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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Gazi Üniversitesi - ...arrow_drop_down
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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İkili görüntü kullanarak imza steganografi modellerinin geliştirilmesi

Authors: ERDEM, OSMAN AYHAN;

İkili görüntü kullanarak imza steganografi modellerinin geliştirilmesi

Abstract

Steganografi, mesaj iletilmek istenen alıcıdan başka hiç kimsenin mesajın varlığından haberi olmayacağı şekilde gizli mesajlar yazma sanatı ve bilimine verilen addır. Bilgi güvenliği alanında sınıflandırılır. Son zamanlarda bilgisayar ve ağ teknolojileri, steganografide iletişim kanallarını kullanmak için kolay bir yöntem sağlamıştır. Ayrıca, günümüzde elle atılan imzalarla birlikte elektronik imzalar da günlük hayatın önemli bir parçası haline gelmiştir. Steganografi bu imzaların izinsiz kullanımını önlemek ve kulanıcıların güvenli bir şekilde iletişim kurmasına fırsat tanır. Bu tezde ikili görüntülere dayalı bir imza steganografi modeli sunulmaktadır. Piksellerin sınırlı sayıda değer almasından dolayı, görünür hatalar olmadan verileri ikili görüntü içerisine saklamak bu yöntemin zorluklarındandır. Bu yöntemle, stego imza görüntüsü elde etmek üzere düşük düzeyli özellikleri (siyah bir pikseli beyaza dönüştürme ya da beyaz bir pikseli siyaha dönüştürme gibi) değiştirmeye dayalı bir şekilde kapak görüntüsü içerisine gizli imza verisini saklanmaktadır. Ardından, orijinal görüntü kullanılmadan gizlenmiş imza çıkarılabilir. Yapılan çalışmaya ait modelin başarısı bir bilgisayar yazılımı ile de edilmiştir.

Steganography as the art and science of writing hidden messages in such a way that no one apart from the intended recipient knows of the existence of the message. Being classified under information security. Current days, computers and networks technologies provide an easy method to use communication channels for steganography. Moreover, lately, manual and electronic signatures became one of the important topics in the daily life. To prevent unauthorized use of these signatures and allows any pair of users to communicate securely. Therefore, this thesis presents a signature steganography model based on binary images. However, hiding the data in binary images without visible defects increases the difficulty of this method, because the pixel take on only a limited number of values. This method hides secret signature data inside cover image depending on changing low level features technique ( such as flipping a black pixel to white or vice versa) in order to obtain the stego signature image. Then, the hidden signature can be extracted without using the original image. The performance of the proposed model has been successfully tested using computer programs.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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