Sunday, April 22, 2007

Null Cipher in Chinese Medicine History

From StegoRN

上個星期逛台北捷運的地下書街, 看到了這本《中醫藥典故與傳說》, 第七章的醫家軼聞, 我首先閱讀了我較為熟悉的醫聖張仲景部份, 其中有一個故事就是張仲景利用 Null Cipher 這樣的技術巧戲庸官, 故事中的方子如下:

柏子仁三錢
木瓜二錢
官桂二錢
柴胡三錢
益智二錢
附子二錢
八角二錢
人蔘一錢
台烏三錢
上党三錢
山藥二錢

Thursday, March 08, 2007

S-Tools

Author: Andy Brown
Ver. 1.0 (1994), Ver. 2.0 (1994), Ver. 3.0 (1995), Ver. 4.0 (1996)

最早接觸到 S-Tools 這個隱藏軟體是從 Neil F. Johnson 1998 February 發表在 IEEE Computer 的文章 "Steganography: Seeing the Unseen", 文章中所使用的例子是將 CORONA 偵查衛星於1966/08/20 所拍攝的前蘇聯哈薩克戰略轟炸機基地空照圖 (Soviet strategic bomber base) 隱藏到印象派大師 Pierre-Auguste Renoir (1841-1919) 的畫作 Le Moulin de la Galette (1876) 之中, 讓我印象深刻。

Sunday, March 04, 2007

Book: INFORMATION HIDING techniques for steganography and digital watermarking

From StegoRN

Editors: Stefan Katzenbeisser & Fabien A. P. Petitcolas
ARTECH HOUSE, Computer Security Series
ISBN 1-58053-035-4
(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
(Fabien A. P. Petitcolas) gives an introduction to the field of information hiding, thereby discussing the history of steganography and watermarking and possible applications to modern communication systems.
* Chapter 2: Principles of steganography
(Stefan Katzenbeisser) introduces a model for steganographic communication (the ‘prisoners problem") and discusses various steganographic protocols (such as pure steganography, secret key steganography, public key steganography and supraliminal channels).
* Chapter 3: A survey of steganographic techniques
(Neil F. Johnson and Stefan Katzenbeisser) discusses several information hiding methods useable for steganographic communication, among them substitution systems, hiding methods in two-colour images, transform domain techniques, statistical steganography, distortion and cover generation techniques.
* Chapter 4: Steganalysis
(Neil F. Johnson) introduces the concepts of steganalysis – the task of detecting and possibly removing steganographic information. Included is also an analysis of common steganographic tools.
* Chapter 5: Introduction to watermarking techniques
(Martin Kutter and Frank Hartung) introduces the requirements and design issues for watermarking software. The authors also present possible applications for watermarks and discuss methods for evaluating watermarking systems.
* Chapter 6: A survey of current watermarking techniques
(Jean-Luc Dugelay and Stéphane Roche) presents several design principles for watermarking systems, among them the choice of host locations, psychovisual aspects, the choice of a workspace (DFT, DCT, wavelet), the format of the watermark bits (spread spectrum, low-frequency watermark design), the watermark insertion operator and optimizations of the watermark receiver.
* Chapter 7: Robustness of copyright marking systems
(Scott Craver, Adrian Perrig and Fabien A. P. Petitcolas) discusses the crucial issue of watermark robustness to intentional attacks. The chapter includes a taxonomy of possible attacks against watermarking systems, among them protocol attacks like inversion, oracle attacks, limitations of WWW spiders and system architecture issues.
* Chapter 8: Fingerprinting
(Jong-Hyeon Lee) discusses principles and applications of fingerprinting to the traitor tracing problem, among them statistical fingerprinting, asymmetric fingerprinting and anonymous fingerprinting.
* Chapter 9: Copyright on the Internet and watermarking
(Stanley Lai and Fabrizio Marongiu Buonaiuti) finally discusses watermarking systems from a legal point of view and addresses various other aspects of copyright law on the Internet.

Wednesday, January 17, 2007

IIH-MSP 2007

The third International Conference on Intelligent Information Hiding and Multimedia Signal Processing

November 26-28, 2007
Kaohsiung City, Taiwan
http://bit.kuas.edu.tw/~iihmsp07/

SCOPE: Topics of interest include, but are not limited to:
Track I: Information Hiding and Security
- Watermarking: techniques, attacks, protocols, applications
- Steganography and steganalysis: techniques, protocols, applications
- Cryptography and cryptanalysis: techniques, protocols, applications
- Data authentication issues and access control themes
- Broadcast and public-key encryption
- Forensic analysis and tracing traitors
- Digital rights management and legal aspect
- RFID security and home network privacy
- Platform integrity and trusted computing
- Systems engineering and development for information hiding & security
- VLSI/ASIC/FPGA/SOC design and implementation for information hiding & security
- Enabling technologies and emerging standards for information hiding & security

Track II: Multimedia Signal Processing and Networking
- Multimedia sensing and sensory systems Steganog
- Multimedia source coding and channel coding
- Multimedia signal analysis and visualization
- Multimedia signal mining and data fusion
- Multimedia networking and communication techniques (wired & wireless)
- Multimedia/multimodal signals interpretation and automatic recognition
- Multimedia databases and retrievals
- Multimedia hyperlink techniques and applications
- Advances in multimedia content description interface (e.g. MEPG-7)
- Advances in multimedia framework: (e.g. MPEG-21)
- Advances in multimedia framework: (e.g. MPEG-21)
- Systems engineering and development for multimedia systems
- VLSI/ASIC/FPGA/SOC design and implementations for multimedia systems
- Enabling technologies and emerging standards for multimedia applications

Track III: Bio-Inspired Multimedia Technologies and Systems
- Artificial neural networks for multimedia processing: models, learning paradigms, architectures, and implementations
- Fuzzy systems and evolutionary computing for intelligent multimedia processing
- Human-machine multimodal interaction: e.g. face/speech recognition, facial expression and emotion categorization, gesture analysis and recognition, etc.

Important Dates
The deadline for paper submission May 1, 2007
The date for notification July 1, 2007
The date for camera-ready paper submission August 1, 2007

Call For Papers
IIH-MSP 2007

Wednesday, January 10, 2007

ICICIC 2007

昨天幾個同事和熟悉歐洲旅遊的蕭桂芳老師(英國曼徹斯特大學畢業)談過後, 覺得 CAIP 2007 所在地奧地利維也納並不是英語系國家, 對我們來說, 要找到配合會議的旅行團, 還有自助旅行都不是件容易的事。因此, 就決定把目標改成 ICICIC 2007 了,...

ICICIC 2007
The Second International Conference on
Innovative Computing, Information and Control
September 5 - 7, 2007
Kumamoto City International Center, Kumamoto, Japan
熊本 . 九州 . 日本

Innovative Computing and Information
* Signal and Image Processing
* Speech and Audio Processing
* Image and Video Coding and Transmission
* Video Processing and Analysis
* Image Video Storage
* Retrieval and Multimedia
* Digital Watermarking and DRM
* Artificial Intelligence
* Computing and Intelligent Systems
* Machine Learning
* Biometric and Biomedical Applications
* Sensor and Neural Networks
* Knowledge Discovery and Data Mining
* Others

Intelligent System and Control
* Fuzzy Mathematics and Applications
* Fuzzy Systems Modeling and Analysis
* Knowledge-based Systems
* Hybrid Systems Modeling and Design
* Fault Detection and Identification
* Optimization and Decision Making
* Control Systems and Applications
* Systems Identification
* Risk Analysis and Management
* Modeling and Simulation Techniques
* Others

Important Dates
Deadline for paper submission ------ March 10, 2007
Notification of acceptance ------ April 10, 2007
Camera-ready manuscript Submission ------ April 30, 2007

Call For Papers
CAIP 2007
 

Tuesday, December 26, 2006

CAIP 2007

CAIP 2007
今天下午和實驗室老師討論的結果, 決定今年暑假要參加的學術研討會鎖定為由 IAPR 所主辦的 CAIP 2007
現在目標已經設定了, 接下來就要衝了...


The 12th International Conference on Computer Analysis of Images and Patterns
August 27th - August 29th, 2007
Vienna, Austria

Paper submission deadline: March 30th, 2007
Notification of Acceptance: May 14th, 2007
Camera ready paper: June 4th, 2007


Call For Papers
CAIP 2007

Friday, December 22, 2006

News: 中興大學知名生化教授張OO撤銷 Cell 雜誌論文

(自由時報 2006/12/16 記者蘇孟娟 台中報導)
新聞原文連結

中國留美學生檢舉

中興大學生化所教授張OO一篇「發現細菌基因轉錄起始因子作用」的研究論文,十月獲世界頂尖生物學雜誌Cell刊登;日前一名留美中國學生舉發,其中圖片有人為修改痕跡。興大組成跨校專業委員會審理後,認定張OO須為不當圖片操作負責;張OO十五日指出,所有研究均是真實結果,但為回歸實驗室平靜,已向Cell雜誌提出撤銷申請。

被指修改圖片

張OO強調,相關研究內容均是真實實驗的情況,他未曾加油添醋,圖片是研究所學生為讓人更清楚了解,準備圖檔時直接在原始數據檔中進行標示,造成部分研究數據的原始檔案不齊全,但並不影響研究論點與結論,而且實驗結果可以重複驗證,他雖撤回論文,但「研究歷史絕對會證明我的清白」。

張OO的研究論文獲Cell雜誌刊登,是台灣第一次登上該雜誌的學術研究,興大在十月廿六日特地向外界傳達這項傑出成就,但興大指出,日前有人舉發,該論文部分圖片有人為修改痕跡。

興大十二月八日組成包括台大、中研院及興大專家等跨校專業處理委員會,興大指出,委員會認定張OO必須為不當的圖片操作負責,目前張OO已同意撤回該論文。委員會將徵詢校內外客觀的實驗室重複進行該項實驗,以驗證其結果,做為日後總結懲處的參考。

張:圖片不影響結果

張OO昨日指出,該研究論文是他費時五年才完成的心血,他沒有剪接處理的必要,該圖片並未影響研究結果,以Cell雜誌集合各國頂尖專業人才的嚴格審核標準,若有問題,他的論文根本不可能獲選刊登。

張OO並指出,據他所知,提出質疑者是留美的中國學生,並非該領域專家,只是為回歸研究平靜,本月十二日已向Cell雜誌提出撤銷論文申請,該雜誌迄今未有相關回應。

小瑕疵影響學術嚴謹

中興大學專長植物病毒分子生物學的植病系教授葉OO,也參與了這一次委員會議,他指出,張OO的研究共有七項大圖,每張圖另有小分解圖示,其中的一小張分解圖有剪接現象;他個人認為,應不至於影響整個實驗結構與結果,但學術界畢竟要講究嚴謹,更須嚴肅以對。

中興大學處理張OO教授撤回發表在細胞(Cell)雜誌文章之聲明啟事

後續相關新聞

Monday, December 18, 2006

Hide and Seek: An Introduction to Steganography

Hide & SeekOutGusee 的作者 Niels Provos 和他的指導教授 Peter Honeyman 在 2003 年 May/June 的 IEEE Security & Privacy 雜誌發表了一篇隱藏學的介紹性文章 "Hide and Seek: An Introduction to Steganography"。




這篇文章分成三大主軸:

1. The basics of embedding
 a. capacity, security, robustness
 b. steganography & watermarking
 c. Kerckhoffs' Principle
 d. Alice & Bob

2. Hide and seek
 a. Discrete Cosine Transform (DCT)
 b. Sequential
 c. Pseudo random
 d. Subtraction
 e. Statistics-aware embedding
 f. Comparison

3. Steganography detection on the Internet
 a. Steganographic systems in use
 b. Detection framework
 c. Finding images
 d. Verifying hidden content
 e. Distributed dictionary attack
 

Sunday, December 17, 2006

Attacking the OutGuess

Jessica Fridrich, Miroslav Goljan & Dorin Hogea
"Attacking the OutGuess,"
ACM Workshop on Multimedia and Security 2002,
Juan-les-Pins, France, December 6, 2002





Abstract
In this paper, we describe new methodology for developing steganalytic methods for JPEG images. The proposed framework can be applied to virtually all current methods for JPEGs including OutGuess, F5, and J-Steg. It also enables accurate estimation of the length of the embedded secret message. The methodology is demonstrated on OutGuess 0.2.

這篇論文針對 OutGuess 0.2 隱藏工具提出一套攻擊方法。所提的分析架構, 不但可以運用到不同的JPEG影像隱藏工具, 亦可以正確地估算嵌入訊息的長度。

在這篇論文的第三節中提到 OutGuess 的特點, 與解釋為什麼 Chi-square attack 無法破解 OutGuess。
p2. left column
The OutGuess steganographic algorithm was proposed by Neils Provos to counter the statistical chi-square attack. In the first pass, similar to J-Steg, OutGuess embeds message bits along a random walk into the LSBs of coefficients while skipping 0’s and 1’s. After embedding, the image is processed again using a second pass. This time, corrections are made to the coefficients to make the stego image histogram match the cover image histogram. Because the chi-square attack is based on analyzing first-order statistics of the stego image, it cannot detect messages embedded using OutGuess. Provos also reports that the corrections are made in such a manner to avoid detection using his generalized chi-square attack.
本篇論文的核心觀念描述在底下這段文字:
P.2 right column
Because OutGuess introduces random changes into the quantized coefficients, the spatial discontinuities at the boundaries of all 8×8 blocks will increase. We will measure the discontinuity using the blockiness measure. For detection, we will inspect the increase of this blockiness measure after embedding a 100% message again using OutGuess. This increase will be smaller for the stego image than for the cover image because of the partial cancellation of changes. This difference will form the basis of our message length estimation.
由於 OutGuess 隨機改變量化後 DCT 係數的 LSBs, 增加了還原後 8*8 區塊的不連續性。J. Fridrich用一個 blockiness formula 來估算區塊不連續性。使用 OutGuess 藏入100% 的資料量後, 檢驗區塊不連續性的增加量。如果這張影像是偽裝影像(stego image), 區塊不連續性增加量是比原始掩護影像 (cover image) 來得小。這個差距就是用來估算嵌入資料量的基礎。

而論文中的 blockiness formula, 其實就是不同區塊間的相鄰像素間的色彩差距絕對值的總和。再求取嵌入資料量大小的過程中, 必須知道原始掩護影像的區塊不連續性, S(0)。J. Fridrich 經由實驗證明, 將偽裝影像裁去四列像素後所得的區塊不連續性和原始掩護影像的區塊不連續性值是相近的, 因此可以用來代替所需的 S(0)。

Saturday, December 16, 2006

Origin of Steganography

隱藏學的起源, 最早可回溯到兩千多年以前的古希臘時代, 在希臘歷史學家 Herodotus 的史著中, 記載著一個非常有名的故事:

西元前 491 年, 斯巴達國王 Demaratus 因故被放逐後, 被對希臘懷有侵略野心的東方帝國 - 波斯, 奉為上賓。波斯皇帝 Xerxes 在弭平埃及反抗叛亂後, 開始著手安排對希臘各城邦的侵略戰爭。Demaratus 獲知 Xerxes 的意圖後, 便將平時書寫用的小蠟板, 把上層蠟括除, 再將 Xerxes 的企圖刻在木板, 重新用蠟封起, 送回斯巴達皇宮。

由於小蠟板的外觀看起來並無異狀, 因此能夠順利通過邊境檢查, 送到斯巴達國王 Leonidas 手中。然而, 並沒有人能夠馬上理會出小蠟板的用意, 最後是由 Leonidas 的妻子 Gorgo 猜出小蠟板的下方可能藏有訊息, 命人括去蠟層後, 使得波斯帝國即將大舉入侵的消息揭露出來。斯巴達皇后 Gorgo 可以說是歷史上所記載第一位成功破解隱藏技術的人。

下圖是使用 Google 在網路上搜尋到的當年波斯戰爭地圖。

Map of Persian Wars

Friday, December 01, 2006

Steganography in Merrian-Webster Online

前幾天收到 Merrian-Webster Online 用 email 寄來的 Word of the Day ( November 26, 2006 ) 剛好就是介紹 steganography 這個字, 這個字之前我在 Merrian-Webster Online 是查不到的, 不過現在已經補上來了, 我們來看看 email 的介紹內容:
steganography \steg-uh-NAH-gruh-fee\ noun

: the art or practice of concealing a message, image, or file within another message, image, or file

Example sentence:
No doubt, the Internet has enriched society, but it has a flip side; terrorists, for instance, can secretly network online using steganography.

Did you know?
"Steganography" is a word that was resurrected after being in disuse for almost 150 years! It was put to rest in the early 1800s, labeled an archaic synonym of "cryptography" by dictionary makers, but was brought back to life in the 1980s as a word for a type of digital cryptography. There is nothing cryptic about the word's origin; it is based on the Greek word "steganos," meaning "covered" or "reticent."
steganography 在 Merrian-Webster Online 的連結網址是 http://www.m-w.com/dictionary/steganography
我們也來看看它是怎麼介紹的:
Main Entry: steg·a·nog·ra·phy
Pronunciation: "ste-g&-'nä-gr&-fE
Function: noun
Etymology: New Latin steganographia, from Greek steganos covered, reticent (from stegein to cover) + Latin -graphia -graphy -- more at THATCH
1 archaic : CRYPTOGRAPHY
2 : the art or practice of concealing a message, image, or file within another message, image, or file
- steg·a·no·graph·ic /-n&-'gra-fik/ adjective
相對於 cryptography 的 steganography, Merrian-Webster Online 已經有解釋了, 不過, 相對於cryptanalysis 的 steganalysis, 不曉得還要等多久, 字典的解釋才會補上來...

JPEG Standard

This CCITT Recommendation | ISO/IEC International Standard was prepared by CCITT Study Group VIII and the Joint Photographic Experts Group (JPEG) of ISO/IEC JTC 1/SC 29/WG 10. This Experts Group was formed in 1986 to establish a standard for the sequential progressive encoding of continuous tone grayscale and colour images.

CCITT Rec. T.81 (1992 E)

INFORMATION TECHNOLOGY – DIGITAL COMPRESSION AND CODING OF CONTINUOUS-TONE STILL IMAGES – REQUIREMENTS AND GUIDELINES

Tuesday, November 14, 2006

News: 台灣研究論文被引用次數 亞太地區僅次日本

(中央社 2006-11-14 19:03 記者劉嘉韻台北十四日電)
新聞轉載原址

過去十年間,台灣發表的研究論文數量在全球排名第十八名,在亞太地區排名第五,不過,台灣研究論文的被引用次數,卻為亞太地區第二名,僅次於日本;主辦卓越研究獎的湯姆森集團指出,數據反映出台灣地區的學術研究成果,已逐漸佔有國際領先地位。

湯姆森卓越研究獎首度在台頒發,共有八名學者獲獎;湯姆森集團資深研究員 Nobuko Miyairi 分析指出,近年來台灣研發人員的研究報告被引用次數逐年攀升,顯示台灣學者的研究,在國際學術界越來越重要。

根據湯姆森集團提供的統計數據,一九九六年至二00六年間,世界各國發表學術論文的篇數,美國以兩百八十多萬篇排名第一,日本以七十七萬多篇排名第二,而中國大陸也以四十多萬篇排名第六,南韓十七萬三千多篇排名第十四,台灣以十二萬零四百四十七篇排名全球第十八名、亞太地區第五名。

若依照學術論文被引用次數分析,台灣平均每篇論文被引用次數為五點零五次,在亞太地區僅次於日本的八點一六次,其次是南韓四點八六次,印度三點八七次、中國大陸三點六九次。

Miyairi 表示,最近幾年,台灣除了論文被引用次數急遽攀升之外,二000至二00五年間,台灣的專利申請也成長百分之三十,而這些研究成果是代表台灣不斷追求發明、新技術與新突破的指標。

Saturday, November 11, 2006

Null Cipher

A null cipher hides the message according to some prearranged set of rules, such as "read every fifth word" or "look at the third character in every word."

一次世界大戰 (WWI) 期間, 一名德國間諜利用 Null Cipher 的方式, 從美國 Washington, D.C. 向位於 Berlin 總部回報了底下這段文字:
PRESIDENT'S EMBARGO RULING SHOULD HAVE IMMEDIATE NOTICE. GRAVE SITUATION AFFECTING INTERNATIONAL LAW. STATEMENT FORESHADOWS RUIN OF MANY NEUTRALS. YELLOW JOURNALS UNIFYING NATIONAL EXCITEMENT
IMMENSELY.
為求慎重, 又發了底下一段文字, 作為確認 (check) 之用:
APPARENTLY NEUTRAL'S PROTEST IS THOROUGHLY DISCOUNTED AND IGNORED. ISMAN HARD HIT. BLOCKADE ISSUE AFFECTS PRETEXT FOR EMBARGO ON BYPRODUCTS, EJECTING SUETS AND VEGETABLE OILS.
如果我們第一段訊息中, 每個字的第一個字母抽出, 或是將第二段訊息中, 每個字的第二個字母抽出, 都可以發現底下的句子:
Pershing sails from NY June 1.
John J. Pershing 是一次大戰期間, 美國遠征軍 (American Expeditionary Force) 的指揮官, 也是二次大戰期間, 美國將領們的良師(mentor)。



上述這個 Null Cipher Message 的例子, 最早我是在 IEEE Computer, February 1998 這期 Neil F. Johnson 與 Sushil Jajodia 的文章 "Exploring Steganography: Seeing the Unseen" 所讀到。

今天, 我在 WebStone 公司的 Stego Suite 網頁所提供的技術論文 "What You Can't See Can Hurt You" (2002), 又讀到了相同的例子。

不過, 上述兩篇論文都把故事發生的時間誤寫成 WWII, 發現這點是因為我後來研讀 Gray C. Kessler 的論文 "An Overview of Steganography for the Computer Forensics Examiner" [ PDF ] 時, 也讀到了這段故事, 不過故事發生的時間卻是在 WWI, 與上述兩篇所寫的 WWII 有出入。

From StegoRN

因此, 我就去翻這些論文的原始參考文獻 "THE CODE BREAKERS - The Comprehensive History of Secret Communication from Ancient Times to the Internet" (David Kahn, 1996), 終於確認時間應該是 WWI。

有趣的是書中 (P. 521) 還提到 Pershing 確實出發的日期應該是 May 28, 而不是 June 1, 顯然這位德國間諜情報有誤, 搞了一次烏龍。

Monday, October 23, 2006

JPHIDE and JPSEEK Offical Website

1999年 8 月推出的 JPHIDE and JPSEEK,
作者: Allan Latham ( alatham@flexsys-group.com ),
官方網站網址: http://linux01.gwdg.de/~alatham/stego.html
在官網中, 作者對於這個隱藏軟體的描述如下:
JPHIDE and JPSEEK are programs which allow you to hide a file in a jpeg visual image. There are lots of versions of similar programs available on the internet but JPHIDE and JPSEEK are rather special. The design objective was not simply to hide a file but rather to do this in such a way that it is impossible to prove that the host file contains a hidden file. Given a typical visual image, a low insertion rate (under 5%) and the absence of the original file, it is not possible to conclude with any worthwhile certainty that the host file contains inserted data. As the insertion percentage increases the statistical nature of the jpeg coefficients differs from "normal" to the extent that it raises suspicion. Above 15% the effects begin to become visible to the naked eye. Of course some images are much better than others when used a host file - plenty of fine detail is good. A cloudless blue sky over a snow covered ski paradise is bad. A waterfall in a forest is probably ideal.
其大意是這樣的:
JPHIDE and JPSEEK 是一個可以將檔案藏進 JPEG 影像的程式。在 Internet 上, 有許多類似程式及其各種版本, 然而, JPHIDE and JPSEEK 卻相當特別!JPHIDE and JPSEEK 的設計目的並不僅是簡單地隱藏檔案, 反而是進一步要表達: 要證明某張偽裝影像嵌有檔案是不可能的。給定一個嵌有低嵌入比例 (低於 5% ) 的影像, 在沒有原始影像的情況下, 並沒有辦法去判斷這張影像嵌有訊息的。當嵌入比例增加時, JPEG 係數的統計特性偏離了原來的正常範圍, 就會引起懷疑。超過 15% 的嵌入比例時, 對於影像品質的影響是肉眼可見的。當然, 擁有較多細節的影像是比較適合用來做掩護影像 ( host ) 的。例如: 一張藍天無雲的滑雪天堂的圖片, 就不太適合用來嵌入訊息; 在森林中瀑布拍攝的圖片就是一張理想的掩護影像。
JPHIDE and JPSEEK 有兩個版本:
1. JPHS 0.3 是 Linux 版本, Download: JPHS 0.3 & Signature
2. JPHS 0.5 則是 Window 版本, Download: JPHS 0.5

JPHS 0.5 的執行畫面如下:
From StegoRN

Steganographic Tools for JPEG Images

JPEG standard 是 Internet 上使用最廣泛的影像儲存格式。因此, 網路上也有許多隱藏軟體 ( steganographic software ) 可以將訊息藏到 JPEG 影像中, 然後透過 Internet 傳送秘密訊息。

Niels Provos & Peter Honeyman 在 2002 年 ISOC NDSS'02 研討會提出 " Detecting Steganographic Content on the Internet " 這篇論文, 文中 P.4 提到了三個在 Internet 上較普及的隱藏軟體。
There are three popular steganographic systems available on the Internet that hide information in JPEG images:

• JSteg, JSteg-Shell

JPHide

All of these systems use some form of leastsignificant bit embedding and are detectable by statistical analysis except the latest release of OutGuess. In the following, we describe the specific characteristics of these systems and show how to detect them.

Niels Provos and Peter Honeyman, "Detecting Steganographic Content on the Internet,"ISOC NDSS'02, San Diego, CA, February 2002.

Wednesday, October 04, 2006

News: 國科會 3 年期研究計畫優先審查補助

明年起 國科會重大改革 3年期研究計畫 優先審查補助
(中國時報 2006/10/02 李宗祐 台北報導)
新聞原文連結

最為學術界詬病的國科會研究補助審查制度,明年起有重大變革!為鼓勵學者研究計畫「重質不重量」,明年起,國科會以「三年期」研究計畫優先審查補助;若無 特殊理由,「一年期」研究計畫很難再獲補助。由於事涉國內各大學及研究機構數萬名學者權益,國科會最近陸續透過研討會說明制度變革內容。

副主委楊弘敦表示,學者現所提都是短程的一年期計畫,但重大研究需要長期投入才有具體成效,因此今年試辦鼓勵學者提出「三年期」研究計畫。但試辦情況不理 想,審查通過的補助計畫仍有七○%到八○%是一年期研究計畫。楊弘敦指出,目前每年向國科會申請經費補助的研究計畫超過三萬件,以五○%通過率計算,每年 獲補助的計畫一萬六、七千件,而超過三成的學者隔年提出的延續性研究計畫都會順利通過審查,要學者每年送審,實在沒什麼必要。

為讓學者全心投入研究工作,減少行政業務造成的干擾,國科會決定,明年起全面實施「三年期」研究計畫審查制度。楊弘敦表示,每年新提出的研究計畫可望從三 萬件以上減少一半,可大幅提升審查品質,並進一步改善學術界至今仍質疑的審查不公現象,同時減輕學者每年寫計畫書送審的壓力。明年起,除非是非常有創意,或配合政策需求者可提出一年期計畫;若無特殊理由而提出一年期研究計畫,恐怕很難獲補助。但也不代表三年期研究計畫申請一次獲准,就可安穩過三年,執行成效若不彰,會中途取消補助。

此外,為鼓勵學者參與國際合作,國科會從明年起,直接將出國參加國際研討會或到國外參訪的補助經費,納入研究計畫補助項目,不必再另外申請。學者只要評估個人研究必須在某階段與國外學者交換意見,就可直接在研究計畫內提出申請。

Wednesday, August 30, 2006

在 SIP 2006 與 Session Chair 合照




SIP 2006議程 除了四場的專題演講(Keynote Address) 之外, 論文報告總共分成 9 個 Sessions, 分別是:

Session 1 - Pattern Recognition
Session 2 - Video Signal Processing
Session 3 - Image Processing Applications
Session 4 - Image Processing and Analysis I
Session 5 - Image Processing and Analysis II
Session 6 - Biomedical Signal and Image Processing
Session 7 - Signal Processing for Communication
Session 8 - Signal Processing Applications
Session 9 - Signal Processing and Filtering

我們的論文被安排在 Session 4 - Image Processing and Analysis I,
報告的時間在 Tuesday, August 15, 2006
早上 8:30 在 Kahuku Room

Session 4 的 Chair 是 Yan Meng, 報告的 12 篇論文中,
有 3 篇來自 USA, 2 篇來自 Germany, 2 篇來自 Korea,
其餘 5 篇論文分別來自 The Netherland, Hongkong PRC, Japan, Brazil, Taiwan。

在 SIP 2006 巧遇王元凱教授



2006/08/14 下午, 我們前往 SIP2006 會議會場 Sheraton Waikiki Hotel 報到, 在放置點心的交流廳巧遇了也是同樣來自台灣的 王元凱教授, 王教授任教於 輔大電子系, 也曾經當過 IAPR 學會 Taiwan 分會的祕書長, 去年在翡翠灣舉辦過 CVGIP 2005 研討會, 我們實驗室也有不少老師同學前往參加該研討會。因此, 大家還算熟識, 這次在夏威夷相遇, 實在頗神奇。不過更神奇的是王教授夫婦也是住在整修中的 Ohana Islander Waikiki。王教授發表的論文被安排在會議第一天下午報告, 此時他已經報告完畢, 無事一身輕了。



你注意到我們所背的 IASTED 包包了嗎? 標價一個 670 美元, 可不輸給LV 呢!至於身上的 Aloha Shirt, 則是路邊攤買的, 15 美元搞定。

今天的任務是要把論文報告的會場弄清楚, 我們的論文被安排在 SIP Session 4 - Image Processing and Analysis, 第二天早上在 Kahuku Room 報告, 這個會場有個很棒的視野, 正面對著游泳池與太平洋。



Saturday, August 12, 2006

SIP 2006 的投影片終於完成了

今天晚上要搭機前往夏威夷, 終於趕在昨晚把投影片完成了, 前後差不多改了一個星期才完成

A NOVEL QUANTITY BASED ON CLIPPING STATISTICS FOR JSTEG STEGANALYSIS,

Yeuan-Kuen Lee, Shih-Yu Hwang, Zhan-He Ou,
8th IASTED Int. Con. on Signal & Image Processing (SIP 2006),
August 14-16, 2006, Honolulu, Hawaii, USA


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