Abstract: A method for using multiple channels to access a resource, wherein an authenticated user requests a resource that requires a second authentication parameter over a first channel, a token value is transmitted to the user on the first channel, and the user transmits the token value and a second authentication parameter over a second channel. The token value is used to associate the first authentication parameter to the second authentication parameter, whereby the user is allowed access to the resource on the first or second channel.

Abstract: A sound reproduction device or a microphone comprising an enclosure (2) which is made of a substantially gas permeable flexible material and an electrical transducer (1) having at least one connection (4, 5) with the enclosure, and usually two connections, to impart movement to the enclosure where the device acts as a loudspeaker or to receive movement of the enclosure to generate an electrical signal where the device acts as a microphone. The enclosure is adapted to be stressed by internal pressure and forms a concavity centered on at least one of the connections with the electrical transducer, which concavity acts as an acoustic diaphragm.