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1 3-8 Information Hiding on Digital Documents by Adjustment of New-line Positions TAKIZAWA Osamu, MATSUMOTO Tsutomu, NAKAGAWA Hiroshi, MURASE Ichiro, and MAKINO Kyoko In the usual information hiding applied to digital documents, secret messages are embedded in the layout information e.g., the space between lines or characters because character codes have no redundancy. This paper describes a new method for hiding information in plain text without using any layout information. It enables a secret message to be embedded as binary digits that are related to the number of characters in each line of the cover text. Information hiding, Digital watermarking, Steganography, Document, Natural language processing 153

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13 特 集 図12a 実験シート例 シート番号 1 一般ニュース 図12b 実験シート例 シート番号 6 子供向け文学 情 報 漏 え い 対 策 技 術 改 行 位 置 の 調 整 に よ る ド キ ュ メ ン ト へ の 情 報 ハ イ デ ィ ン グ 165

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16 R.J.Anderson and F.A.P.Petitcolas, "Information Hiding-An Annotated Bibliography"

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189 2015 1 80

189 2015 1 80 189 2015 1 A Design and Implementation of the Digital Annotation Basis on an Image Resource for a Touch Operation TSUDA Mitsuhiro 79 189 2015 1 80 81 189 2015 1 82 83 189 2015 1 84 85 189 2015 1 86 87

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