A New Watermarking Algorithm Based on Visual Cryptography and Secret Sharing for Color Image Authentication and Tamper Detection

Yıl 2017, Cilt: 1 Sayı: 1, 1 - 8, 30.06.2017

Turker Tuncer Engin Avcı

Öz

Digital forensics is a multi-disciplinary structure that is standardized on the collection, storage, compilation and analysis of evidence, usually obtained as data, through information systems. Digital forensics is not contrary to what is supposed to be a special field, it is a wide field discipline. In this article, a new fragile watermarking method is presented instead of cryptographic hash functions which are frequently used in digital forensics applications. The hash functions cannot detect the region where the attack is made, so we proposed fragile watermarking for authentication in digital data. The best way to make a fragile watermark is to use secret sharing algorithms. In this article, authentication and tamper detection for RGB images are performed using Wu and Chen's visual secret sharing algorithm. The proposed fragile watermarking algorithm is an algorithm with high visual quality, fragile, reliable and high data hiding capacity. Owing to Wu and Chen’s visual secret sharing algorithm, a new fragile watermarking method that is sensitive to angular attacks is proposed.

Anahtar Kelimeler

Data Hiding, Watermarking, Visual Cryptography, Digital Forensics, Hash Functions, Information Security, Image Processing

Renkli İmgelerde Kimlik Doğrulaması ve Saldırı Tespiti için Görsel Sır Paylaşım Tabanlı Yeni Bir Kırılgan Damgalama Algoritması

Öz

Adli
bilişim, bilişim sistemleri üzerinden genellikle veri olarak elde edilen
delillerin toplanması, saklanması, derlenmesi ve analizi konusunda standartları
oluşturulan çok disiplinli bir yapıdır. Adli bilişim sanılan aksine özel bir
alan değil, geniş alan disiplinidir. Bu makalede adli bilişim uygulamalarında
sıklıkla kullanılan özet fonksiyonlarının yerine kırılgan damgaların
kullanılması önerilmiştir. Özet fonksiyonları saldırının yapıldığı bölgeyi
tespit edemezler bu sebepten dolayı sayısal verilerde kimlik doğrulama için
kırılgan damgaların kullanılması önerilmiştir. Bir damgayı kırılgan hale
getirebilmenin en iyi yolu sır paylaşım tabanlı algoritmaları kullanmaktır. Bu
makalede Wu ve Chen’ in görsel sır paylaşımı algoritması kullanılarak, RGB imgeler
için kimlik doğrulama ve saldırı tespiti yapılmıştır. Önerilen kırılgan
damgalama algoritması yüksek görsel kaliteye sahip, kırılgan, güvenilir ve
yüksek veri gizleme kapasitesine sahip bir algoritmadır. Wu ve Chen görsel sır
paylaşımı algoritması sayesinde açısal ataklara karşı hassas, yeni bir kırılgan
damgalama sistemi önerilmiştir. 

Anahtar Kelimeler

Veri Gizleme, Damgalama, Görsel Sır Paylaşımı, Adli Bilişim, Kriptolojik Özet Fonksiyonları, Bilgi Güvenliği, Görüntü İşleme

Kaynakça

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