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Recently, a modified data hiding scheme based on pixel value differencing and improving exploiting modification directions is proposed by Shen and Huang. There are two major contributions in this scheme. One is to enhance the embedding rate and good embedding capacity and the other is an optimization problem used to solve the overflow/ underflow problem. In fact, they propose the similar brute force...
With the growing popularity of network applications, multi-server architectures are becoming an essential part of heterogeneous networks and numerous security mechanisms have been widely studied in recent years. To protect sensitive information and restrict the access of precious services for legal privileged users only, smart card and biometrics based password authentication schemes have been widely...
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