Authors: Gandharba Swain; Saroj Kumar Lenka
Addresses: CSE Department, SOA University, Bhubaneswar 751030, Odisha, India; IT Department, GMR Institute of Technology, Rajam, Andhra Pradesh, India ' CSE Department, MITS University, Lakshmangarh 332311, Rajasthan, India
Abstract: In this paper a new steganographic technique based on LSB array is proposed. Four LSB arrays such as LSB0, LSB1, LSB2 and LSB3 are defined. One of the four arrays is opted and formed depending upon the length of the secret message. For longer messages LSB3 array can be chosen. The different words of the secret message are mapped on the chosen array, where maximum match occurs, there steganographed and start indices are noted down. Once a word is embedded in a portion of the array, that portion is made unavailable for subsequent words. The length of each word and their start indices altogether are encrypted by RSA algorithm. The cipher text obtained is compressed and then embedded at some reserved location in the image. This reserved location was not used in forming the used LSB array. The experimental results confirm the strength of this technique.
Keywords: steganography; word mapping; least significant bit; LSB arrays; secret information; information security; encryption; cipher text.
International Journal of Signal and Imaging Systems Engineering, 2015 Vol.8 No.1/2, pp.115 - 122
Received: 22 Sep 2011
Accepted: 06 Aug 2012
Published online: 19 Jan 2015 *