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Digital Image Steganography
Kolarčík, Tomáš ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
This bachelor thesis deals with digital image steganography and implements some of the available methods. This thesis describes steganography on a general level, it's history and it's current form. It also shows it's classification according to the type of carrier, the classification of the methods according to the style of hiding data and the influence of the hidden information. The primary subject of this thesis is image steganography, where facts that allow imperceptibly hide data inside image are described. A great part of this thesis is dedicated to the characteristics of the methods, which we observe and to the methods themselves. All of the methods described are implemented in a graphical and console application. The created application provides multiple image formats for hiding. In the last part, testing is performed in terms of capacity, imperceptibility and robustness.
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Digital Steganalysis
Lakatos, Attila ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
Cieľom tejto bakalárskej práce je predstaviť základnú teóriu za digitálnou steganografiou a digitálnou stegoanalýzou, prezentovať niektoré aktuálne používané algoritmy a vývoj v týchto oblastí. Okrem toho, poskytuje prehľad o starovekej a nedávnej histórii vyššie uvedených vedeckých disciplín. Táto publikácia ilustruje rôzne prístupy k implementácii steganográfie pomocou obrázkových súborov. Práca sa tiež snaží identifikovať požiadavky dobrého steganografického a stegoanalytického algoritmu a porovnávať ich výkonnosť s požiadavkami. Na záver, diskutuje o úvahe autora k výsledkom, účinnosti ukrývania správ a mieru úspešnosti pri odhaľovaní.
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Digital Steganography for Executables
Bever, Ľuboš ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
Steganography for executable files is the least common steganography. Research in this area has subsided after several, not many, attempts to implement it. The aim of this work is the implementation of existing methods and its modification proposal. Extensible software that has been created, can be also used to implement other methods. The implemented methods were properly tested, evaluated and compared. The comparison results show, that the used instruction substitution method, roughly corresponds to its reference value 1/110, however the results are highly dependent on the input binaries. The proposed extension of this method averages a data rate of 1/84, which is only 1.5 times less than the value obtained from another existing implementation in which specialized software was used to search for equivalence classes. The maximum data rate obtained from test programs is 1/38.
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Digital Steganography for Executables
Bever, Ľuboš ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
Steganography for executable files is the least common steganography. Research in this area has subsided after several, not many, attempts to implement it. The aim of this work is the implementation of existing methods and its modification proposal. Extensible software that has been created, can be also used to implement other methods. The implemented methods were properly tested, evaluated and compared. The comparison results show, that the used instruction substitution method, roughly corresponds to its reference value 1/110, however the results are highly dependent on the input binaries. The proposed extension of this method averages a data rate of 1/84, which is only 1.5 times less than the value obtained from another existing implementation in which specialized software was used to search for equivalence classes. The maximum data rate obtained from test programs is 1/38.
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Digital Steganalysis
Lakatos, Attila ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
Cieľom tejto bakalárskej práce je predstaviť základnú teóriu za digitálnou steganografiou a digitálnou stegoanalýzou, prezentovať niektoré aktuálne používané algoritmy a vývoj v týchto oblastí. Okrem toho, poskytuje prehľad o starovekej a nedávnej histórii vyššie uvedených vedeckých disciplín. Táto publikácia ilustruje rôzne prístupy k implementácii steganográfie pomocou obrázkových súborov. Práca sa tiež snaží identifikovať požiadavky dobrého steganografického a stegoanalytického algoritmu a porovnávať ich výkonnosť s požiadavkami. Na záver, diskutuje o úvahe autora k výsledkom, účinnosti ukrývania správ a mieru úspešnosti pri odhaľovaní.
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Digital Image Steganography
Kolarčík, Tomáš ; Šimek, Václav (referee) ; Strnadel, Josef (advisor)
This bachelor thesis deals with digital image steganography and implements some of the available methods. This thesis describes steganography on a general level, it's history and it's current form. It also shows it's classification according to the type of carrier, the classification of the methods according to the style of hiding data and the influence of the hidden information. The primary subject of this thesis is image steganography, where facts that allow imperceptibly hide data inside image are described. A great part of this thesis is dedicated to the characteristics of the methods, which we observe and to the methods themselves. All of the methods described are implemented in a graphical and console application. The created application provides multiple image formats for hiding. In the last part, testing is performed in terms of capacity, imperceptibility and robustness.
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Digital Steganography
KOCIÁNOVÁ, Helena
Digital steganography is a technique for hiding data mostly into multimedia files (images, audio, video). With the development of information technology this technique has found its use in the field of copyright protection and secret data transfer, could be even applied in places where is limited possibility of using cryptography (e. g. by law). This thesis gives insight into digital steganography and contains an application using this technique.
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