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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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Measurement of ultrasound speed
Pouč, Petr ; Roleček, Jiří (referee) ; Jiřík, Radovan (advisor)
The thesis deals with the ultrasonic velocity measurement. The ultrasonic velocity was determined on basis of ultrasonic flight time from a transmitter to a receiver. Three methods how to determine the ultrasonic velocity in medium were proposed. Special algorithms have been created and later on build in the developed program. All the software was developed in Agilent VEE Pro 8.5. The thesis contains a proposal of two experiments tutorials for the department of Biomedical engineering that will be used during experimental lessons. The experiments deal with ultrasonic velocity measurement.
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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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|
|
Measurement of ultrasound speed
Pouč, Petr ; Roleček, Jiří (referee) ; Jiřík, Radovan (advisor)
The thesis deals with the ultrasonic velocity measurement. The ultrasonic velocity was determined on basis of ultrasonic flight time from a transmitter to a receiver. Three methods how to determine the ultrasonic velocity in medium were proposed. Special algorithms have been created and later on build in the developed program. All the software was developed in Agilent VEE Pro 8.5. The thesis contains a proposal of two experiments tutorials for the department of Biomedical engineering that will be used during experimental lessons. The experiments deal with ultrasonic velocity measurement.
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