安全问题是无线通信系统发展的关键问题之一,而无线通信因其开放性和广播性,极易受到窃听和干扰等安全威胁。传统的安全保障是通过物理层以上的密码技术实现的,而物理层缺少有效的安全措施。从物理层信号结构设计出发,利用传输信息本身...安全问题是无线通信系统发展的关键问题之一,而无线通信因其开放性和广播性,极易受到窃听和干扰等安全威胁。传统的安全保障是通过物理层以上的密码技术实现的,而物理层缺少有效的安全措施。从物理层信号结构设计出发,利用传输信息本身的随机性,提出消息驱动调制方式加密算法和循环前缀(Cyclic Prefix,CP)随机化算法。仿真分析表明,本设计保持良好的误码特性的同时,有效的消除信号的二阶循环相关特征,信号具有低截获(Low Probability of Pntercepted,LPI)特性。展开更多
Replacement and substitution encryption are two basic types of encryption historically. The classical encryption algorithm has been compromised now, but they still can play special role for modem cryptnlogy. For examp...Replacement and substitution encryption are two basic types of encryption historically. The classical encryption algorithm has been compromised now, but they still can play special role for modem cryptnlogy. For example, in digital image encryption system, substitution can disrupt the original order of the images and eliminate the correlation of image information which not only can realize security of images, but also can resist intentional attack and destruction of clipping and noise. And transposition transformation is introduced into the design of block ciphers. The substitution has the feature of high efficiency and resistance, which makes it meet the specific requirements of encryption. So substitution cypher can be applied to modern encryption system.展开更多
文摘安全问题是无线通信系统发展的关键问题之一,而无线通信因其开放性和广播性,极易受到窃听和干扰等安全威胁。传统的安全保障是通过物理层以上的密码技术实现的,而物理层缺少有效的安全措施。从物理层信号结构设计出发,利用传输信息本身的随机性,提出消息驱动调制方式加密算法和循环前缀(Cyclic Prefix,CP)随机化算法。仿真分析表明,本设计保持良好的误码特性的同时,有效的消除信号的二阶循环相关特征,信号具有低截获(Low Probability of Pntercepted,LPI)特性。
文摘Replacement and substitution encryption are two basic types of encryption historically. The classical encryption algorithm has been compromised now, but they still can play special role for modem cryptnlogy. For example, in digital image encryption system, substitution can disrupt the original order of the images and eliminate the correlation of image information which not only can realize security of images, but also can resist intentional attack and destruction of clipping and noise. And transposition transformation is introduced into the design of block ciphers. The substitution has the feature of high efficiency and resistance, which makes it meet the specific requirements of encryption. So substitution cypher can be applied to modern encryption system.
