基于跳频的改进加权分数阶傅里叶变换

为提高4项加权分数阶傅里叶变换(WFRFT)的安全性能,提出了一种基于跳频的改进加权分数阶傅里叶变换.通过子载波跳频的方法打乱传统WFRFT中离散傅里叶变换(DFT)矩阵列的顺序,从而使加权傅里叶变换矩阵的周期以及加权系数的周期在跳频序列的影响下呈现多样性,提高其抗截获的性能.仿真结果表明:改进后的FH-WFRFT能够在参数信息被窃听方获取的情况下保护传输信息的安全,相比传统的WFRFT具有更好的抗截获性能.     

基于OpenSSL的SSL协议实现研究

一、SSL（安全套接字层）协议概述 随着网络及其各种信息服务的迅猛发展，引发了诸多的安全威胁，并且造成了巨大的损失。因此，为通信提供更强大的安全性已成为必需之举。通信安全的中心内容就是保证信息在信道内的保密性、消息完整性和可认证性。     

数字通电话密码系统“可以被摧毁”

密码分析学家声称，曾经保护数字通(GSM)电话用户免受即时监听和欺骗的加密，现在已经不再那么坚不可摧了。     

计算机网络安全的几项关键技术

本文通过网络安全的威胁因素，阐述了局部域网、广域网的安全技术，着重说明了防火墙技术。     

Another ID-Based Proxy Signature Scheme and Its Extension

So fur, the security of many proxy signatures has seldom been considered in a formal way and most of them cannot satisfy nonepudiation. In this work, a novel ID-based （Identity-based） proxy signature scheme is proposed by combining the proxy signature with ID-based public cryptography, and they formalize the notion of security for ID-based proxy signature schemes. And show that the security of the proposed scheme is secure. Compured with other proxy signature schemes, it does not need a secure channel. Thus, it is particularly suitable for the unreliable network computation environment. Finally, they extend proposed scheme to a proxy multi-signature which has the following advantages （1） the size of proxy multi- signature is independent of the number of delegating users; （2） the computation cost of proxy multi-signature only need two Weil paring.     

Linear-Differential Cryptanalysis for SPN Cipher Structure and AES

0 Introduction Substitution and permutation network (SPN) structure is one of the most widely used structures in block ciphers. The SPN structure is based on Shannon’s principles of confusion and diffusion[1] and these principles are implemented through …