A method of authentication using an electronic device (20), comprising: providing a computer (22, 24, 26, 28, 140) having a sound receiving (28) and generating sub-system including a microphone (26); providing a personal communicator (30, 144) which utilizes a communication network (148); initiating a connection by the computer (22, 24, 26, 28, 140), over the communications network (148), to the personal communicator (30, 144) and identifying the personal communicator (30, 144) responsive to an audio response of the personal communicator (30, 144) to the connection initiation. Preferably, the personal communicator (30, 144) is a cellular telephone.