MULTİMEDYA ÜZERİNDE ÖZEL VERİLERİ GİZLEMEK İÇİN KARŞILAŞTIRMA TABANLI YENİ STEGANOGRAFİK ALGORİTMALARIN GELİŞTİRİLMESİ

Abstract

Tarih boyunca insanlığın korunması gereken sırları ve düşmanların çözemeyeceği şekilde müttefiklere iletilmesi gereken bilgileri vardı. Bu önemli ve değerli bilgilerin korunması hedefine ulaşmak için kriptografi ve steganografi hem geçmişte hem de günümüz dünyasında sıklıkla kullanılan yöntemlerden olmuştur. Bu makale, renkli görüntüler üzerinde veri gizleyen stenografik bir algoritma tasarımı ve bu algoritmadan türeyen iki farklı algoritma tasarımını tanımlar. Gizli mesajın bitleri, karşılaştırma yöntemi kullanılarak her bir piksele sırayla gömülür. Karşılaştırma yöntemi, görüntünün ve mesajın bitlerini eşleştirerek çalışır. Taşıyıcı imge ile gizli mesajın eşleşen bitlerinin sayısına bağlı olarak, taşıyıcı imge baytlarının en önemsiz bitleri (LSB) değişir. Önerilen yöntem, optimal koşullar altında 5 bayt içerisinde 1 baytlık veriyi gizleme potansiyeline sahiptir. Tasarlanan algoritmalar bir dizi renkli görüntü üzerinde test edilmiş ve görüntü kalitesinden ödün vermeden yeterli miktarda verinin görüntülere gömülmesi açısından tatmin edici sonuçlar elde edilmiştir. Elde edilen sonuçlar farklı performans kriterlerine göre LSB tekniği ve benzer yöntemlerin sonuçları ile karşılaştırılmıştır.

Keywords

• Karşılaştırma Tabanlı Steganografi
• İmge Steganografisi
• En Önemsiz Bit
• İki-bit Steganografi

DEVELOPMENT OF NOVEL COMPARISON BASED STEGANOGRAPHY ALGORITHMS ON MULTIMEDIA TO HIDE PRIVATE DATA

Abstract

Throughout history, humanity has had secrets to safeguard, information that needed to be conveyed to allies in a way that enemies couldn't decipher. To achieve this goal of safeguarding important and valuable information, cryptography and steganography have been frequently used methods both in the past and in today's world. This article introduces a steganographic algorithm designed for hiding data in the color images, along with two different algorithm designs derived from this method. The bits of the hidden message are embedded sequentially into each pixel using the bit comparison. The comparison method works by matching the bits of the image and the message. The least significant bits (LSB) of the carrier (cover) image bytes change depending on the number of matching bits between the carrier image and the hidden message. The proposed method has the potential to hide 1 byte of data within 5 bytes under optimal conditions. The designed algorithms have been tested on a series of color images, and satisfactory results have been achieved in terms of embedding a sufficient amount of data into the images without compromising image quality. The results have been compared with the results of the LSB technique and similar methods based on various performance criteria.

Keywords

• Comparison-based Steganography
• Image Steganography
• Least Significant Bit
• Two-bit Steganography

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