查看更多>>摘要:Network is one of the 20th century after the invention of the contribution of the greatest human society,most far-reaching.The impact of social networks on the transmission of information beyond the means of any past era,this article from the perspective of network attack and defense,protocol and security solutions to elaborate network protocol security.Focus on vulnerabilities and prevention strategies in the physical network layer of wireless networks,and the real experiment.
查看更多>>摘要:Copy-move is a common forgery in the research field of digital image forensics.The existing algorithms on copy-move detecting are quite computationally expensive and low operating efficiency for lexicographically order.In order to overcome the drawback,an autocorrelation detection methods based on the discrete wavelet transform is proposed in this paper.In this method,low-frequency sub-band wavelet decomposition which is best approximation of the image is extracted as a feature vector and calculate their Pearson correlation coefficient to detect the similar blocks.The experiments demonstrate that the proposed approach can greatly reduce the dimension of feature vector and accordingly increased detection efficiency of the matching block.