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Digital Steganography and Steganalysis
Poremba, Tomáš ; Wiglasz, Michal (referee) ; Strnadel, Josef (advisor)
This thesis deals with digital steganography and steganalysis. It explains the significance of both disciplines and gives a brief overview of the history in the given fields. The paper separates existing steganographic and steganalytic methods and describes the attributes of various branches of steganography. With respect to the chosen field of steganography (the image steganography), the paper narrows down the set of suitable steganographic and steganalytic methods, whose features are then described in detail. The results of the thesis inlcude experiments that verify the features of chosen steganographic methods and evaluation of steganalytic methods and their success in detection of steganography.
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Invisible watermarking of digital signals
Pacura, Dávid ; Horák, Karel (referee) ; Petyovský, Petr (advisor)
Cílem téhle práce je navrhnutí nových technik pro robustní neviditelné značení digitálních signálů. Nejdříve je prezentován současný stav tohoto odvětví a dostupné softwarové řešení. Poté následuje návrh několika algoritmů pro neviditelné značení, přičemž každý z nich je založen na jiném principu. Dále je připravena sada digitálních testovacích signálů společně s testovacím softwarem pro otestování navržených řešení a jejích porovnání s vybraným dostupným softwarem. Poté následuje srovnání naměřených výsledků, výkonu a jejích diskuze.
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Software for data hiding in image files
Morkus, Filip ; Říha, Kamil (referee) ; Burda, Karel (advisor)
In my master's thesis I start fromthedescriptionofthebasics and thebeginningsofsteganography, itsmethods and purposes. Detaileddescriptionof BMP fileswithhidden data follows. A filestructureisanalysedintothesmallestdetails to avoiddamagingfilewhilehiding. At thesametime to make profit oftheinformationincluded in a fileheader in the most effectiveway. Anotheraimwas to explain a principalofsteganographicalmethoditself, usedforhiding data into BMP file. Based on these findings, a programmeconceptwasdesigned and consequentlythatprogrammewas made. Itcarriesoutthehiding and revealing data intothe image files. Directionsfor use are made to thisprogramme and thereisalso a demo ofthefeaturesdescribingeach step. At the end ofmymaster's thesis anattentionispaid to thoseinfluencesthatcanbelimitingforthismethod. Exceeding these limitswouldlead to breakingthesteganographicalmethod, whichmeansrevealingthehidden data.
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Digital Audio Steganography
Morávek, Jan ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
Nowadays much more information is transfered and saved in electronic files. The digitalization allows easier access to information, not only for the user, but also for a possible attacker. This fact leads to progress in information security area. Besides cryptography, this also includes steganography. This thesis is focused on steganography in general and describes digital audio steganography in detail. Implementation and evaluation of several methods are also parts of this thesis.
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A Hidden GNU/Linux File System
Pavlásek, Martin ; Smrčka, Aleš (referee) ; Lengál, Ondřej (advisor)
Some sensitive data need such a way of hiding that hides not only the content of the data but its preserve itself. The goal of this Bachelor's thesis is to create a file system that enables hiding of files with sensitive data to other files. This text contains an overview of principles used in current file systems and a description of the structure and use of the FUSE technology. Further, the work describes the design of a filesystem that hides files into ID3 tags of MP3 music files and it's implementation in C++. The created filesystem is experimentally assessed and evaluated.
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Digital Audio Steganography
Matuška, Matej ; Bidlo, Michal (referee) ; Strnadel, Josef (advisor)
The subject of this thesis is steganography, i.e the science that deals with hiding information in other objects. In the introduction, steganography in general and also several areas of digital steganography are described. Next, the thesis focuses on digital audio steganography. After an introduction to digital sound and PCM and WAVE formats, several methods from this area, including one new, are described in more detail. Implementation of the new and 4 other selected methods in newly developed extensible tool for steganography and their evaluation are also parts of this thesis. The 3 basic steganography requirements (imperceptibility, robustness, capacity) were evaluated on recordings of music, speech and various sounds.
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Digital Text Steganography
Pouč, Petr ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
This bachelor's thesis aims to identify the characteristics of a field of science called steganography, especially digital text steganography. The purpose of this study is to become acquainted with this field and analyze some of the methods of digital text steganography in a detail. Another objective of this bachelor's thesis was to choose and implement suitable methods for information hiding in text data. The chosen methods that were implemented were finally verified by automated tests and analyzed in detail. Based on the results of this research, it can be concluded that secret messages hidden by these methods can be very difficult to spot. The final statistics were processed into a comprehensible table, in which we can see, that perceptibility of some methods got over 95 % and success rate of hiding short messages reached almost 100 %. Based on the results of this study, we can choose a suitable method for the most reliable information hiding in the text file, so we can prevent unwanted decryption of a hidden message.
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Covering sets in steganography
Vacek, Jan ; Holub, Štěpán (advisor) ; Hojsík, Michal (referee)
Steganography is a science which is interested in communication hiding. This work is focused on the most recent methods related to this topic. Mainly, it is matrix embedding, which uses coding theory, and sum and difference covering sets (SDCS). Rainbow coloring of grid graphs is used to receive even better results. This technique decrease amplitude of performed changes. It makes stegosystems less likely to be detected. Properties which describe behavior of each stegosystem are included for each technique. 1
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Methods of steganography
Obdržálková, Karolína ; Blažek, Petr (referee) ; Člupek, Vlastimil (advisor)
This bachelor thesis deals with steganography, its types and methods. Steganography is generally described in this work. A significant part of this thesis is devoted to the development of steganography and also describes how is steganography used for malware and copyright protection. The next part describes the types of steganography according to the type of carrier, their methods and properties of steganographic methods. Based on theoretical knowledge, an application with a graphical user interface was created to hide and reveal secret information using steganographic method LSB. This application is described in the final part together with the evaluation of security of hidden information.
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Digital Steganalysis
Molnár, Ondřej ; Nevoral, Jan (referee) ; Strnadel, Josef (advisor)
Steganalysis is the opposite science discipline of the steganography - which is an art of information hiding . Steganography deals with embedding of secret messages to different types of media. The most commonly used cover media in modern steganography are image files . This bachelor's thesis creates an overview of known steganograpy and steganalysis methods . It also describes practical implementation of application that is able to detect hidden information in image.
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