ANALISIS KINERJA ALGORITMA RSA DALAM PENGACAKAN CITRA WATERMARK PADA IMAGEWATERMARKING MENGGUNAKAN TRANSFORMASI WAVELET PERFORMANCE ANALYSIS OF RSA ALGORITHM IN IMAGE WATERMARK RANDOMIZATION APPLIED ON IMAGEWATERMARKING USING WAVELET TRANSFORMATION

ABSTRAKSI: Seiring dengan perkembangan zaman dan semakin meluasnya jaringan multimedia, maka proses pengiriman dan pengaksesan citra digital juga semakin mudah. Kemudahan ini membuat setiap orang dapat secara bebas saling bertukar informasi yang mereka inginkan sehingga diperlukan suatu sistem perlindungan terhadap data tersebut. Perlindungan data pada sistem digital dapat berupa metoda criptography dan metode watermarking. Metoda criptography yaitu metoda pengacakan data menjadi chipertext menggunakan suatu kunci criptography. Criptography memusatkan kepada keamanan saat proses penditribusian data. Metode watermarking merupakan metode yang menyisipkan data dengan suatu data watermark. Watermarking memusatkan pada perlindungan hak cipta data tersebut. Tugas Akhir ini bertujuan mengembangkan sistem image watermarking menggunakan transformasi wavelet Haar level satu. Algoritma RSA yang merupakan salah satu kunci pada criptography digunakan sebagai pengacak data watermark yang berupa citra dan Independent Component Analysis sebagai pengekstraksian watermark. Algoritma RSA mendasarkan proses enkripsi dan dekripsinya pada konsep bilangan prima dan aritmetika modulo sehingga diharapkan citra watermark tidak mudah dideteksi dan keamanan data watermark dapat ditingkatkan. Parameter yang mempengaruhi kinerja sistem image watermarking dengan pengacakan citra watermark menggunakan Algoritma RSA yaitu mean square error (MSE) dan mean opinion score (MOS). Hasil simulasi sistem image watermarking dengan Algoritma RSA menghasilkan nilai MSE 1.48*10-14% untuk image watermarking tanpa gangguan noise. Uji kehandalan dari skema watermarking ini dilakukan dengan memberi gangguan derau, kompresi JPEG, dan rescaling pada citra watermark. Berdasarkan hasil uji simulasi dapat diketahui nilai MSE saat diberi noise uniform adalah 13.9176%, untuk kompresi JPEG 42.9841%, dan 42.6666% untuk rescaling.Kata Kunci : ABSTRACT: Delivering and accessing process of digital image is easier in line with the developing era and the multimedia network that gets wider. The benefit has made people change information they want freely, so that a protection system of datas needed. Data protection of digital system can be criptography and watermarking method. Criptography method is a method used to randomize data become chipertext using a criptography key. Criptography is focused on the security during the data’s distribution process. Watermarking method is a method used to insert data with a watermark data. Watermarking focused on the protection of copyright data. The objective of the Final Project is to develop a watermarking image system using a level one Haar Wavelet transformation. RSA Algorithm is one of keys on criptography used to randomize watermark data such as image and Independent Component Analysis as watermark extraction. RSA Algorithm which encryption and decryption process are based on prime number and aritmatic module so it is expected that watermark image is not easily detected and the security of watermark data can be improved. The important parameter affecting perpormance image watermarking system is mean square error (MSE) and mean opinion score (MOS). From simulation of image watermarking with randomizing watermark image using RSA Algorithm resulted MSE 1.48*10-14% for image watermarking without noise distortion. Reliability test of this watermarking scheme is done by giving noise, JPEG compression and rescaling in watermark image. Based on result simulation can be known MSE value when given noise uniform is 13.9176%, for JPEG compression 42.9841%, and 42.6666% for rescaling.Keyword

Spread spectrum-based video watermarking algorithms for copyright protection

Merged with duplicate record 10026.1/2263 on 14.03.2017 by CS (TIS)Digital technologies know an unprecedented expansion in the last years. The consumer can now benefit from hardware and software which was considered state-of-the-art several years ago. The advantages offered by the digital technologies are major but the same digital technology opens the door for unlimited piracy. Copying an analogue VCR tape was certainly possible and relatively easy, in spite of various forms of protection, but due to the analogue environment, the subsequent copies had an inherent loss in quality. This was a natural way of limiting the multiple copying of a video material. With digital technology, this barrier disappears, being possible to make as many copies as desired, without any loss in quality whatsoever. Digital watermarking is one of the best available tools for fighting this threat. The aim of the present work was to develop a digital watermarking system compliant with the recommendations drawn by the EBU, for video broadcast monitoring. Since the watermark can be inserted in either spatial domain or transform domain, this aspect was investigated and led to the conclusion that wavelet transform is one of the best solutions available. Since watermarking is not an easy task, especially considering the robustness under various attacks several techniques were employed in order to increase the capacity/robustness of the system: spread-spectrum and modulation techniques to cast the watermark, powerful error correction to protect the mark, human visual models to insert a robust mark and to ensure its invisibility. The combination of these methods led to a major improvement, but yet the system wasn't robust to several important geometrical attacks. In order to achieve this last milestone, the system uses two distinct watermarks: a spatial domain reference watermark and the main watermark embedded in the wavelet domain. By using this reference watermark and techniques specific to image registration, the system is able to determine the parameters of the attack and revert it. Once the attack was reverted, the main watermark is recovered. The final result is a high capacity, blind DWr-based video watermarking system, robust to a wide range of attacks.BBC Research & Developmen

Print-Scan Resilient Text Image Watermarking Based on Stroke Direction Modulation for Chinese Document Authentication

Print-scan resilient watermarking has emerged as an attractive way for document security. This paper proposes an stroke direction modulation technique for watermarking in Chinese text images. The watermark produced by the idea offers robustness to print-photocopy-scan, yet provides relatively high embedding capacity without losing the transparency. During the embedding phase, the angle of rotatable strokes are quantized to embed the bits. This requires several stages of preprocessing, including stroke generation, junction searching, rotatable stroke decision and character partition. Moreover, shuffling is applied to equalize the uneven embedding capacity. For the data detection, denoising and deskewing mechanisms are used to compensate for the distortions induced by hardcopy. Experimental results show that our technique attains high detection accuracy against distortions resulting from print-scan operations, good quality photocopies and benign attacks in accord with the future goal of soft authentication

Fast watermarking of MPEG-1/2 streams using compressed-domain perceptual embedding and a generalized correlator detector

A novel technique is proposed for watermarking of MPEG-1 and MPEG-2 compressed video streams. The proposed scheme is applied directly in the domain of MPEG-1 system streams and MPEG-2 program streams (multiplexed streams). Perceptual models are used during the embedding process in order to avoid degradation of the video quality. The watermark is detected without the use of the original video sequence. A modified correlation-based detector is introduced that applies nonlinear preprocessing before correlation. Experimental evaluation demonstrates that the proposed scheme is able to withstand several common attacks. The resulting watermarking system is very fast and therefore suitable for copyright protection of compressed video

Optimal Radiometric Calibration for Camera-Display Communication

We present a novel method for communicating between a camera and display by embedding and recovering hidden and dynamic information within a displayed image. A handheld camera pointed at the display can receive not only the display image, but also the underlying message. These active scenes are fundamentally different from traditional passive scenes like QR codes because image formation is based on display emittance, not surface reflectance. Detecting and decoding the message requires careful photometric modeling for computational message recovery. Unlike standard watermarking and steganography methods that lie outside the domain of computer vision, our message recovery algorithm uses illumination to optically communicate hidden messages in real world scenes. The key innovation of our approach is an algorithm that performs simultaneous radiometric calibration and message recovery in one convex optimization problem. By modeling the photometry of the system using a camera-display transfer function (CDTF), we derive a physics-based kernel function for support vector machine classification. We demonstrate that our method of optimal online radiometric calibration (OORC) leads to an efficient and robust algorithm for computational messaging between nine commercial cameras and displays.Comment: 10 pages, Submitted to CVPR 201