Keywords : SNR


Use the Frequency Domain to Hide in Some Audio Files

Zahraa Tarik; Farah T. Mohammd; Ikhlass Thanoon; Azhar Rafie

AL-Rafidain Journal of Computer Sciences and Mathematics, 2013, Volume 10, Issue 1, Pages 275-284
DOI: 10.33899/csmj.2013.163458

In this work, anew hiding algorithm is proposed that depends on using two deferent domain (spatial and frequency) to achieve and provide security and protection for transformed data, which is represented in a text message encrypted using a key of direct standard method, then spatial domain were use to hide it inside an audio file, Using Discrete cosine transform (DCT) this file has been hidden inside a host audio file. The data of the text message has been fully retrieved after decrypting process, the value of normalization correlation is equal to one.
 

Digital Information Hiding Techniques

Alyaa Moufaq Abdul Majeed Haleem; Nadia M. Mohammed

AL-Rafidain Journal of Computer Sciences and Mathematics, 2010, Volume 7, Issue 3, Pages 109-120
DOI: 10.33899/csmj.2010.163916

Information hiding, a form of watermark, embeds data into digital media for the purpose of identification and copyright. Several constraints affect this process: the size of data to be hidden, the need for robustness of these data under conditions where a host_signal is subject to distortions, for e.g., lossy_compression, and the degree to which the data must be immune to interception, modification, or removal by a third person.
Here, we explore two techniques (DC watermarking scheme and Time Domain watermarking technique) for addressing the data-hiding process and evaluate these techniques in light of the copyright protection application. The measures (SNR, PSNR, NRMSE) were used to improve the results. Besides that the Matlab were used as a programming language in this paper.