Method and apparatus for universal and secure access to offered multimedia services over the telephone network

摘要

There is provided a method and a device for universal and secured access to the telephone network and to offer multimedia and operator services, that is used for home banking, for loading of electronic purses, to operator services or for emergency services for medical purposes by means of smart cards. The device or the multimedia device (29) consists essentially of a very small mobile and portable unit with a keyboard (31) with a display (36), with a folding portion (34) with built-in microphone (35) and with a DTMF transmitter (7) and an insertion device (37) for mobile data carrier (1) is equipped. Both the mobile data carrier as well as the multimedia device (29) have their own memory (4 or 10) as well as its own control unit (3 or 8) and one unit or device (2 or 6) for data exchange. The mobile data carrier (1) also has its own cryptographic encryption unit (5). Thus (31) from the input keyboard Digits may be entered that are transferred to a plugged-in mobile data carrier (1). This plug, mobile data carrier (1), such as a smart card or a plug-in smart card is now able to encrypt the said keyboard (31) input data. After encryption, the return of the data to the multimedia device (29) takes place. Immediately thereafter, the data on an integrated DTMF transmitter (7) to the microphone of a telephone handset (32) to be transferred. The operator service (20) responds with a corresponding Kennungston, the received and from the microphone (35) from the multimedia device (29) is evaluated. Immediately thereafter, the central computer (21) prompts the operator service (20) to to identify themselves to the service. The multimedia device (29) is now able to send out after a fixed time after receiving the Kennungstons either the identification information automatically via the DTMF transmitter (7) or the identification information is entered via the keyboard (31) and emitted. Due to the at central computer (21) received identification information, an adjustment is made to the database, which can then assign the corresponding service users. Thereafter, a so-called authentication is performed and that this service the operator (20) sends a random number to the multimedia device (29) is transmitted to the mobile data carrier (1). The mobile data carrier is based on a secret key is able to encrypt the random number. This encrypted random number is then passed to the multimedia device (29) for transmission. The database (23) compares the received encrypted random number with the value stored in the database with the actual value or a value which is calculated by the crypto unit 30. Fig. Thereafter, the user is prompted to enter the destination number of the desired party. If the required number available and not occupied in the network, the communication device (22) to the desired party.