基于雅克比符号的文本信息隐藏  

Text Information Hiding Based on Jacobi Symbol

作　　者：左祥建 杨晓莉[1] 

机构地区：[1]陕西师范大学计算机科学学院,陕西西安710119

出　　处：《计算机技术与发展》2016年第2期73-76,共4页Computer Technology and Development

基　　金：国家中央高校基本科研业务费专项资金项目(GK201504017);包头市科技局项目(2014S2004-2-1-15)

摘　　要：文本信息隐藏是版权维护的一种重要手段。通过轻微缩放字符大小比例来实现信息隐藏的方法鲁棒性差,不能抵抗格式攻击。结合密码学中大整数因子分解困难性假设,提出了基于雅克比符号的改进算法,通过用雅克比符号判断文本载体中的元素是否为二次剩余。若为二次剩余,即雅克比符号为"1",将秘密信息每个字节的ASCII码值,分别替换该字符的缩放比例值;若为非二次剩余,则将文本载体元素的缩放比例保持标准型。该方法能将秘密信息分散到文本载体中。改进后的算法具有更好的隐藏性,提高了抵抗添加和删除攻击的能力,增强了文本信息隐藏的鲁棒性。与传统的文本信息隐藏算法相比具有更好的可靠性,而且算法的实现简单,具有灵活性,可以适用于各种不同语言文本。Text information hiding is an important way of copyright maintenance. Text information hiding algorithms that hide information through slightly zooming in or zooming out the characters are not robust,and nor can they resist reformat attacks. In this paper,based on the assumption that factoring a large integer is hard,propose an improved algorithm which hides or not hides text information by determining whether a number is a quadratic residue module a big integer or not. Judging by Jacobi symbol text vector element is quadratic residue. If a quadratic residue,which Jacobi symbol is ＂ 1＂,the secret information of each byte ASCII code value,scaling values are replaced with the characters. If the non- quadratic residue,scaling text vector elements will keep the standard. This method can disperse into the text secret information carrier. The improved algorithm can better hide text information and can resist adding or deleting attack. It is simple and flexible,and can be applied to different language texts.

关 键 词：文本载体 信息隐藏 雅克比符号 二次剩余 秘密钥 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]