A system for verifying a request for access to data is provided, the system comprising a first module and a second module. The first module is arranged to generate a password, and the second module is arranged to receive a password associated with a request for data (received at step), validate the received password, and enable access to the requested data. The system is such that the first and second modules 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 is communicatively disconnected from the second module.