K-En Az Anlamlı Bitlere Dayalı Kaotik Bir Harita Kullanan Renkli Görüntü Steganografisi

Öz

Günümüzde dijital iletişim içerisinde bilginin güvenliği çok önemli bir yer tutmaktadır. Uçtan uca iletişimlerde önemli bilgilerin şifrelenmesi veya bir taşıyıcı üzerine gömülerek gizlenmesi bilgi güvenliği için kullanılan yöntemlerinin başında gelir. Bazı durumlarda güvenliği artırmak için yöntemler karma bir şekilde kullanılıp bilgi iletişim kanalları içerisine bırakılabilir. Bu yöntemlerdeki ortak amaç, kaynaktan çıkan önemli bilgilerin, iletişimde ilgisi olmayan kişilerin eline geçmeden veya anlaşılmaz şekle dönüştürülerek hedefe gönderilmesidir. Bu çalışmada, steganografi ile ilgili temel bilgiler verildikten sonra önerilen renkli görüntü gizleme yöntemi anlatılmıştır. Yöntemde, önce gizlenecek görüntü veya metindeki veriler genişletilmiş 1B lojistik harita kullanılarak rastgele dağıtılmış ardından renkli örtü görüntüsündeki en az anlamlı k-bit ile değiştirilmiştir. Gizlenmek istenen bilgi şifrelenerek bilgi güvenliğinin artırılması hedeflenmiştir. Yöntemin başarısı, bilginin saklanacağı bit düzlem sayısına göre farklı boyutlarda görsel ve metinler üzerinde denenmiştir. Önemli güvenlik değerlendirme kriterlerinden PSNR ve MSE ölçütleri incelenmiştir. 1 bit düzlemin kullanıldığı 75x100 boyutlarındaki görselin gizlendiği işlemde PSNR 54.4359, MSE 0.23415, 7500byte metnin gizlendiği işlemde PSNR 56.7213, MSE 0.13834 olarak hesaplanmıştır. 4 bit düzlemin kullanıldığı 150x150 boyutlarındaki görselin gizlendiği işlemde PSNR 36.503, MSE 14.5472, 22500byte metnin gizlendiği işlemde PSNR 38.657, MSE 8.8585 olarak hesaplanmıştır. Deneysel sonuçlarla, algoritmanın iyi bir performansa sahip olduğu, istatistiksel analiz saldırılarına karşı iyi bir performans gösterdiği kanıtlanmıştır.

Anahtar Kelimeler

• Steganografi
• Renkli görüntü şifreleme
• En önemsiz bit
• Kaotik harita
• Veri güvenliği

A Color Image Steganography Using A Chaotic Map Based On K-Least Significant Bits

Öz

Nowadays, information security has a very important place in digital communication. Encrypting important information in end-to-end communications or hiding it by embedding it on a carrier is one of the methods used for information security. In some cases, methods are used in a mixed manner to increase security. An encrypted information can be hidden on the carrier or a hidden information can be encrypted and released into communication channels. The common purpose of these methods is to send the important information from the source to the target by transforming it into an incomprehensible form or before it gets into the hands of unrelated people.In this study, after giving brief information about steganography, the proposed color image hiding method is explained. In this method, first the data in the image or text to be hidden is randomly distributed using an expanded 1D logistic map, and then replaced with the least significant k-bits (K-LSB) in the colored cover image. It is aimed to increase information security by encrypting the information that is desired to be hidden. The success of the method is tested on images and texts of different sizes according to the number of bit planes in which the information will be stored. PSNR and MSE criteria, which are important safety evaluation criteria, are examined. PSNR and MSE are calculated as 54.4359, 0.23415 respectively in the process of hiding the 75x100 image using 1 bit plane, by the way PSNR and MSE are calculated as 56.7213, 0.13834 respectively in the process of hiding the 7500byte. PSNR and MSE are calculated as 36.503, 14.5472 respectively in the process of hiding the 150x150 image using 4 bit plane, by the way PSNR and MSE are calculated as 38.657, 8.8585 respectively in the process of hiding the 22500byte. With experimental results, it is proven that the algorithm has good performance, good performance against statistical analysis attacks.

Anahtar Kelimeler

• Steganography
• Color image encryption
• Least significant bit
• Chaotic map
• Data security

Kaynakça

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