{"id":914,"date":"2017-11-24T12:49:58","date_gmt":"2017-11-24T05:49:58","guid":{"rendered":"http:\/\/binus.ac.id\/bandung\/?p=914"},"modified":"2021-01-28T19:21:53","modified_gmt":"2021-01-28T12:21:53","slug":"914","status":"publish","type":"post","link":"https:\/\/binus.ac.id\/bandung\/2017\/11\/914\/","title":{"rendered":"How Message Concealing in Modified Graphstega Works"},"content":{"rendered":"<p>In 2008, Desoky proposed a method namely Noiseless Steganography or Nostega that will not produce noise while conducting message camouflaging process. One of the Nostega paradigm is Graphstega that avoids the arousal of suspicion in covert communications by concealing message as data points in a chart [1]. Since the chart as the cover in Graphstega was built by the message, it was not realistic and it would raise suspicion.<\/p>\n<p>To overcome the problem, Sari [2] proposed Modified Graphstega Based on Chart Scale Modification to camouflaged the hidden message into the existing (realistic) chart. This method used Sudoku puzzle for generating shared secret. The architecture of Modified Graphstega Based on Chart Scale Modification is shown in Figure 1.<\/p>\n<p>&nbsp;<\/p>\n<p>Figure 1 Modified Graphstega Architecture<\/p>\n<p>&nbsp;<\/p>\n<p>For instance, the message which will be hidden is \u201cMeet me<br \/>\n@7pm\u201c, and the binary representation based on ASCII code for this message as follows:<\/p>\n<p>010011010110010101100101011101000010000001101101011001010010000001000000001101110111000001101101<\/p>\n<p>and the example of the chart as cover is shown in Figure 2 has taken from legal institution [3]. Assume, all fraction data has been converted to integer.<\/p>\n<p>Figure 2 The cover used for the example<\/p>\n<p>&nbsp;<\/p>\n<p>Furthermore, the scale distance <em>s<\/em> was added to the maximum value of plotted data such that the result can be represented in \u00a0bits. Finally, the scale distance s is added to each value of plotted data. The scale distance <em>s<\/em> transmitted<br \/>\nto the receiver by using private channel. After scale modification process, the modified scale graph is shown in Figure 3. From the scaled chart, the plotted data \u00a0code were 118, 121, 123, 124, 121, 122, 123, 124, 124, 127, 130, and 131.<\/p>\n<p>Figure 3 Scale modification illustration<\/p>\n<p>&nbsp;<\/p>\n<p>Since the maksimum data was 131 which can be represented by 8-bit in binary, then the binary string will be sliced into 8-bit slices as follows:<\/p>\n<p>01001101 01100101 01100101 01110100 00100000<br \/>\n01101101 01100101 00100000 01000000 00110111<br \/>\n01110000 \u00a0\u00a0\u00a0 \u00a001101101<\/p>\n<p>The process is continued by converting each group of sliced bits into decimal (called as message code) as follows: 77 101 101 116 32 109 101 32 64 55<br \/>\n112 109<\/p>\n<p>&nbsp;<\/p>\n<p>Then generate a complete sudoku puzzle as shown in Figure 4<\/p>\n<p>Figure 4 Complete Sudoku puzzle<\/p>\n<p>&nbsp;<\/p>\n<p>The message code (), plotted data code , and complete Sudoku () as shown in Figure 4 is used in this step to yield modulus number () based on this equation<\/p>\n<p>If \u00a0then \u00a0such that \u00a0satisfied this following equation:<\/p>\n<p>If \u00a0then \u00a0was consisted of two tuple\u00a0 \u00a0where<\/p>\n<p>And<\/p>\n<p>The result of generating modulus number is shown in Table I.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Table 1 Result of generating modulus number (x)<\/p>\n<table>\n<tbody>\n<tr>\n<td width=\"75\"><\/td>\n<td width=\"76\"><\/td>\n<td width=\"76\"><\/td>\n<td width=\"113\"><\/td>\n<\/tr>\n<tr>\n<td width=\"75\">118<\/td>\n<td width=\"76\">9<\/td>\n<td width=\"76\">77<\/td>\n<td width=\"113\">551<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">121<\/td>\n<td width=\"76\">6<\/td>\n<td width=\"76\">101<\/td>\n<td width=\"113\">157<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">123<\/td>\n<td width=\"76\">3<\/td>\n<td width=\"76\">101<\/td>\n<td width=\"113\">158<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">124<\/td>\n<td width=\"76\">8<\/td>\n<td width=\"76\">116<\/td>\n<td width=\"113\">140<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">121<\/td>\n<td width=\"76\">5<\/td>\n<td width=\"76\">32<\/td>\n<td width=\"113\">71<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">122<\/td>\n<td width=\"76\">2<\/td>\n<td width=\"76\">109<\/td>\n<td width=\"113\">197<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">123<\/td>\n<td width=\"76\">1<\/td>\n<td width=\"76\">101<\/td>\n<td width=\"113\">(22,28)<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">124<\/td>\n<td width=\"76\">7<\/td>\n<td width=\"76\">32<\/td>\n<td width=\"113\">37<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">124<\/td>\n<td width=\"76\">4<\/td>\n<td width=\"76\">64<\/td>\n<td width=\"113\">68<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">127<\/td>\n<td width=\"76\">1<\/td>\n<td width=\"76\">55<\/td>\n<td width=\"113\">72<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">130<\/td>\n<td width=\"76\">7<\/td>\n<td width=\"76\">112<\/td>\n<td width=\"113\">114<\/td>\n<\/tr>\n<tr>\n<td width=\"75\">131<\/td>\n<td width=\"76\">4<\/td>\n<td width=\"76\">109<\/td>\n<td width=\"113\">146<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>After the sender conducted the concealing process, then the sender should transmit some information to the receiver. During the concealing process, there were informations which should be transmitted using public channel such as chart-cover and evil Sudoku puzzle. Instead of only transmitting information using public channel, there were some informations which should be transmitted using private channel such as scale distance, additional clue and modulus number.<\/p>\n<p>&nbsp;<\/p>\n<p>Reference :<\/p>\n<p>[1] Desoky, A. and Younis, M., <em>Graphstega: graph steganography methodology<\/em>, Journal of Digital Forensic Practice, Taylor &amp; Francis, 2008, 2, page 27-36<\/p>\n<p>[2] Sari, Aprianti Nanda, and Ari Moesriami Barmawi. <em>&#8220;Modified Graphstega Based on Chart Scale Modification.&#8221;<\/em>\u00a0Intelligence and Security Informatics Conference (EISIC), 2016 European. IEEE, 2016.<\/p>\n<p>[3] Central Bureau of Statistics Republic of Indonesia. <em>Persentase Rumah<br \/>\nTangga menurut Provinsi, Daerah Tempat Tinggal, dan Jenis Kelamin<br \/>\nKepala Rumah Tangga, 2009-2013<\/em>, http:\/\/bps.go.id\/linkTabelStatis\/view\/<br \/>\nid\/1604, 2015<\/p>\n<div class=\"binus-gallery row\"><div class=\"gallery-item col-xs-12 col-sm-4 columns-3\"><a href=\"http:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/wqiertiwe6triw.jpg\" data-fancybox=\"images\" data-srcset=\"https:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/wqiertiwe6triw.jpg 576w\" title=\"\" class=\"image-box\"><img decoding=\"async\" src=\"https:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/wqiertiwe6triw.jpg\" alt=\"\"><\/a><\/div><div class=\"gallery-item col-xs-12 col-sm-4 columns-3\"><a href=\"http:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/sjalknfdkjasnf.jpg\" data-fancybox=\"images\" data-srcset=\"https:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/sjalknfdkjasnf.jpg 576w\" title=\"\" class=\"image-box\"><img decoding=\"async\" src=\"https:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/sjalknfdkjasnf.jpg\" alt=\"\"><\/a><\/div><div class=\"gallery-item col-xs-12 col-sm-4 columns-3\"><a href=\"http:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/sdfghjk.jpg\" data-fancybox=\"images\" data-srcset=\"https:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/sdfghjk.jpg 576w\" title=\"\" class=\"image-box\"><img decoding=\"async\" src=\"https:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/sdfghjk.jpg\" alt=\"\"><\/a><\/div><div class=\"gallery-item col-xs-12 col-sm-4 columns-3\"><a href=\"http:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/cxnvmbz.jpg\" data-fancybox=\"images\" data-srcset=\"https:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/cxnvmbz.jpg 576w\" title=\"\" class=\"image-box\"><img decoding=\"async\" src=\"https:\/\/binus.ac.id\/bandung\/wp-content\/uploads\/2017\/11\/cxnvmbz.jpg\" alt=\"\"><\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In 2008, Desoky proposed a method namely Noiseless Steganography or Nostega that will not produce noise while conducting message camouflaging process. One of the Nostega paradigm is Graphstega that avoids the arousal of suspicion in covert communications by concealing message as data points in a chart [1]. Since the chart as the cover in Graphstega [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":920,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46],"tags":[],"class_list":["post-914","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How Message Concealing in Modified Graphstega Works | BINUS UNIVERSITY BANDUNG - Kampus Teknologi Kreatif<\/title>\n<meta name=\"description\" content=\"Learn more how message concealing in modified graphstega works in this article.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/binus.ac.id\/bandung\/2017\/11\/914\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Message Concealing in Modified Graphstega Works | BINUS UNIVERSITY BANDUNG - 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