20.500.12556/RUP-8283 Uporaba steganografije slik na spletu diplomsko delo Image steganography on the web Steganografija je postopek skrivanja sporočil v različne medije. V diplomski nalogi smo predstavili primere uporabe slikovne steganografije s poudarkom na metodi najmanj pomembnega bita (LSB) in na metodi diskretne kosinusne transformacije (DCT). Izvedli smo skrivno komunikacijo s pomočjo slik s steganografsko vsebino. Metodo DCT smo implementirali v programskem jeziku Python. Rezultate smo pregledali s stegoanalitičnimi orodji in primerjali njihovo učinkovitost. Opisali smo tudi postopek implementacije lastnega steganografskega algoritma in skrivni prenos podatkov s pomočjo steganografije ter primerjali orodja za stegoanalizo. Ugotovili smo, da so nekateri programi za stegoanalizo specializirani za točno določene metode steganografije. Odkrili smo tudi način skrivanja sporočil v formatih z izgubo, kot je JPEG. Steganography is the process of hiding messages within various media. This thesis presents examples of using image steganography with a focus on the LSB and DCT methods. Covert communication was carried out using images with steganographic content. The DCT method was implemented in the Python programming language. The obtained results were examined using steganalytic tools, and their effectiveness was compared. The process of implementing a custom steganographic algorithm, secret data transmission through steganography, and a comparison of steganalysis tools are also described. It was found that some steganalysis programs are highly specialized for certain steganographic methods. Additionally, a method for hiding messages in lossy formats, such as JPEG, was identified. Steganografija diskretna kosinusna transformacija JPEG stegoanaliza skrivna komunikacija. Steganography Discrete Cosine Transform JPEG steganalysis covert communication. true true false [N. Gradišnik] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-01-03 12:08:19 2024-03-01 13:35:10 2024-04-13 04:02:48 0000-00-00 00:00:00 2024 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (VII, 32 f.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 004.774.6:004.056.5(043.2) 192308995 UN_Gradisnik_Nikolaj_2024.pdf UN_Gradisnik_Nikolaj_2024.pdf 1 1ADAC0C80661492B80F4AED7596E52FE 6d2fc6eaf6d24617e43c298d2e553e29753903656fde5662da4f76c2a7707958 b568140c-ae37-11ee-a03c-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=175147 Fakulteta za elektrotehniko, računalništvo in informatiko 0 0 0