%0 Journal Article
%T CFG-Based Stego-Text Generation Using Template Text and Grammar File<br>利用范本构建语法模板生成仿自然语言隐写文本
%A Su Sheng-jun Lee Wei-Bin Chen Chao Wang Shuo-zhong
%A <br>苏胜君
%A 李维斌
%A 陈超
%A 王朔中
%J 电子与信息学报
%D 2008
%I 
%X A previous text steganography scheme uses the mimic function and the Context-Free Grammar (CFG) to generate pseudo-natural language text to convey secret information. However, the generated text usually lacks semantic consistency and is therefore vulnerable to human evaluation. An improved mimicry technique is proposed that constructs the CFG-based grammar file from a template text that meets certain criteria so that the generated text is semantically consistent. The grammar file is constructed from a replacement text base composed of many optional words, phrases or sentences. Huffman coding is used to take into account the occurrence frequencies of various words, expressions, and syntactic structures to improve naturalness of the generated text. Thus, in addition to machine examination, the obtained stego-text is able to pass stringent human evaluation.
%K Text steganography
%K Mimic function
%K Context Free Grammar (CFG)
%K Semantic consistency<br>文本隐写
%K 模仿函数
%K 上下文无关文法
%K 语义连贯性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=E27E96A5E3CCE92CB7CFA7250D874FF6&yid=67289AFF6305E306&vid=340AC2BF8E7AB4FD&iid=5D311CA918CA9A03&sid=9C05DE753E92F503&eid=C4B945B776D5CA8F&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=13