similarity between the selected pairs of the vectors. The service providing system thus determines a degree of similarity between the events without requiring knowledge of raw data about the events.