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1.
通过密码算法和密码协议,初步介绍SSL协议。然后通过公开源代码库的OpenSSL协议的具体实现,使大家更加深入的理解SSL协议。  相似文献   

2.
Ethereal是一个UNIX和类UNIX操作系统下的基于图形用户接口库GTK+和包捕获、过滤库Libpcap(Windows平台下使用Winpcap库)的网络协议分析器或嗅探器。它具有很好的跨平台捕获性能,且支持第三方插件。详细阐述了在Windows平台下开发Ethereal插件的方法,并结合CORBA协议解析器的生成实例介绍了其实现技术。  相似文献   

3.
本文分析了入侵检测系统Snort的特征库的结构和建立,实现了一种特征库的实时动态更新技术。该技术方法利用规则库构建特征库,作为第二特征库,通过实时切换技术,实现将第二特征库转为第一特征库,从而达到协议特征库动态更新的目的。  相似文献   

4.
RSVP协议在具有QoS保证的应用程序实现中的复杂性成为RSVP协议应用到流媒体系统中的一个瓶颈.提出一种在基于Windows平台的流媒体系统中引入RSVP协议的实现方法,此方法在实现了RTP/RTCP协议的流媒体系统基础上,不必修改源码,通过一种RLR(RSVP library redirection,RSVP库重定向)方法,结合微软Winsock2中的常规服务质量(generic quality of service,GQoS)技术,为流媒体预留带宽.  相似文献   

5.
张静  罗宇 《计算机工程》1999,25(3):44-46,68
ULC是专为计算机群机计算而实现的用户层通信库。它在用户层提供了一个多用户,多线路的通信库,在用户层完成消息多路复用。多协议处理,硬件及关键区互销机制。  相似文献   

6.
针对新兴电子商务网站首选开放的XMPP协议作为IM系统的需求,分析XMPP、BOSH协议及技术特点,给出Web IM系统总体架构设计,并选择Strophe.js库对Web IM系统客户端进行详细的设计与实现。  相似文献   

7.
针对当前网络协议识别面临的网络带宽持续增加、许多新应用的出现和端口识别局限性的挑战,分析各种识别方法所使用的协议指纹存在的基础、局限性和匹配的难易程度,提出一种基于协议指纹匹配和协议规则验证的协议自识别技术实现协议自识别方法,通过提取不同网络协议类型之间的细微差别,建立网络应用协议指纹特征库,并通过协议验证规则验证协议识别结果的正确性。最后通过实验表明该方法的有效性。  相似文献   

8.
Bi-PIM协议的原理分析及其Petri网模型   总被引:1,自引:0,他引:1  
陆正福  王敏 《计算机工程》2004,30(2):124-126
文章在对Bi-PIM协议的机制进行分析的基础上,用扩展的库所/变迁网对其进行形式化的建模,为其具体分析和实现奠定了形式化和自动化的基础。  相似文献   

9.
SSL是在互联网上提供安全通讯的密码学协议。在分析SSL协议和中间人攻击原理的基础上,利用OpenSSL开发库实现了中间人攻击,包括会话劫持、公钥证书的伪造和数据的转发,为用户安全使用SSL协议提供了建议和参考。  相似文献   

10.
基于SSL协议的SET协议模拟实现   总被引:4,自引:0,他引:4  
安全问题是关系到电子商务服务是否能够广泛开展的重要因素。一个安全电子支付系统需要特殊的安全机制。目前,在电子商务中使用的安全协议主要有两种,即SSL协议和SET协议。SSL协议是免费的,但是它有重大缺陷。SET协议要安全许多,然而却非常昂贵,且现有的实现缺乏灵活性。SSL协议的实现版本openssl里附带有一个非常完备的加密函数库和一整套的使用和管理CA数字证书的方法。主要讨论如何在SSL协议的基础上利用openssl开发包和组件技术来实现SET协议功能,并提高SET协议使用的灵活性。  相似文献   

11.
用户级通信协议BCL-3对IP协议支持的研究   总被引:2,自引:0,他引:2       下载免费PDF全文
陈志辉  马捷  陈国良  高帆 《软件学报》2003,14(9):1629-1634
为了充分利用高性能网络,研究人员开发了多种用户级通信协议.这些用户级通信协议可以获得底层硬件提供的高带宽、低延迟.然而由于它们提供完全不同的应用程序接口,用户级通信协议往往只能支持科学计算,而不能支持传统的基于Socket接口、采用核心级通信协议的网络应用程序.通过增加一个IP协议支持模块,BCL-3用户级通信协议在支持科学计算的同时,可以有效地支持现有的基于TCP/IP协议的网络应用程序.而且在分析TCP/IP协议软件开销的基础上,IP协议支持模块有针对性地采用了一些优化技术,使运行在BCL-3上的TCP/IP协议可以取得很高的网络性能.改进的BCL-3已经运行在曙光3000L超级服务器上.在曙光3000L上,运行于BCL-3之上的TCP/IP协议取得了最大带宽938Mbps,最小单向延迟48.1μs的性能.  相似文献   

12.
Distributed active storage architectures are designed to offload user-level processing to the peripheral from the host servers. In this paper, we report preliminary investigation on performance and fault recovery designs, as impacted by emerging storage interconnect protocols and state-of-the-art storage devices. Empirical results obtained using validated device-level and interconnect data demonstrate the significance of the said parameters on the overall system performance and reliability.  相似文献   

13.
作为一款高性能的嵌入式互联协议,RapidIO支持RDMA操作以获得高性能.目前,针对RapidIO通信接口只有以太网模拟器,这种实现机制限制了RapidIO通信性能的发挥.参考国内外基于RDMA的通信协议实现方法,并结合RapidIO互联协议的特点,提出了一套基于RDMA技术的RapidIO用户态通信接口实现方法.在此基础上,验证了通信接口的性能并对实现方案进行了多种优化.经比较,实现的RapidIO通信接口数据吞吐量是目前所有已知的RapidIO通信接口中最高的.  相似文献   

14.
On Dawning-1000,the two-dimension mesh interconnection network enables low-latency,high-bandwidth communication,however,these capabilities have not been realized because of the high processing overhead imposed by existing communication software.Active Messages provide an efficient communication mechanism with small overhead,which may expose the raw capabilities of the underlying hardware.In addition,one of the most promising techniques,use-level communication,is often used to improve the performance of the traditional protocols such as TCP and UDP,and is also adopted in implementing the novel abstractions like Active Messages.Thus a user-level Active Messages model is designed and implemented on Dawning-1000.Preliminary experiments show that the combination of Active Messages mechanism and user-level communication technique is quite efficient in reducing software overhead associated with sending and receiving messages,and in exploiting the capabilities of the interconnection network.  相似文献   

15.
Technological advances in network and processor speeds do not lead to equally large improvements in the performance of client-server systems. For instance, hardware performance improvements do not translate into faster user applications. This is primarily because software overhead dominates communication. The Shrimp project at Princeton University seeks solutions to this problem. Shrimp (Scalable High-Performance Really Inexpensive Multiprocessor) supports protected user-level communication between processes by mapping memory pages between virtual address spaces. This virtual memory-mapped network interface has several advantages, including flexible user-level communication and very low overhead for initiating data transfers. Here, we examine two remote procedure call (RPC) protocols and one socket implementation for Shrimp that deliver almost undiminished hardware performance to user applications  相似文献   

16.
This paper presents the design and implementation of a user-level real-time network system in Real-Time Mach. Traditional network systems for microkernel based operating systems, which tend to focus on high performance and flexibility, are not suitable for real-time communication. Our network system provides a framework for implementing real-time network protocols which require to bound protocol processing time, and it is suitable for implementing on microkernel based operating systems. In this paper, we especially focus on the aspects to avoid the priority inversion problem in order to make network systems more preemptable and predictable. We also describe the feasibility of our network system for building distributed multimedia systems.  相似文献   

17.
User-Level Device Drivers: Achieved Performance   总被引:2,自引:0,他引:2       下载免费PDF全文
Running device drivers as unprivileged user-level code, encapsulated into their own process, has often been proposed as a technique for increasing system robustness. However, in the past, systems based on user-level drivers have generally exhibited poor I/O performance. Consequently, user-level device drivers have never caught on to any significant degree. In this paper we demonstrate that it is possible to build systems which employ user-level device drivers, without significant performance degradation, even for high-bandwidth devices such as Gigabit Ethernet.  相似文献   

18.
针对传统属性基加密方案中单授权中心计算开销大以及安全性较差等问题,通过引入多个授权中心以及安全两方计算协议等技术,提出一种支持细粒度属性级撤销和用户级撤销的密文策略属性基加密方案。引入多个属性授权中心以颁发并更新属性版本秘钥,同时秘钥生成中心与云存储服务器之间进行安全两方计算等操作,生成并更新用户密钥,从而进行细粒度属性级撤销。在云存储服务器中,对用户列表中的用户唯一秘值及唯一身份值进行操作以实现用户级撤销,同时通过多个授权中心抵抗合谋攻击,并将部分计算工作外包给云端。分析结果表明,与基于AND、访问树和LSSS策略的方案相比,该方案有效增强了系统的安全功能,同时显著降低了系统的计算复杂度。  相似文献   

19.
高速邮件监控审计研究   总被引:1,自引:0,他引:1  
为了满足企业级高速网络中邮件监控需求,提出了基于内存映射和libnids改进框架的邮件监控审计方案.该方案首先通过改进libnids库内核、用户级缓存和内存映射文件技术减小I/O开销,高效捕获存、储原始邮件数据,然后对邮件协议进行了深入地分析,将捕获的数据简化封装成MIME格式,采用多线程技术对其进行还原,最后采用基于Wu_Manber多模式匹配算法对还原的邮件内容进行审计,生成强大的审计报表.测试结果表明,该系统能为企业管理部门提供一个高效的邮件监管工具.  相似文献   

20.
This paper presents executable use cases (EUCs), which constitute a model-based approach to requirements engineering. EUCs may be used as a supplement to model-driven development (MDD) and can describe and link user-level requirements and more technical software specifications. In MDD, user-level requirements are not always explicitly described, since usually it is sufficient that one provides a specification, or platform-independent model, of the software that is to be developed. Therefore, a combination of EUCs and MDD may have potential to cover the path from user-level requirements via specifications to implementations of computer-based systems.  相似文献   

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