This paper presents a simulation based study of a wireless communication system with the implementation of secured asymmetric RSA cryptographic encryption/decryption algorithm on text message transmission. The system under investigation incorporates 2/3-rated CRC channel coding and QPSK digital modulation over an additive white Gaussian noise (AWGN) channel. For tackling the security problems a text message is first RSA encrypted at the transmitter while it is decrypted at the receiver end and compared for different levels of SNR. | International Journal of Computer Networks and Communications Security C VOL. 2, NO. 5, MAY 2014, 146–151 Available online at: ISSN 2308-9830 N C S Secure Wireless Text Message Transmission with the Implementation of RSA Cryptographic Algorithm Md. Ashraful Islam1, A. Z. M. Touhidul Islam2 1 2 Lecturer, Department of ICE, University of Rajshahi, Rajshahi-6205, Bangladesh Associate Professor, Department of ICE, University of Rajshahi, Rajshahi-6205, Bangladesh E-mail: 1ras5615@, 2touhid_ice@ ABSTRACT Security is crucial to a wide range of wireless data applications and services. This paper presents a simulation based study of a wireless communication system with the implementation of secured asymmetric RSA cryptographic encryption/decryption algorithm on text message transmission. The system under investigation incorporates 2/3-rated CRC channel coding and QPSK digital modulation over an additive white Gaussian noise (AWGN) channel. For tackling the security problems a text message is first RSA encrypted at the transmitter while it is decrypted at the receiver end and compared for different levels of SNR. The Computer simulation has been performed using Matlab 2009b programming language. The transmitted text message is found to have retrieved effectively at the receiver end under the implementation of RSA cryptographic algorithm. It has also been anticipated that the performance of RSA security based wireless communication system degrades with the increase of noise power. Keywords: RSA, AWGN, CRC, QPSK, Test Message. 1 INTRODUCTION Wireless cellular communication has become an important part in our daily life. Besides the large scale adoption of cellular phones for voice communication, it can now also be used to send text messages, access the internet, conduct money transactions and so on. However, for the transmission of such sensitive information over the wireless medium, ensuring security is a critical issue [1,2] .
