A system for verifying a request for access to data is provided, the system comprising a first module 20 and a second module 30. The first module 20 is arranged to generate a password, and the second module 30 is arranged to receive a password associated with a request for data, validate the received password, and enable access to the requested data. The system is such that the first and second modules 20, 30 share a secret that has been uniquely assigned thereto, the shared secret being for use in generation and validation of a said password. Furthermore, the first module 20 is communicatively disconnected from the second module 30.