Methods, user devices, access control equipments, computer software, computer program products and systems for facilitating authentication or access control

摘要

A user device 110 facilitates authentication relating to a user of a further user device 120. The user device 110 receives first and second input data and processes the second input data using a second data processing element 220 located in the user device 110 to obtain processed second input data. The first input data is obtained by the further user device 120 using a first data processing element 230 located in the further user device 120. The user device 110 performs an authentication response operation to derive authentication response data. The operation has as inputs the first input data, the processed second input data and data indicative of a result of an authentication decision made by a user of the user device 110. The user device 110 outputs the authentication response data to enable access control equipment 130 to perform an access control operation.