Bir Siber Casus Olarak Dijital Görüntü: Gizli Bilgileri Aktarmak İçin Gri Kodlu Güvenli Bir Model

Öz

İnternetin yaygınlaşması ve veri transferinin farklı türde cihazlar arasında da gerçekleştirilebilir olması, günümüzde yoğun bir multimedya trafiğinin oluşmasına neden olmuştur. Yalnızca Meta grubuna bağlı sosyal medya platformlarında saniyede yüz binden fazla statik görüntü dosyası transferi gerçekleşmektedir. Özellikle görüntü, ses, video gibi doğrudan insan algısını hedef alan multimedya nesneleri ağ üzerinde birer siber casus olarak kullanılabilmektedir. Bunun için genellikle steganografi yöntemleri kullanılır. Bu çalışma, alternatif bir dijital görüntü steganografisi yöntemi önermektedir. Önerilen yöntem, alışılmışın dışında hem frekans alanında hem de bit düzlemi dilimleme yöntemi ile çalışmaktadır. Gizli veriye, minimum entropi elde etmek için gray kodlaması uygulanmıştır. Yöntemin sonuçları, farklı gray kodu uzunlukları ve farklı bit düzlemi dilimleri üzerinde çok sayıda iterasyon gerçekleştirerek yüzey grafikleri ve tablolar ile sunulmuştur. Yöntemin gerçek dünyada uygulanabilirliği için steganaliz testleri yapılmış ve sonuçları gösterilmiştir. Yöntem algılanamazlık, sağlamlık ve veri yükü açısından literatürdeki bazı yöntemlerle kıyaslanmıştır. Yüksek veri yüküne rağmen, yapısal ve algısal matematiksel testlerde benzer yöntemlerden daha yüksek skorlar elde edilmiştir.

Anahtar Kelimeler

• Siber casus
• Görüntü steganografisi
• Bit düzlemi dilimleme
• Steganaliz

Digital Image as a Cyber Spy: A Gray Coded Secure Model to Transfer the Secret Information

Öz

The widespread use of the Internet and the ability of data transfer between different types of devices have caused intense multimedia traffic today. More than a hundred thousand image files are transferred per second on Meta group social media platforms alone. In particular, multimedia objects that directly target human perception such as images, audio, and video can be used as cyber spies on the network. Steganography methods are generally used for this. This study proposes an alternative digital image steganography method. The proposed method works in both the frequency domain and bit plane slicing methods, which is unusual. Gray coding is applied to the secret data to obtain minimum entropy. The results of the method are presented with surface graphics and tables by performing many iterations on different gray code lengths and different bit planes. Steganalysis tests have been performed for the applicability of the method in the real world and the results are shown. The method has been compared with some methods in the literature in terms of imperceptibility, robustness, and data load. Despite the high data load, higher scores were obtained than similar methods in structural and perceptual mathematical tests.

Anahtar Kelimeler

• Cyber spy
• Image steganography
• Bit plane slicing
• Steganalysis

Kaynakça

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