Increasing the resilience of the method of protection to ensure the authenticity of raster images of the evidence base from unauthorized access.

• Date: 2019
• Main Authors: Pavlenko, B. V., Prysiazhnyi, D. P., Karpinets, V. V., Yaremchuk, Y. Y.
• Format: Article
• Language: Ukrainian
• Published: Інститут проблем реєстрації інформації НАН України 2019
• Subjects: information security; steganography; digital watermarks; the least significant bit rep-lacement method; Kutter-Jordan-Bossen method; Lengelaar method; Koch-Zhao method
• Online Access: http://drsp.ipri.kiev.ua/article/view/179058
• Journal Title: Data Recording, Storage & Processing

A method of authentication of digital images for the evidence base of the judicial system and developed the appropriate software has been proposed. The stability of existing steganographic methods for ensuring the authenticity of images is analyzed and the possibility of modifying the method is examined. As a result, the method of embedding CEH based on the Koch-Zhao method is chosen for modification. After analysing the proposed method to the set of attacks, it can be noted that the method has a high resistance to passive attacks and, unlike most methods, has high resistance to active attacks by the attacker, which is shown in the results of filter testing, cropping, rotation of the image.The obtained improved method of embedding a CEH allowed to significantly increase the resistance to unauthorized modifications, the results indicate a high level of resistance. An algorithm for the implementation of an improved method has been developed, and its software implementation has been implemented. A study of the stability of the proposed method to unauthorized modifications of digital images has been conducted. Overall, the results indicate a high level of stability, the modified method of embedding generates high-quality images with a high PSNR of 39 to 47,7 decibels when testing conventional images, and 40,6 to 51 decibels when using document shots. The worst results have been obtained by using the «salt and pepper» noise attack, which led to 14,28 % of mistakenly read bits. Tabl.: 1. Fig.: 4. Refs: 13 titles.