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The Short Message Service (SMS) is a GSM service to exchange text messages up to 140 byte (or 160 characters of 7 bit). The transmission of mobile-originated short messages is carried out by the short message service Center (SMSC) of the particular network operator. The SMSC is receiving the message from the mobile device And routing it to the destination device. For generating mobile-terminated short messages, it is possible that a Company or a special service provider runs an own SMSC. Thus, a bank could generate SMS from bank data like account balance or account movements and send it to the mobile device of the customer. This technique is used at SMS-banking: The customer sends an SMS with a request to the bank, and gets the desired data as an answer. The customer has to include a PIN for authorization in every SMS he sends to his bank. Alike the WAP banking, one should pay special attention on the security of the location of the SMSC. The operation of SMSC is offered as a service by many service providers. The usage of such a service is out of question for banks, because of the high sensitive character of the transmitted data. For this reason it is mandatory for bank....