一个无线双向认证和密钥协商协议

身份认证和密钥协商是无线通信中一个非常重要的安全问题.本文提出了一个无线双向认证和密钥协商协议,解决了无线通信中的身份认证和密钥协商问题,并使移动网络系统向移动用户提供匿名服务,使得访问网络与非法窃听者无法获知用户的身份信息,保证了用户身份信息和所在位置信息的机密性,高效实用.

Based HVS Chaotic Array Image Watermarking Algorithm

In this paper,we present a novel HVS based visual masking and self adaptive image public watermarking using chaotic array,and define a new noisesensitivity using forth order cumulant in visual masking.In this algorithm,chaotic array is embedded to the sub low frequency coefficients of the block DCT,then visual masking is made according to the noisesensitivity.Under the affect of noisesensitivity,Visual masking accomplish self adaptive controllable intensity of watermark.Without original image,we can remarkably detect the existence of watermark by public key.With common signal distortion or geometric distortion (such as lossy compress,cropping etc.),watermark can achieve better robust.