An Encryption Protocol for End-to-end Secure Transmission of SMS

Short Message Service (SMS) is a process of transmission of short messages over the network. SMS is used in daily life applications including mobile commerce, mobile banking, and so on. It is a robust communication channel to transmit information. SMS pursue a store and forward way of transmitting messages. The private information like passwords, account number, passport number, and license number are also send through message. The traditional messaging service does not provide security to the message since the information contained in the SMS transmits as plain text from one mobile phone to other. This paper explains an efficient encryption protocol for securely transmitting the confidential SMS from one mobile user to other which serves the cryptographic goals like confidentiality, authentication and integrity to the messages. The Blowfish encryption algorithm gives confidentiality to the message, the EasySMS protocol is used to gain authentication and MD5 hashing algorithm helps to achieve integrity of the messages. Blowfish algorithm utilizes only less battery power when compared to other encryption algorithms. The protocol prevents various attacks, including SMS disclosure, replay attack, man-inthe middle attack and over the air modification.