Smart card based system for telephone-securized transactions

Claim 1

A smart card based system for telephone-securized transactions comprising: a telephone terminal comprising, a loudspeaker, and a transmitter, said telephone terminal being connected to a server by way of a telephone network; a smart card configured to calculate security parameters using a security function operation mechanism stored therein; and a portable securing device configured to connect to the smart card and to secure a transaction between a user of the portable securing device and the server by performing a bidirection information exchange operation between the server and the smart card, said portable securing device comprising, a keypad, a display, an internal sound signal transmitter that is configured to produce acoustic energy therefrom that is directly received by said transmitter of said telephone terminal; a bus configured to couple the smart card to the keypad, the display, and the internal sound signal transmitter, wherein, said information exchange operation using a communications channel from said server to said smart card comprising, a link between said server and said loudspeaker where said server produces voice signals indicative of data produced at said loudspeaker and recognizable by said user, and a link between said user and said keypad where said user enters said data on said keypad in response to said data being produced at said loudspeaker, said keypad passing said data via said bus to said smart card, and said information exchange operation using another communications channel from said smart card to said server comprising, a link between said internal sound signal transmitter and said transmitter of said telephone terminal, and a link between said telephone terminal and said server.