International Journal of Electrical and Computer Engineering (IJECE) Vol. 6, No. 6, December 2016, pp. 2962~2970 ISSN: 2088-8708, DOI: 10.11591/ijece.v6i6.11264  2962 Journal homepage: http://iaesjournal.com/online/index.php/IJECE A Hybrid Cryptographic System for Secured Device to Device Communication A. Rama Krishna 1 , A. S. N. Chakravarthy 2 , A. S. C. S. Sastry 3 1,3 Dept. of ECE, K L University, Guntur A.P., India 2 Dept. of CSE, J N T U. K -UCEV, A.P., India Article Info ABSTRACT Article history: Received May 15, 2016 Revised Oct 15, 2016 Accepted Oct 29, 2016 It is general fact that even after enormous expansion of wireless communication there are still dead regions that hampers the effective communication. With exponential rise in the smart phones, a new layer of communication has evolved that could address the concerns of dead regions and capacity barriers. D2D is the evolving communication technology which focuses on short distance hops between the public devices to reach the destination. The major drawback of this technology is that most of the devices are public hence trustworthiness of the entire channel needs to be addressed in order to make it a viable solution. In this paper, we introduce a novel hybrid cryptographic approach that could address multiple eavesdroppers’ scenario. This approach incorporates both Huffman coding and Binary coding to enhance the crypto benefits for the information transmitted over D2D channel that consists of several public devices. The dual-crypto nature of the proposed algorithm offers higher efficiency, better security and improved key transmission. Thus, the proposed hybrid cryptographic approach is robust in nature while easy and simple to operate. In addition, the proposed approach could recover the original information without any distortion from the encrypted data making the approach lossless in nature. Further simulation results prove that the proposed offers confidentiality to the transmitted to data while addressing the network capacity crunch. Keyword: Binary coding Cryptography D2D communication Huffman coding Wireless communication Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. Corresponding Author: A. Rama Krishna, Department of Electronics and Communication Engineering, K L University, Vaddeswaram, Guntur, A.P, 522502, India. Email: ramakrishna.a@kluniversity.in 1. INTRODUCTION In this digital era, wireless has become the major backdrop for cheap and high speed data transfer and several advance technologies are constantly evolving that are ensure wireless approachwould be the primary communication channel. It is evident that to ensure an effective communication channel that is capable of transferring significantamount of data between two authorized personnel requires a wide spread infrastructure [1]. With the advancements in the technology the corresponding requirement of the communication channel varies significantly. For example, smaller packets drop with more coverage for transmission, high data rates, secured and robust communication to name few [2]. The major drawback of the existing communication channels are complex network architecture and high power requirement for processing and transmission of the data packets. Thus to effective address the above concerns of the existing wireless networks, a novel open-public channel is require that offers significantly high number of possible paths and energy at each node but requires low energy for transmission. Since, device-to-device (D2D) communication is independent of existing