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V視覺判斷:將每位元抓出來,檢視是否是一張亂的圖,若是,則視為有隱藏資訊。 統計法:取100張沒做隱藏的圖,檢視Cr與Co值的差,再將這100張圖做隱藏動作,隱藏後檢視Cr與Co的差值,若超過某個值,則視為有隱藏資訊。 12288; 上週的課程是如何判斷一張圖中,是否暗藏資訊?首先我和可欣分別用不同的影像處理軟體,製作1*1的黑色小方塊,再用S-Tools將小黑塊藏到較大的圖片中,最後丟入老師給予的顏色分析程式,看看隱藏後剩下多少種顏色,測試是否可以從顏色數量去判斷。 12288; 測試結果,答案是否定的。因為GIF是用調色盤繪製的圖片,不同的軟體選用的調色盤也不相同,同樣是1*1的圖,photoshop可能選用4色的調色盤,小畫家可能選256色的調色盤,使得檔案大小不同,隱藏所需要的空間便會不同,所以無法隱藏後的顏色種類去判斷。 S-Tools is offered for Windows and can provide hiding techniques in BMP, GIF and WAV file formats. This tool seems to be quite versati...

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小華Blogger | limis300gt.blogspot.com Reviews
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V視覺判斷:將每位元抓出來,檢視是否是一張亂的圖,若是,則視為有隱藏資訊。 統計法:取100張沒做隱藏的圖,檢視Cr與Co值的差,再將這100張圖做隱藏動作,隱藏後檢視Cr與Co的差值,若超過某個值,則視為有隱藏資訊。 12288; 上週的課程是如何判斷一張圖中,是否暗藏資訊?首先我和可欣分別用不同的影像處理軟體,製作1*1的黑色小方塊,再用S-Tools將小黑塊藏到較大的圖片中,最後丟入老師給予的顏色分析程式,看看隱藏後剩下多少種顏色,測試是否可以從顏色數量去判斷。 12288; 測試結果,答案是否定的。因為GIF是用調色盤繪製的圖片,不同的軟體選用的調色盤也不相同,同樣是1*1的圖,photoshop可能選用4色的調色盤,小畫家可能選256色的調色盤,使得檔案大小不同,隱藏所需要的空間便會不同,所以無法隱藏後的顏色種類去判斷。 S-Tools is offered for Windows and can provide hiding techniques in BMP, GIF and WAV file formats. This tool seems to be quite versati...
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1 小華blogger
2 課程紀錄
3 week2:使用s tools
4 week3:如何破解stools
5 week4:破解s tools的方法
6 week5:
7 1破解s tools的方法
8 2如何判斷一張圖是亂的
9 張貼者:
10 王小華blogger
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小華blogger,課程紀錄,week2:使用s tools,week3:如何破解stools,week4:破解s tools的方法,week5:,1破解s tools的方法,2如何判斷一張圖是亂的,張貼者:,王小華blogger,沒有留言,如何知道圖片中暗藏玄機,play s tools,開課嘍!xd,網誌存檔,關於我自己,檢視我的完整簡介
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小華Blogger | limis300gt.blogspot.com Reviews

https://limis300gt.blogspot.com

V視覺判斷:將每位元抓出來,檢視是否是一張亂的圖,若是,則視為有隱藏資訊。 統計法:取100張沒做隱藏的圖,檢視Cr與Co值的差,再將這100張圖做隱藏動作,隱藏後檢視Cr與Co的差值,若超過某個值,則視為有隱藏資訊。 12288; 上週的課程是如何判斷一張圖中,是否暗藏資訊?首先我和可欣分別用不同的影像處理軟體,製作1*1的黑色小方塊,再用S-Tools將小黑塊藏到較大的圖片中,最後丟入老師給予的顏色分析程式,看看隱藏後剩下多少種顏色,測試是否可以從顏色數量去判斷。 12288; 測試結果,答案是否定的。因為GIF是用調色盤繪製的圖片,不同的軟體選用的調色盤也不相同,同樣是1*1的圖,photoshop可能選用4色的調色盤,小畫家可能選256色的調色盤,使得檔案大小不同,隱藏所需要的空間便會不同,所以無法隱藏後的顏色種類去判斷。 S-Tools is offered for Windows and can provide hiding techniques in BMP, GIF and WAV file formats. This tool seems to be quite versati...

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小華Blogger: 07/03/01資訊隱藏課程紀錄

http://limis300gt.blogspot.com/2007/02/070301.html

Information hiding techniques for steganography and digital watermarking. Http:/ www.jjtc.com/pub/book99 ih.htm. Information HidingSteganography and Watermarking -Attacks and Countermeasures. Http:/ www.jjtc.com/pub/book2000 ih.htm. Information Hiding Laboratory WebMark Applaction. Http:/ www.ihl.ucd.ie/webmark/demo.html. 訂閱: 張貼留言 (Atom).

2

小華Blogger: Play S-Tools

http://limis300gt.blogspot.com/2007/03/play-s-tools.html

12288; 上次上課說到GIF的格式,GIF是將圖片中的顏色做分群,分成256種顏色,檔案中便可只紀錄是第幾號顏色,達到壓縮的目的。S-Tools使用的隱藏技術是將想隱藏的資訊,放在每個像素RGB的最後一位元。如果使用256色去做隱藏的動作,每個像素可能會多出2*2*2=8倍的顏色,超出256色的限制,所以S-Tools是將影像先降成32色,延伸後便是256色,但是這個方法會使圖片失真嚴重。下面是一張隱藏前後的比較圖。 訂閱: 張貼留言 (Atom).

3

小華Blogger: 如何知道圖片中暗藏玄機

http://limis300gt.blogspot.com/2007/03/blog-post.html

12288; 上週的課程是如何判斷一張圖中,是否暗藏資訊?首先我和可欣分別用不同的影像處理軟體,製作1*1的黑色小方塊,再用S-Tools將小黑塊藏到較大的圖片中,最後丟入老師給予的顏色分析程式,看看隱藏後剩下多少種顏色,測試是否可以從顏色數量去判斷。 12288; 測試結果,答案是否定的。因為GIF是用調色盤繪製的圖片,不同的軟體選用的調色盤也不相同,同樣是1*1的圖,photoshop可能選用4色的調色盤,小畫家可能選256色的調色盤,使得檔案大小不同,隱藏所需要的空間便會不同,所以無法隱藏後的顏色種類去判斷。 12288; 我覺得要破解隱藏在圖片中的資訊相當困難,即使使用暴力法也不一定能百分之百破解。何未暴力法?就是使用所有可能的隱藏方式去破解,例如某張圖可能使用LSB的方式,那便將最後一位原取出,看看使否能湊出有用的資訊。破解比隱藏更加困難。 訂閱: 張貼留言 (Atom).

4

小華Blogger: 二月 2007

http://limis300gt.blogspot.com/2007_02_01_archive.html

Information hiding techniques for steganography and digital watermarking. Http:/ www.jjtc.com/pub/book99 ih.htm. Information HidingSteganography and Watermarking -Attacks and Countermeasures. Http:/ www.jjtc.com/pub/book2000 ih.htm. Information Hiding Laboratory WebMark Applaction. Http:/ www.ihl.ucd.ie/webmark/demo.html. 訂閱: 文章 (Atom).

5

小華Blogger: 課程紀錄

http://limis300gt.blogspot.com/2007/03/blog-post_28.html

V視覺判斷:將每位元抓出來,檢視是否是一張亂的圖,若是,則視為有隱藏資訊。 統計法:取100張沒做隱藏的圖,檢視Cr與Co值的差,再將這100張圖做隱藏動作,隱藏後檢視Cr與Co的差值,若超過某個值,則視為有隱藏資訊。 訂閱: 張貼留言 (Atom).

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Information Hiding Class: 二月 2007

http://ihc-yklee.blogspot.com/2007_02_01_archive.html

INFORMATION HIDING techniques for steganography and digital watermarking. Fabien A. P. Petitcolas. ARTECH HOUSE, Computer Security Series. Available on Amazon.com. This book surveys recent research results in the fields of watermarking and steganography, two disciplines generally referred to as information hiding. Included are chapters about the following topics:. Chapter 1: Introduction to information hiding. Chapter 2: Principles of steganography. Chapter 3: A survey of steganographic techniques. Chapt...

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V視覺判斷:將每位元抓出來,檢視是否是一張亂的圖,若是,則視為有隱藏資訊。 統計法:取100張沒做隱藏的圖,檢視Cr與Co值的差,再將這100張圖做隱藏動作,隱藏後檢視Cr與Co的差值,若超過某個值,則視為有隱藏資訊。 12288; 上週的課程是如何判斷一張圖中,是否暗藏資訊?首先我和可欣分別用不同的影像處理軟體,製作1*1的黑色小方塊,再用S-Tools將小黑塊藏到較大的圖片中,最後丟入老師給予的顏色分析程式,看看隱藏後剩下多少種顏色,測試是否可以從顏色數量去判斷。 12288; 測試結果,答案是否定的。因為GIF是用調色盤繪製的圖片,不同的軟體選用的調色盤也不相同,同樣是1*1的圖,photoshop可能選用4色的調色盤,小畫家可能選256色的調色盤,使得檔案大小不同,隱藏所需要的空間便會不同,所以無法隱藏後的顏色種類去判斷。 S-Tools is offered for Windows and can provide hiding techniques in BMP, GIF and WAV file formats. This tool seems to be quite versati...

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