Research and Realization of SIP UA with Security Based on Linux Environment

随着因特网商业化革命和网络技术的不断发展，融合了数据、视频、音频业务的多媒体通信业务得到了飞速的发展，并将成为下一代网络NGN的主流业务之一。软交换作为NGN网络的核心单元，成为人们研究与应用的热点。 因为简单、灵活和易扩展等特点，SIP将在3GPP中得到广泛应用。但是SIP本身缺少有力的安全机制使其面临很多安全威胁，因此SIP的安全机制也成为目前的研究热点之一。 本文首先对SIP通信的网络架构、消息结构、注册和会话管理过程进行研究。对系统需求进行分析设计，利用oSIP和eXosip协议栈，在Linux下实现了一个功能比较全面的IP电话软件。 另外，本文对SIP中的安全问题和安全性要求进...With the commercial revolution of Internet and the continuous development of the network technology, the multimedia communication services, which combine the audio, video, and data together, have been developed rapidly, and get ready to become one of the main business of Next Generation Network. As the core unit of NGN, soft switch became a hot issue of recent researches and applications. SIP...学位：工学硕士院系专业：信息科学与技术学院计算机科学系_计算机系统结构学号：2302006115242

Research on Identity-Based Authentication in SIP

因为简单、灵活和易扩展等特点,SIP将在3gPP中得到广泛应用,但是SIP本身缺少有力的安全机制使其面临很多安全威胁。文中对SIP中的安全问题和安全性要求进行分析,为了解决SIP中认证和消息加密的问题,把基于身份认证这种结构简单、应用容易的安全机制引入到SIP协议中,提出了一种新的认证加密方法。采用基于身份的加密机制使系统初始化简单,不需要繁琐的密钥协商步骤,并且维护容易。同时满足了SIP的安全要求,保证了会话建立和消息通信过程中的完整性、可靠性和不可抵赖性。SIP will be widely applied in 3GPP,because of its simplicity,flexibility and scalability.But a lack of powerful security mechanism,lead it to face many security threats.In this paper,analyse the issues existed and the requirements needed in SIP security mechanism.In order to solve the problems in SIP authentication and information encryption,proposed a new method about authentication by involving identity-based encryption,a security mechanism which has simple architecture and is easy to apply,to the SIP security mechanism.It makes the construction of the system easier.There is no need of complex steps about key agreement,and it is easy to maintain.At the same time it meets the safety requirements of SIP to ensure that the integrity,reliability and incontestability in the process of session establishment and messaging conversation.福建省2004年自然科学基金(A0410004);厦门大学院士基金(0630-E23011);厦门大学新世纪优秀人才基金(0000-X07116

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies