Steganalysis based on JPEG compatibility

العناوين الأخرى

تحليل الكتابة المخفية المبني على أساس تناسقية ال JPEG

مقدم أطروحة جامعية

al-Tai, Mayy Muwaffaq Abbas

مشرف أطروحة جامعية

Abbud, Luayy Kazim

الجامعة

جامعة بغداد

الكلية

كلية العلوم

القسم الأكاديمي

قسم علوم الحاسبات

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2004

الملخص الإنجليزي

Steganalysis is a relatively new branch of research.

While steganography deals with techniques for hiding information.

The goal of steganalysis is to detect and/or estimate potentially hidden information from observed data with little or no knowledge about the steganography algorithm and/or its parameters.

In general, extraction of the secret message could be a harder problem than mere detection.

In this research we describe a new steganalytic technique that can detect modifications in color images, such as those due to steganography and watermarking, as long as the original image (the cover image) has been previously stored in the JPEG format.

The steganalytic technique starts with extracting the JPEG quantization matrix by carefully inspecting the clusters of DCT coefficients.

Then, each block is analyzed if its pixels values are truncated values of an inverse DCT transform of a set of coefficients quantized with the extracted quantization matrix.

A simple necessary condition is derived that makes the analysis computationally feasible.

If the corresponding quantized DCT coefficients are found, the block is termed compatible, otherwise it is not.The steganalytic technique will work for many steganographic methods such as (S-TOOLS4, HIDE4PGP, and HIDE IN SEQUENTIAL LSB), except the methods that embed information directly into the compressed JPEG stream.

One of the important conclusions drawn is that a new value for the equation of the quality condition adopted drawn from the result rather than the mentioned value in the researchs.

This adopted system can be used with true color images rather than gray level images

التخصصات الرئيسية

تكنولوجيا المعلومات وعلم الحاسوب

عدد الصفحات

103

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-604775