Secure SMS Communication Using Encryption Gateway and Digital Signature

GSM Networks were initially designed for communication purpose and security aspect was not covered in the system, but now different systems are using diverse encryption techniques to protect the SMS text from unwanted receivers. Most of work has been done in GSM to secure message from person who can eavesdrop the GSM Channel, from the hacker who can perform replay attacked using his historical messages and from the hacker who can disclose the message secrecy. Eavesdropping in a radio channel is easy but due to a lot of traffic there is a very less chances to find the correct information and the desired SMS however in today´s GSM system still have two problems. The easiest way to read the text message from any person is the mobile operator network entities so there is a need to make it possible that our sent SMS is not in the format that should be easily read, so Protection of message text, its readability at operators end at different network entities like, SMSC, MSC and Lawful Interception System, and the second problem is message non-repudiation, this term is used for the behavior of an attacker such that it impersonates as some other genuine user. Because in today´s network it is possible that at operator end messages can be sent using any sender number and receiver cannot confirm that this message is generated from the specified number or from any other network operator.